Patent Grant
9140844
The present invention relates to the technical field of optical components including nanoparticles, systems including optical components including nanoparticles, and devices including optical components including nanoparticles.
The present invention relates to an optical component and to a lighting system including a light source and an optical component that is optically coupled to receive at least a portion of light emitted from the light source, such that the optical component converts a portion of the light received by the optical component to a predetermined wavelength to alter at least one characteristic of light output emitted from the lighting system. The present invention also relates to devices including a lighting system of the invention.
In accordance with certain embodiments of the invention, there is provided an optical component. The optical component preferably comprises a light guide plate and an optical material disposed over at least a portion of a surface of the light guide plate, the optical material comprising quantum confined semiconductor nanoparticles capable of emitting light in a predetermined spectral region. In certain embodiments, the optical material includes quantum confined semiconductor nanoparticles in an amount effective to receive and convert from about 1 to about 50% of light emitted from the light source. In certain embodiments, the optical material includes quantum confined semiconductor nanoparticles in an amount effective to receive and convert from about 1 to about 90% of light emitted from the light source. In certain embodiments, the optical material further comprises a host material. In certain embodiments, the host material is optically transparent. In certain embodiments, the nanoparticles are dispersed in the host material. In certain embodiments, the nanoparticles are uniformly dispersed in the host material. In certain embodiments, the optical material is disposed on a predetermined area of a surface of the light guide plate. In certain embodiments, the light guide plate is optically transparent. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material. In certain embodiments, the optical material is sandwiched between two light guide plates.
Optical components in accordance with various aspects and embodiments of the invention can be useful with a white LED light source.
In accordance with certain embodiments of the present invention, there is provided a lighting system comprising a light source capable of generating light, and an optical component optically coupled to receive at least a portion of the light generated by the light source and convert at least a portion of the light so received to a predetermined wavelength such that the light emitted by the lighting system includes light emission from the light source supplemented with light emission at the predetermined wavelength, wherein the optical component including an optical material comprises quantum confined semiconductor nanoparticles.
In certain embodiments, the optical component further includes a light guide plate. In certain embodiments, the light guide plate is optically transparent. In certain embodiments, optical material is disposed on a predetermined area of a surface of the light guide plate. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material. In certain embodiments, the optical material comprises quantum confined semiconductor nanoparticles having compositions selected to convert at least a portion of the light received from the light source to light emission having a predetermined wavelength.
In certain embodiments, the optical material is not in direct contact with the light source. Preferably the temperature at the location of the nanoparticles during operation of the lighting system is less than 90° C., more preferably less than 75° C., and most preferably 60° C. or less.
A lighting system in accordance with certain embodiments of the present invention can be useful as a backlight unit (BLU) for a liquid crystal device (LCD), including but not limited to LCD BLUs for various mobile applications, including but not limited to, cell phones, computers, GPS navigational devices, portable video devices, and other portable devices including displays.
In certain embodiments, the light source comprises a white LED (e.g., a blue emitting semiconductor LED that is encapsulated with an encapsulant including phosphor material (e.g., typically a yellow phosphor material) for converting the blue LED light output to white), and the optical component comprises an optical material comprising quantum confined semiconductor nanoparticles capable of emitting red light.
In certain embodiments, the optical component comprises a light guide plate and an optical material disposed on a predetermined area of a surface of the light guide plate, wherein the optical material comprises quantum confined semiconductor nanoparticles. In certain embodiments, the light guide plate is optically transparent. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material.
In certain embodiments, the host material is optically transparent. In certain embodiments, the nanoparticles are dispersed in the host material. In certain embodiments, the nanoparticles are uniformly dispersed in the host material. In certain embodiments, the optical material disposed on at least a portion of one of the major surfaces of the light guide plate. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material.
In certain embodiments of a lighting system in accordance with the invention that include, e.g., a light source comprising a white LED and an optical component comprising red-emitting quantum confined semiconductor nanoparticles, a red emission component is added to the light output of the lighting system. The addition of the red emission component can improve the useful front-screen power of the lighting system without increasing the power requirements thereof. For example, in such embodiments, using red-emitting quantum confined semiconductor nanoparticles to down convert the white (blue plus yellow phosphor) light from a typical LED can generate a greater quantity of useful front of screen luminance than can be achieved without the additional red emitting material. For a fixed amount of input electrical power, more useful optical power may be produced, or alternatively for the same front of screen brightness, less electrical power would need to be consumed from the power source.
In certain embodiments, a lighting system comprises a light source comprising an LED capable of emitting white light, the white light emission with a color deficiency in the red spectral region; and an optical component optically coupled to receive at least a portion of the light emitted by the LED, the optical component comprising an optical material comprising quantum confined semiconductor nanoparticles having compositions selected to convert at least a portion of the light received from the LED to light in the red spectral region, such that the light emitted by the lighting system includes white light emission from the LED light source supplemented with light emission in the red spectral region.
In certain embodiments, the optical component includes a light guide plate and an optical material disposed over a predetermined area of a surface of the light guide plate, the optical material comprising an effective amount of quantum confined semiconductor nanoparticles having compositions selected to convert at least a portion of light coupled to the light guide plate from the LED to light in the red spectral region.
In certain embodiments, the light source comprises a blue emitting LED including a yellow phosphor in an encapsulant on or otherwise optically coupled to the LED for generating white light.
In certain embodiments, the optical material is spaced from the light source. Preferably the temperature at the location of the nanoparticles in an operating lighting system is less than 90° C., more preferably less than 75° C., and most preferably 60° C. or less.
In certain embodiments, the optical material comprises quantum confined semiconductor nanoparticles that are capable of emitting light with a wavelength in the red region of the spectrum.
In certain embodiments, the optical material comprises quantum confined semiconductor nanoparticles have a solid state quantum efficiency of at least about 35%.
In certain embodiments and aspects of the inventions described herein, the quantum confined semiconductor nanoparticles have an average particle size in a range from about 1 to about 100 nanometers (nm). In certain embodiments, the quantum confined nanoparticles have an average particle size in a range from about 1 to about 20 nm. In certain embodiments, the quantum confined semiconductor nanoparticles have an average particle size in a range from about 2 to about 10 nm.
Preferably, ligands are attached to a surface of at least a portion of the quantum confined semiconductor nanoparticles.
In certain embodiments and aspects of the inventions described herein including quantum confined semiconductor nanoparticles, at least a portion of the quantum confined semiconductor nanoparticles are capable of converting the wavelength of at least a portion of light coupled into the light guide plate from a light source to one or more predetermined wavelengths.
In certain embodiments and aspects of the inventions described herein including quantum confined semiconductor nanoparticles, the quantum confined semiconductor nanoparticles comprise semiconductor nanocrystals. In certain embodiments the quantum confined semiconductor nanoparticles comprise semiconductor nanocrystals including a core/shell structure.
In certain aspects and embodiments of the invention described herein, quantum confined semiconductor nanoparticles comprise semiconductor nanocrystals wherein at least a portion of the semiconductor nanocrystals include one or more ligands attached to a surface thereof.
In certain aspects and embodiments of the invention described herein, an optical component does not include phosphor particles.
In certain preferred embodiments and aspects of the inventions described herein including a light guide plate, the light guide plate is transparent to light coupled to the light guide plate from a light source and to light emitted by the quantum confined semiconductor nanoparticles.
In certain embodiments and aspects of the inventions described herein including a light guide plate, the light guide plate can comprise a rigid material, e.g., glass, polycarbonate, thick acrylic, quartz, sapphire, or other known rigid materials with light guide plate characteristics.
In certain embodiments and aspects of the inventions described herein including a light guide plate, the light guide plates can alternatively comprise a flexible material, e.g., a polymeric material such as plastic or silicone (e.g. but not limited to thin acrylic, epoxy, PEN, PET, PE).
In certain embodiments and aspects of the inventions described herein including a light guide plate, the light guide plate is planar.
In certain embodiments and aspects of the inventions described herein including a light guide plates, at least the texture of the surface of the light guide plate from which light is emitted is selected to enhance or otherwise alter the pattern, angle, or other feature of light transmitted therethrough. For example, in certain embodiments, the surface may be smooth; in certain embodiments, the surface may be non-smooth (e.g., the surface is roughened or the surface includes one or more raised and/or depressed features); in certain embodiments, the surface may include both smooth and non-smooth regions.
In certain embodiments and aspects of the inventions described herein, the geometrical shape and dimensions of a light guide plate and/or an optical component can be selected based on the particular end-use application. In certain embodiments, the thickness of the light guide plate can be substantially uniform. In certain embodiments, the thickness of the light guide plate can be non-uniform (e.g., tapered).
In certain embodiments and aspects of the inventions described herein, desired % absorption of light emitted by the light source and re-emitted by the optical material can include, without limitation, from about 1% to about 50%, from about 10% to about 40%, from about 10% to about 35%, from about 10% to about 30%. Preferably, the quantum confined semiconductor nanoparticles absorb at least a portion of impinging light and reemit at least a portion of the absorbed light energy as one or more photons of a predetermined wavelength(s). Most preferably, the quantum confined semiconductor nanoparticles do not absorb any, or absorb only negligible amounts of, the re-emitted photons.
In certain embodiments and aspects of the inventions described herein, an optical component comprises a thin flexible component. In certain embodiments, the thickness of the optical component is less than or equal to about 1000 microns. In certain embodiments, the thickness of the component is less than or equal to about 500 microns. In certain embodiments, the thickness of the component is in a range from 10 to about 200 microns.
The foregoing, and other aspects and embodiments described herein all constitute embodiments of the present invention.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. Other embodiments will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein.
In the drawings,
The attached figures are simplified representations presented for purposes of illustration only; the actual structures may differ in numerous respects, particularly including the relative scale of the articles depicted and aspects thereof.
For a better understanding to the present invention, together with other advantages and capabilities thereof, reference is made to the following disclosure and appended claims in connection with the above-described drawings.
Various aspects and embodiments of the present inventions will be further described in the following detailed description.
Quantum confined semiconductor nanoparticles can confine electrons and holes and have a photoluminescent property to absorb light and re-emit different wavelength light. Color characteristics of emitted light from quantum confined semiconductor nanoparticles depend on the size of the quantum confined semiconductor nanoparticles and the chemical composition of the quantum confined semiconductor nanoparticles.
In certain embodiments, the quantum confined semiconductor nanoparticles include at least one type of quantum confined semiconductor nanoparticle with respect to chemical composition and size. The type(s) of quantum confined semiconductor nanoparticles included in an optical component in accordance with the invention are determined by the wavelength of light to be converted and the wavelengths of the desired light output. As discussed herein, quantum confined semiconductor nanoparticles may or may not include a shell and/or a ligand on a surface thereof. A shell and/or ligand can passivate quantum confined semiconductor nanoparticles to prevent agglomeration or aggregation to overcome the Van der Waals binding force between the nanoparticles. In certain embodiments, the ligand can comprise a material having an affinity for any host material in which a quantum confined semiconductor nanoparticle may be included. As discussed herein, in certain embodiments, a shell comprises an inorganic shell.
In certain embodiments of the present invention, there is provided an optical component. The optical component preferably comprises a light guide plate and an optical material disposed over at least a portion of a surface of the light guide plate, the optical material comprising red emitting quantum confined semiconductor nanoparticles. In certain embodiments, the optical material includes quantum confined semiconductor nanoparticles in an amount effective to absorb from about 1 to about 50% of light passed through the optical component. In certain embodiments, the optical material further comprises a host material. In certain embodiments, the host material is optically transparent. In certain embodiments, the optical material disposed on at least a portion of one of the major surfaces of the light guide plate.
An optical component of the invention is useful, when optically coupled to a light source, e.g., an inorganic LED (including, but not limited to, a white LED, etc,), for altering the wavelength or other characteristic of at least a portion of light emitted from the light source. In such application, quantum confined semiconductor nanoparticles are selected to have a bandgap smaller than the energy of at least a portion of the original light emitted from the light source. In certain embodiments, more than one light source can be optically coupled to an optical component.
In accordance with certain embodiments of the present invention, there is also provided a lighting system comprising a light source capable of generating light, and an optical component optically coupled to receive at least a portion of the light generated by the light source and convert at least a portion of the light so received to a predetermined wavelength such that the light emitted by the lighting system includes light emission from the light source supplemented with light emission at the predetermined wavelength or wavelengths, wherein the optical component including an optical material comprises quantum confined semiconductor nanoparticles.
In certain embodiments of the present invention there is provided a lighting system that includes, e.g., a light source comprising a white LED and an optical component comprising red-emitting quantum confined semiconductor nanoparticles, a red emission component is added to the light output of the lighting system. The addition of the red emission component can improve the useful front-screen power of the lighting system without increasing the power requirements thereof. For example, in such embodiments, using red-emitting quantum confined semiconductor nanoparticles to down convert the white (blue LED plus yellow phosphor) light from a typical LED can generate a greater quantity of useful front of screen luminance than can be achieved without the additional red emitting material. For a fixed amount of input electrical power, more useful optical power may be produced, or alternatively for the same front of screen brightness, less electrical power would need to be consumed from the power source.
To better understand the expected benefits and advantages of such lighting systems, reference is made to
“Front of Screen Spectra” included in
Also illustrated in
The wide band phosphors that are typically used on top of the blue LED (e.g., yellow) are designed to span both the red and green channels of the color filter array included in an LCD display, and hence the red color filter channel trades off color purity for power efficiency (as does the green). By using a narrow band red down converting material (e.g., red emitting quantum confined semiconductor nanoparticles) the red LCD channel can be saturated red light (CIE x>0.64) without sacrificing as much power transmission through the color filter. The same concept applies to the green, but has less differential advantage since the yellow phosphor provides a more significant green component than it provides in the red.
A lighting system in accordance with the invention can add saturated red light to the light source light output. This can provide more saturated red color for the same power input, or equivalent red power for lower electrical power consumption. Also, the inclusion of quantum confined semiconductor nanoparticles on the light guide plate rather than on or adjacent to the light source allows for a lower operating temperature at the QD material, hence enabling significant lifetime of operation which may be compatible with the commercial uses for mobile applications (1,000 hours to 20,000 hours).
In certain embodiments, an optical component includes a light guide plate including an optical material comprising a host material and quantum confined semiconductor nanoparticles. Optionally, scatterers and/or other additives can also be included in the composition.
In certain embodiments, an optical component includes at least one layer including an optical material comprising quantum confined semiconductor nanoparticles. Examples of compositions are described below. Other optional layers may also be included.
In certain embodiments, for example, an optical component may further include outcoupling members or structures across a surface of the light guide plate. In certain embodiments, outcoupling members or structures may be uniformly distributed across a surface of the light guide plate. In certain embodiments, outcoupling members or structures may vary in shape, size, and/or frequency in order to achieve a more uniform light distribution outcoupled from the surface. In certain embodiments, outcoupling members or structures may be positive, e.g., sitting or projecting above the surface of the light guide plate, or negative, e.g., depressions in the surface of the light guide plate, or a combination of both. In certain embodiments, an optical material including a host material and quantum confined semiconductor nanoparticles can be applied to a surface of a positive outcoupling member or structure and/or within a negative outcoupling member or structure. In certain embodiments, the optical material may be applied to the surface of the light guide plate opposite of the outcoupling members or structures. In certain embodiments, an outcoupling member or structure can comprise an optical material including a host material and quantum confined semiconductor nanoparticles.
In certain embodiments, outcoupling members or structures can be formed by molding, embossing, lamination, applying a curable formulation (formed, for example, by techniques including, but not limited to, spraying, lithography, printing (screen, inkjet, flexography, etc), etc.).
In certain embodiments, quantum confined semiconductor nanoparticles included in an optical material is from about 0.001 to about 5 weight percent quantum confined semiconductor nanoparticles based on the weight of the optical material. In certain preferred embodiments, the effective amount is from about 0.01 to about 2 weight percent quantum confined semiconductor nanoparticles based on the weight of the optical material. In certain more preferred embodiments, the composition includes from about 0.01 to about 1 weight percent quantum confined semiconductor nanoparticles based on the weight of the optical material. In certain embodiments including scatterers, the optical material includes from about 0.001 to about 5 weight percent scatterers based on the weight of the optical material.
In certain embodiments, the optical material is disposed across a major surface of the light guide plate. In certain embodiments, the optical material is sandwiched between light guide plates.
In certain embodiments, the optical material is disposed as an uninterrupted layer across a major surface of the light guide plate. In certain embodiments, the optical material comprises a plurality of features on a major surface of the light guide plates, the plurality of features can be arranged in a pattern. In certain of such embodiments, each feature can have a shape that is the same or similar to the shape of the other features. In certain of such embodiments, the shapes of all of the features need not be the same or similar.
In certain embodiments including a layer of optical material including quantum confined semiconductor nanoparticles dispersed in a host material that is disposed across all or a predetermined area of a surface of a light guide plate, the concentration of the nanoparticles can be graded to increase or decrease across all or a predetermined area of the surface.
In certain embodiments including a plurality of features, each feature can have size dimensions (e.g., length, width, and thickness) that are the same or similar to that of the other features. In certain embodiments, the size of all of the features need not be the same or similar.
In certain embodiments, a feature can have a thickness from about 0.1 to about 200 microns.
In certain embodiments, the features can be spatially dithered.
Dithering or spatial dithering is a term used, for example, in digital imaging to describe the use of small areas of a predetermined palette of colors to give the illusion of color depth. For example, white is often created from a mixture of small red, green and blue areas. In certain embodiments, using dithering of compositions including different types of quantum confined semiconductor nanoparticles (wherein each type is capable of emitting light of a different color) disposed on and/or embedded in a surface of a light guide plate can create the illusion of a different color. In certain embodiments, a light guide plate that appears to emit white light can be created from a dithered pattern of features including, for example, red, green and blue-emitting quantum confined semiconductor nanoparticles. Dithered color patterns are well known.
In certain embodiments, a predetermined color light can be obtained by layering compositions including different types of quantum confined semiconductor nanoparticles (based on composition and size) wherein each type is selected to obtain light having a predetermined color.
In certain embodiments, white light can be obtained by including different types of quantum confined semiconductor nanoparticles (based on composition and size) in a host material, wherein each type is selected to obtain light having a predetermined color.
In certain embodiments, an optical material comprising a host material and quantum confined semiconductor nanocrystals is preferably hardened after it is applied to, or embedded in, a surface of a light guide plate. For example, in certain embodiments, the composition may be applied in a molten state which can harden upon cooling; it may be uv-, thermal-, chemically- or otherwise curable and cured after being applied to, or embedded in, a surface of a light guide plate, etc. Alternatively, the optical material may be hardened as a separate film, and then laminated to the surface of the light guide plate by methods known in the art.
While a filter layer is not required to provide a predetermined spectral component as a component of the light output generated with use of an optical component or by a lighting system in accordance with the invention, and may be undesirable for energy considerations, there may be instances in which a filter is included for other reasons. In such instances, a filter may be included. In certain embodiments, a filter may cover all or at least a predetermined portion of the light guide plate. In certain embodiments, a filter can be included for blocking the passage of one or more predetermined wavelengths of light. A filter layer can be included over or under the optical material. In certain embodiments, an optical component can include multiple filter layers on various surfaces of the light guide plate. In certain embodiments, a filter may be transmissive to certain wavelengths and reflective to others.
In certain embodiments, an optical component optionally further includes one or more outcoupling members or structures that permit at least a portion of light emitted from a light source to be optically coupled from the light source into the light guide plate. Such members or structures include, for example, and without limitation, members or structures that are attached to a surface of the light guide plate, protrude from a surface of the light guide plate (e.g., prisms), are at least partially embedded in the light guide plate, or are positioned at least partially within a cavity in the light guide plate. In certain embodiments, for example, outcoupling members or structures may be uniformly distributed across a surface of the light guide plate of the optical component. In certain embodiments, outcoupling members or structures may vary in shape, size, and/or frequency in order to achieve a more uniform light distribution outcoupled from the surface. In certain embodiments, outcoupling members or structures may be positive, i.e., sitting above the surface of the light guide plate, or negative, i.e., depressed into the surface of the light guide plate, or a combination of both. In certain embodiments, one or more features comprising quantum confined semiconductor nanoparticles and a host material can be applied to a surface of a positive outcoupling member or structure, within a negative outcoupling member or structure. In certain embodiments, the optical material may be applied to the surface of the light guide plate opposite of the outcoupling members or structures. In certain embodiments, an outcoupling member or structure can comprise quantum confined semiconductor nanoparticles and a host material.
In certain embodiments, outcoupling members or structures can be formed by molding, embossing, lamination, applying a curable formulation (formed, for example, by techniques including, but not limited to, spraying, lithography, printing (screen, inkjet, flexography, etc), etc.)
In certain embodiments, quantum confined semiconductor nanoparticles are included in the light guide plate in an amount in the range from about 0.001 to about 5 weight percent based on the weight of the light guide plate. In certain preferred embodiments, the light guide plate includes from about 0.01 to about 3 weight percent quantum confined semiconductor nanoparticles based on the weight of the light guide plate. In certain more preferred embodiments, the light guide plate includes from about 0.01 to about 2 weight percent quantum confined semiconductor nanoparticles based on the weight of the light guide plate. In certain most preferred embodiments, the light guide plate includes from about 0.1 to about 1 weight percent quantum confined semiconductor nanoparticles based on the weight of the light guide plate. In certain embodiments, quantum confined semiconductor nanoparticles can be distributed within the light guide plate. In certain embodiments, quantum confined semiconductor nanocrystals can be distributed in a predetermined region of the light guide plate. In certain embodiments, the distribution of quantum confined semiconductor nanoparticles can be substantially uniform throughout the predetermined region of the light guide plate. In certain embodiments, the concentration of quantum confined semiconductor nanoparticles throughout the predetermined region of the light guide plate can be non-uniform (e.g., graded). In certain embodiments, quantum confined semiconductor nanocrystals can be distributed throughout the entire light guide plate. In certain embodiments, the distribution of quantum confined semiconductor nanoparticles can be substantially uniform throughout the entire light guide plate. In certain embodiments, the concentration of quantum confined semiconductor nanoparticles throughout the light guide plate can be non-uniform (e.g., graded). In certain embodiments, scatterers are also distributed within the light guide plate. In certain embodiments, scatterers are included in an amount in the range from about 0.001 to about 5 weight percent of the weight of the light guide plate. In certain embodiments, additional additives can be included within the light guide plate (e.g., without limitation additional surfactants, defoaming agents).
In certain embodiments, the quantum confined semiconductor nanoparticles are included in a layer disposed over a surface of the light guide plate. In certain embodiments, the quantum confined semiconductor nanoparticles are included in a layer sandwiched between light guide plates.
In certain embodiments, the layer has a thickness from about 0.1 to about 200 microns.
In certain embodiments, the layer further comprises a host material in which the quantum confined semiconductor nanoparticles are distributed.
In certain embodiments, quantum confined semiconductor nanoparticles are included in the layer in an amount in the range from about 0.001 to about 5 weight percent of the weight of the host material. In certain preferred embodiments, the layer includes from about 0.01 to about 3 weight percent quantum confined semiconductor nanoparticles based on the weight of the host material. In certain more preferred embodiments, the layer includes from about 0.01 to about 2 weight percent quantum confined semiconductor nanoparticles based on the weight of the host material. In certain most preferred embodiments, the layer includes from about 0.1 to about 1 weight percent quantum confined semiconductor nanoparticles based on the weight of the host material.
In certain embodiments, the host material can comprise a polymer, monomer, resin, binder, glass, metal oxide or other nonpolymeric material. Other examples of host materials are described herein.
In certain embodiments, the quantum confined semiconductor nanoparticles are uniformly dispersed in the layer. In certain embodiments, the quantum confined semiconductor nanoparticles are non-uniformly dispersed in the layer. In certain embodiments, scatterers may also be included in the layer. In certain embodiments, scatterers are included in the layer in an amount in the range from about 0.001 to about 5 weight percent of the weight of the host material.
Optionally other additives (including, but not limited to, UV absorbers, etc.) can be included in the layer.
In certain embodiments, a plurality of layers comprising quantum confined semiconductor nanoparticles can be disposed over a surface of the light guide plate. In certain embodiments, additional additives can be included within the light guide plate (e.g., without limitation additional surfactants, defoaming agents, scatterers).
In certain embodiments, the light guide plate includes a layer comprising an optical material comprising quantum confined semiconductor nanoparticles disposed as a patterned layer over a predetermined area of a surface of the light guide plate. In certain preferred embodiments, the layer comprising an optical material comprising quantum confined semiconductor nanoparticles are arranged in predetermined pattern wherein the quantum confined semiconductor nanoparticles are selected and tuned to emit photons of predetermined wavelength in response to absorption of light.
In certain embodiments, the light guide plates includes a layer comprising quantum confined semiconductor nanoparticles disposed as an unpatterned layer over a predetermined area of a surface of the light guide plate.
In certain embodiments, an optical component further includes a coupling means for coupling light from a light source through an edge of the light guide plate. Examples of light sources include, but are not limited to, those listed below. In certain embodiments, more than one coupling means can be included for coupling more than one light source to the light guide plate.
As described above, a lighting system can include an optical component including an optical material comprising quantum confined semiconductor nanoparticles disposed on a light guide plate and a light source optically coupled to the light guide plate.
Examples of light sources include, without limitation, solid state light emitting devices (e.g., an electroluminescent device, an LED (e.g., an inorganic LED, such as an inorganic semiconductor LEDs, which are well known in the art and are available from numerous sources.) A light source preferably emits in the visible region of the electromagnetic spectrum.
In certain embodiments, a system can include a single light source.
In certain embodiments, a system can include a plurality of light sources.
In certain embodiments including a plurality of light sources, the individual light sources can be the same or different.
In certain embodiments including a plurality of light sources, each individual light sources can emit light having a wavelength that is the same as or different from that emitted by each of the other light sources.
In certain embodiments including a plurality of light sources, the individual light sources can be arranged as an array.
In certain embodiments including a plurality of light sources, the individual light sources can optically coupled to introduce light into the same or different areas of the light guide plate.
In certain embodiments, a light source comprises a blue LEDs (e.g., (In)GaN blue).
In certain embodiments, a light source or light source array is optically coupled to an edge of the light guide plate.
In certain embodiments, the weight ratio of quantum confined semiconductor nanoparticles to scatterers is from about 1:100 to about 100:1.
In certain embodiments, and optical material further includes a host material. Examples of a host material useful in various embodiments and aspect of the inventions described herein include polymers, monomers, resins, binders, glasses, metal oxides, and other nonpolymeric materials. In certain embodiments, the host material is non-photoconductive. In certain embodiments, an additive capable of dissipating charge is further included in the host material. In certain embodiments, the charge dissipating additive is included in an amount effective to dissipate any trapped charge. In certain embodiments, the host material is non-photoconductive and further includes an additive capable of dissipating charge, wherein the additive is included in an amount effective to dissipate any trapped charge. Preferred host materials include polymeric and nonpolymeric materials that are at least partially transparent, and preferably fully transparent, to preselected wavelengths of visible and non-visible light. In certain embodiments, the preselected wavelengths can include wavelengths of light in the visible (e.g., 400-700 nm), ultraviolet (e.g., 10-400 nm), and/or infrared (e.g., 700 nm-12 μm) regions of the electromagnetic spectrum. Preferred host materials include cross-linked polymers. Examples of preferred host materials include, but are not limited to, glass or a transparent resin. In particular, a resin such as a non-curable resin, heat-curable resin, or photocurable resin is suitably used from the viewpoint of processability. As specific examples of such a resin, in the form of either an oligomer or a polymer, a melamine resin, a phenol resin, an alkyl resin, an epoxy resin, a polyurethane resin, a maleic resin, a polyamide resin, polymethyl methacrylate, polyacrylate, polycarbonate, polyvinyl alcohol, polyvinylpyrrolidone, hydroxyethylcellulose, carboxymethylcellulose, copolymers containing monomers forming these resins, and the like.
In certain embodiments and aspects of the inventions described herein, a photocurable resin may be used in order to pattern the composition. As a photo-curable resin, a photo-polymerizable resin such as an acrylic acid or methacrylic acid based resin containing a reactive vinyl group, a photo-crosslinkable resin which generally contains a photo-sensitizer, such as polyvinyl cinnamate, or the like may be used. A heat-curable resin may be used when the photo-sensitizer is not used. These resins may be used individually or in combination of two or more.
Examples of scatterers (also referred to herein as light scattering particles) that can be used in the embodiments and aspects of the inventions described herein, include, without limitation, metal or metal oxide particles, air bubbles, and glass and polymeric beads (solid or hollow). Other scatterers can be readily identified by those of ordinary skill in the art. In certain embodiments, scatterers have a spherical shape. Preferred examples of scattering particles include, but are not limited to, TiO2, SiO2, BaTiO3, BaSO4, and ZnO. Particles of other materials that are non-reactive with the host material and that can increase the absorption pathlength of the excitation light in the host material can be used. In certain embodiments, the scatterers may have a high index of refraction (e.g., TiO2, BaSO4, etc) or a low index of refraction (gas bubbles).
Selection of the size and size distribution of the scatterers is readily determinable by those of ordinary skill in the art. The size and size distribution is preferably based upon the refractive index mismatch of the scattering particle and the host material in which it the scatterer is to be dispersed, and the preselected wavelength(s) to be scattered according to Rayleigh scattering theory. The surface of the scattering particle may further be treated to improve dispersability and stability in the host material. In one embodiment, the scattering particle comprises TiO2 (R902+ from DuPont) of 0.2 μm particle size, in a concentration in a range from about 0.001 to about 5% by weight. In certain preferred embodiments, the concentration range of the scatterers is between 0.1% and 2% by weight.
In certain embodiments of the inventions described herein, quantum confined semiconductor nanoparticles (e.g., semiconductor nanocrystals) are distributed within the host material as individual particles.
In certain embodiments of the inventions described herein, quantum confined semiconductor nanoparticles distributed within the host material may include flocculated (or aggregated) particles.
In certain embodiments of the inventions described herein, quantum confined semiconductor nanoparticles may be included within or adsorbed onto polymer particles.
Quantum confined semiconductor nanoparticles possess characteristics and properties that make them particularly well-suited for use in a variety of devices and end-use applications, including, but not limited to, light emitting devices, solid state lighting, displays, photodetectors, nonvolatile memory devices, solar cells, sensors, photovoltaic devices, etc.
In certain embodiments, a display includes a lighting system in accordance with the invention. In certain embodiments, the optical component is back-illuminated (back-lit), front illuminated (front-lit), edge-illuminated (edge-lit), or with other configurations wherein light from a light source is directed through the optical component for creating display images or indicia. In certain embodiments, the display is a liquid crystal display.
In certain embodiments, an optical component can be a top or bottom surface, or other component of a light emitting device, a display, another type of lighting device or unit, a waveguide, and the like.
In certain embodiments, an optical component may optionally include one or more additional layers and/or elements. In one embodiment, for example, an optical component may further include one or more separate layers including scatterers. A layer including scatterers may be disposed over and/or under any layer or other arrangement of semiconductor nanocrystals included in the optical component (whether or not the layer or other arrangement of semiconductor nanocrystals further includes scatters and/or other additives or materials). In certain embodiments of an optical component including two or more stacked layers or other arrangements including semiconductor nanocrystals, one or more layers comprising scatterers may be disposed between any or all of the layers including semiconductor nanocrystals. Examples of scatters are provided elsewhere herein. In certain embodiments, layers including scatterers can be patterned or unpatterned. In various embodiments and aspects of the compositions, components, systems, and devices of the invention, quantum confined semiconductor nanoparticles comprise semiconductor nanocrystals. Semiconductor nanocrystals possess characteristics and properties that make them particularly well-suited for use in a variety of devices and other end-use applications, including, but not limited to, light emitting devices, displays, photodetectors, nonvolatile memory devices, solar cells, sensors, photovoltaic devices, etc.
Examples of optical coupling methods include, but are not limited to, methods of coupling wherein the two regions coupled together have similar refractive indices or using an optical adhesive with a refractive index substantially near or in-between the regions or layers. Optical coupling can also be accomplished by an air gap between the light source and light guide plate. Other non-limiting examples of optical coupling include lamination using an index-matched optical adhesive, coating a region or layer onto another region or layer, or hot lamination using applied pressure to join two or more layers or regions that have substantially close refractive indices. Thermal transferring is another method that can be used to optically couple two regions of material.
In the example shown in
As described herein, in certain embodiments of the present invention, a lighting system comprises a light source capable of generating light, and an optical component optically coupled to receive at least a portion of the light generated by the light source and convert at least a portion of the light so received to a predetermined wavelength such that the light emitted by the lighting system includes light emission from the light source supplemented with light emission at the predetermined wavelength, wherein the optical component including an optical material comprises quantum confined semiconductor nanoparticles.
In certain embodiments, the optical component further includes a light guide plate. In certain embodiments, the light guide plate is optically transparent. In certain embodiments, optical material is disposed on a predetermined area of a surface of the light guide plate. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material. In certain embodiments, the optical material comprises quantum confined semiconductor nanoparticles having compositions selected to convert at least a portion of the light received from the light source to light emission having a predetermined wavelength.
In certain embodiments, the optical material is not in direct contact with the light source. Preferably the temperature at the location of the nanoparticles during operation of the lighting system is less than 90° C., more preferably less than 75° C., and most preferably 60° C. or less.
A lighting system in accordance with certain embodiments of the present invention can be useful as a backlight unit (BLU) for a liquid crystal device (LCD), including but not limited to LCD BLUs for various mobile applications, including but not limited to, cell phones, computers, GPS navigational devices, portable video devices, and other portable devices including displays.
In certain embodiments, the light source comprises a white LED (e.g., a blue emitting semiconductor LED that is encapsulated with an encapsulant including phosphor material (e.g., typically a yellow phosphor material) for converting the blue LED light output to white), and the optical component comprises an optical material comprising quantum confined semiconductor nanoparticles capable of emitting red light.
In certain embodiments, the optical component comprises a light guide plate and an optical material disposed on a predetermined area of a surface of the light guide plate, wherein the optical material comprises quantum confined semiconductor nanoparticles. In certain embodiments, the light guide plate is optically transparent. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material.
In certain embodiments, the host material is optically transparent. In certain embodiments, the nanoparticles are dispersed in the host material. In certain embodiments, the nanoparticles are uniformly dispersed in the host material. In certain embodiments, the optical material disposed on at least a portion of one of the major surfaces of the light guide plate. In certain embodiments, one or more optional layers or materials may be included between the surface of the light guide plate and the optical material.
In certain embodiments of a lighting system in accordance with the invention that include, e.g., a light source comprising a white LED and an optical component comprising red-emitting quantum confined semiconductor nanoparticles, a red emission component is added to the light output of the lighting system. The addition of the red emission component can improve the useful front-screen power of the lighting system without increasing the power requirements thereof. For example, in such embodiments, using red-emitting quantum confined semiconductor nanoparticles to down convert the white (blue plus yellow phosphor) light from a typical LED can generate a greater quantity of useful front of screen luminance than can be achieved without the additional red emitting material. For a fixed amount of input electrical power, more useful optical power may be produced, or alternatively for the same front of screen brightness, less electrical power would need to be consumed from the power source.
Because semiconductor nanocrystals have narrow emission linewidths, are photoluminescent efficient, and emission wavelength tunable with the size and/or composition of the nanocrystals, they are preferred quantum confined semiconductor nanocrystals for use in the various aspects and embodiments of the inventions described herein.
The size and composition of quantum confined semiconductor nanoparticles (including, e.g., semiconductor nanocrystals) useful in the various aspects and embodiments of the inventions can be selected such that semiconductor nanocrystals emit photons at a predetermined wavelength of wavelength band in the far-visible, visible, infra-red or other desired portion of the spectrum. For example, the wavelength can be between 300 and 2,500 nm or greater, such as between 300 and 400 nm, between 400 and 700 nm, between 700 and 1100 nm, between 1100 and 2500 nm, or greater than 2500 nm.
Quantum confined semiconductor nanoparticles (including, e.g., semiconductor nanocrystals) are nanometer-scale inorganic semiconductor nanoparticles. Semiconductor nanocrystals include, for example, inorganic crystallites between about 1 nm and about 1000 nm in diameter, preferably between about 2 nm and about 50 um, more preferably about 1 nm to about 20 nm (such as about 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nm).
Semiconductor nanocrystals included in various aspect and embodiments of the inventions most preferably have an average nanocrystal diameter less than about 150 Angstroms (Å). In certain embodiments, semiconductor nanocrystals having an average nanocrystal diameter in a range from about 12 to about 150 Å can be particularly desirable.
However, depending upon the composition and desired emission wavelength of the semiconductor nanocrystal, the average diameter may be outside of these various preferred size ranges.
The semiconductor forming the nanoparticles and nanocrystals for use in the various aspects and embodiments of the inventions described herein can comprise Group IV elements, Group II-VI compounds, Group II-V compounds, Group III-VI compounds, Group III-V compounds, Group IV-VI compounds, Group compounds, Group II-IV-VI compounds, or Group II-IV-V compounds, for example, CdS, CdO, CdSe, CdTe, ZnS, ZnO, ZnSe, ZnTe, MgTe, GaAs, GaP, GaSb, GaN, HgS, HgO, HgSe, HgTe, InAs, InP, InSb, InN, AlAs, AlP, AlSb, AlS, PbS, PbO, PbSe, Ge, Si, alloys thereof, and/or mixtures thereof, including ternary and quaternary mixtures and/or alloys.
Examples of the shape of the nanoparticles and nanocrystals include sphere, rod, disk, other shape or mixtures thereof.
In certain preferred aspects and embodiments of the inventions, quantum confined semiconductor nanoparticles (including, e.g., semiconductor nanocrystals) include a “core” of one or more first semiconductor materials, which may include an overcoating or “shell” of a second semiconductor material on at least a portion of a surface of the core. In certain embodiments, the shell surrounds the core. A quantum confined semiconductor nanoparticle (including, e.g., semiconductor nanocrystal) core including a shell on at least a portion of a surface of the core is also referred to as a “core/shell” semiconductor nanocrystal.
For example, a quantum confined semiconductor nanoparticle (including, e.g., semiconductor nanocrystal) can include a core comprising a Group IV element or a compound represented by the formula MX, where M is cadmium, zinc, magnesium, mercury, aluminum, gallium, indium, thallium, or mixtures thereof, and X is oxygen, sulfur, selenium, tellurium, nitrogen, phosphorus, arsenic, antimony, or mixtures thereof. Examples of materials suitable for use as a core include, but are not limited to, CdS, CdO, CdSe, CdTe, ZnS, ZnO, ZnSe, ZnTe, MgTe, GaAs, GaP, GaSb, GaN, HgS, HgO, HgSe, HgTe, InAs, InP, InSb, InN, AlAs, AlP, AlSb, AlS, PbS, PbO, PbSe, Ge, Si, alloys thereof, and/or mixtures thereof, including ternary and quaternary mixtures and/or alloys. Examples of materials suitable for use as a shell include, but are not limited to, CdS, CdO, CdSe, CdTe, ZnS, ZnO, ZnSe, ZnTe, MgTe, GaAs, GaP, GaSb, GaN, HgS, HgO, HgSe, HgTe, InAs, InP, InSb, InN, AlAs, AlP, AlSb, AlS, PbS, PbO, PbSe, Ge, Si, alloys thereof, and/or mixtures thereof, including ternary and quaternary mixtures and/or alloys.
In certain embodiments, the surrounding “shell” material can have a bandgap greater than the bandgap of the core material and can be chosen so as to have an atomic spacing close to that of the “core” substrate. In another embodiment, the surrounding shell material can have a bandgap less than the bandgap of the core material. In a further embodiment, the shell and core materials can have the same crystal structure. Shell materials are discussed further below. For further examples of core/shell semiconductor structures, see U.S. application Ser. No. 10/638,546, entitled “Semiconductor Nanocrystal Heterostructures”, filed 12 Aug. 2003, which is hereby incorporated herein by reference in its entirety.
Quantum confined semiconductor nanoparticles are preferably members of a population of semiconductor nanoparticles having a narrow size distribution. More preferably, the quantum confined semiconductor nanoparticles (including, e.g., semiconductor nanocrystals) comprise a monodisperse or substantially monodisperse population of nanoparticles.
In certain embodiments, the % absorption of quantum confined semiconductor nanoparticles included in the various aspects and embodiments of the invention is, for example, from about 0.1% to about 99%; and preferably of at least about 10% to about 99%. In one preferred example, the % absorption is from about 10% to about 90% absorption. In another preferred example, the % absorption is from about 10% to about 50%; in another example, the % absorption if from about 50% to about 90%.
Quantum confined semiconductor nanoparticles show strong quantum confinement effects that can be harnessed in designing bottom-up chemical approaches to create optical properties that are tunable with the size and composition of the nanoparticles.
For example, preparation and manipulation of semiconductor nanocrystals are described in Murray et al. (J. Am. Chem. Soc., 115:8706 (1993)); in the thesis of Christopher Murray, “Synthesis and Characterization of II-VI Quantum Dots and Their Assembly into 3-D Quantum Dot Superlattices”, Massachusetts Institute of Technology, September, 1995; and in U.S. patent application Ser. No. 08/969,302 entitled “Highly Luminescent Color-selective Materials” which are hereby incorporated herein by reference in their entireties. Other examples of the preparation and manipulation of semiconductor nanocrystals are described in U.S. Pat. Nos. 6,322,901 and 6,576,291, and U.S. Patent Application No. 60/550,314, each of which is hereby incorporated herein by reference in its entirety.
Additional examples of methods of preparing semiconductor nanocrystals are described in; Murray, et al., J. Am. Chem. Soc., Vol. 115, 8706 (1993); Kortan, et al., J. Am. Chem. Soc., Vol. 112, 1327 (1990); and the Thesis of Christopher Murray, “Synthesis and Characterization of II-VI Quantum Dots and Their Assembly into 3-D Quantum Dot Superlattices”, Massachusetts Institute of Technology, September, 1995, U.S. Application No. 60/971,887 of Breen, et al., for “Functionalized Semiconductor Nanocrystals And Method”, filed 12 Sep. 2007, U.S. Application No. 60/866,822 of Clough, et al., for “Nanocrystals Including A Group IIIA Element And A Group VA Element, Method, Composition, Device and Other Products”, filed 21 Nov. 2006; U.S. Provisional Patent Application No. 60/866,828 of Craig Breen et al., for “Semiconductor Nanocrystal Materials And Compositions And Devices Including Same,” filed 21 Nov. 2006; U.S. Provisional Patent Application No. 60/866,832 of Craig Breen et al. for “Semiconductor Nanocrystal Materials And Compositions And Devices Including Same,” filed 21 Nov. 2006; U.S. Provisional Patent Application No. 60/866,833 of Dorai Ramprasad for“Semiconductor Nanocrystal And Compositions And Devices Including Same” filed 21 Nov. 2006; U.S. Provisional Patent Application No. 60/866,834 of Dorai Ramprasad for “Semiconductor Nanocrystal And Compositions And Devices Including Same,” filed 21 Nov. 2006; U.S. Provisional Patent Application No, 60/866,839 of Dorai Ramprasad for “Semiconductor Nanocrystal And Compositions And Devices Including Same” filed 21 Nov. 2006; and U.S. Provisional Patent Application No. 60/866,843 of Dorai Ramprasad for “Semiconductor Nanocrystal And Compositions And Devices Including Same,” filed 21 Nov. 2006. Each of the foregoing is hereby incorporated by reference herein in its entirety.
In various aspects and embodiments of the invention, quantum confined semiconductor nanoparticles (including, but not limited to, semiconductor nanocrystals) optionally have ligands attached thereto.
In certain embodiments, the ligands are derived from the coordinating solvent used during the growth process. The surface can be modified by repeated exposure to an excess of a competing coordinating group to form an overlayer. For example, a dispersion of the capped semiconductor nanocrystal can be treated with a coordinating organic compound, such as pyridine, to produce crystallites which disperse readily in pyridine, methanol, and aromatics but no longer disperse in aliphatic solvents. Such a surface exchange process can be carried out with any compound capable of coordinating to or bonding with the outer surface of the semiconductor nanocrystal, including, for example, phosphines, thiols, amines and phosphates. The semiconductor nanocrystal can be exposed to short chain polymers which exhibit an affinity for the surface and which terminate in a moiety having an affinity for a suspension or dispersion medium. Such affinity improves the stability of the suspension and discourages flocculation of the semiconductor nanocrystal. In other embodiments, semiconductor nanocrystals can alternatively be prepared with use of non-coordinating solvent(s).
For example, a coordinating ligand can have the formula:
(Y—)k-n—(X)-(-L)n
wherein k is 2, 3 or 5, and n is 1, 2, 3, 4 or 5 such that k-n is not less than zero; X is O, S, S═O, SO2, Se, Se═O, N, N═O, P, P═O, As, or As═O; each of Y and L, independently, is aryl, heteroaryl, or a straight or branched C2-12 hydrocarbon chain optionally containing at least one double bond, at least one triple bond, or at least one double bond and one triple bond. The hydrocarbon chain can be optionally substituted with one or more C1-4 alkyl, C2-4 alkenyl, C2-4 alkynyl, C1-4 alkoxy, hydroxyl, halo, amino, nitro, cyano, C3-5 cycloalkyl, 3-5 membered heterocycloalkyl, aryl, heteroaryl, C1-4 alkylcarbonyloxy, C1-4 alkyloxycarbonyl, C1-4 alkylcarbonyl, or formyl. The hydrocarbon chain can also be optionally interrupted by —O—, —S—, —N(Ra)—, —N(Ra)—C(O)—O—, —O—C(O)—N(Ra)—, —N(Ra)—C(O)—N(Rb)—, —O—C(O)—O—, —P(Ra)—, or —P(O)(Ra)—. Each of Ra and Rb, independently, is hydrogen, alkyl, alkenyl, alkynyl, alkoxy, hydroxylalkyl, hydroxyl, or haloalkyl. An aryl group is a substituted or unsubstituted cyclic aromatic group. Examples include phenyl, benzyl, naphthyl, tolyl, anthracyl, nitrophenyl, or halophenyl. A heteroaryl group is an aryl group with one or more heteroatoms in the ring, for instance furyl, pyiridyl, pyrrolyl, phenanthryl.
A suitable coordinating ligand can be purchased commercially or prepared by ordinary synthetic organic techniques, for example, as described in J. March, Advanced Organic Chemistry, which is incorporated herein by reference in its entirety.
See also U.S. patent application Ser. No. 10/641,292 entitled “Stabilized Semiconductor Nanocrystals”, filed 15 Aug. 2003, which is hereby incorporated herein by reference in its entirety.
When an electron and hole localize on a quantum confined semiconductor nanoparticle (including, but not limited to, a semiconductor nanocrystal), emission can occur at an emission wavelength. The emission has a frequency that corresponds to the band gap of the quantum confined semiconductor material. The band gap is a function of the size of the nanoparticle. Quantum confined semiconductor nanoparticle s having small diameters can have properties intermediate between molecular and bulk forms of matter. For example, quantum confined semiconductor nanoparticles having small diameters can exhibit quantum confinement of both the electron and hole in all three dimensions, which leads to an increase in the effective band gap of the material with decreasing crystallite size. Consequently, for example, both the optical absorption and emission of semiconductor nanocrystals shift to the blue, or to higher energies, as the size of the crystallites decreases.
For an example of blue light-emitting semiconductor nanocrystal materials, see U.S. patent application Ser. No. 11/071,244, filed 4 Mar. 2005, now U.S. Pat. No. 7,253,452, which is hereby incorporated by reference herein in its entirety.
The emission from a quantum confined semiconductor nanoparticle can be a narrow Gaussian emission band that can be tuned through the complete wavelength range of the ultraviolet, visible, or infra-red regions of the spectrum by varying the size of the quantum confined semiconductor nanoparticle, the composition of the quantum confined semiconductor nanoparticle, or both. For example, CdSe can be tuned in the visible region and InAs can be tuned in the infra-red region. The narrow size distribution of a population of quantum confined semiconductor nanoparticles can result in emission of light in a narrow spectral range. The population can be monodisperse preferably exhibits less than a 15% rms (root-mean-square) deviation in diameter of the quantum confined semiconductor nanoparticle s, more preferably less than 10%, most preferably less than 5%. Spectral emissions in a narrow range of no greater than about 75 nm, preferably 60 nm, more preferably 40 nm, and most preferably 30 nm full width at half max (FWHM) for quantum confined semiconductor nanoparticle s that emit in the visible can be observed. IR-emitting quantum confined semiconductor nanoparticle s can have a FWHM of no greater than 150 nm, or no greater than 100 nm. Expressed in terms of the energy of the emission, the emission can have a FWHM of no greater than 0.05 eV, or no greater than 0.03 eV. The breadth of the emission decreases as the dispersity of quantum confined semiconductor nanoparticle diameters decreases.
For example, semiconductor nanocrystals can have high emission quantum efficiencies such as greater than 10%, 20%, 30%, 40%, 50%, 60%, 70%, or 80%.
The narrow FWHM of semiconductor nanocrystals can result in saturated color emission. The broadly tunable, saturated color emission over the entire visible spectrum of a single material system is unmatched by any class of organic chromophores (see, for example, Dabbousi et al., J. Phys. Chem. 101, 9463 (1997), which is incorporated by reference in its entirety). A monodisperse population of semiconductor nanocrystals will emit light spanning a narrow range of wavelengths. A pattern including more than one size of semiconductor nanocrystal can emit light in more than one narrow range of wavelengths. The color of emitted light perceived by a viewer can be controlled by selecting appropriate combinations of semiconductor nanocrystal sizes and materials. The degeneracy of the band edge energy levels of semiconductor nanocrystals facilitates capture and radiative recombination of all possible excitons.
Transmission electron microscopy (TEM) can provide information about the size, shape, and distribution of the semiconductor nanocrystal population. Powder X-ray diffraction (XRD) patterns can provide the most complete information regarding the type and quality of the crystal structure of the semiconductor nanocrystals. Estimates of size are also possible since particle diameter is inversely related, via the X-ray coherence length, to the peak width. For example, the diameter of the semiconductor nanocrystal can be measured directly by transmission electron microscopy or estimated from X-ray diffraction data using, for example, the Scherrer equation. It also can be estimated from the UV/Vis absorption spectrum.
Quantum confined semiconductor nanoparticles are preferably handled in a controlled (oxygen-free and moisture-free) environment, preventing the quenching of luminescent efficiency during the fabrication process.
Quantum confined semiconductor nanoparticles can be dispersed in a liquid medium and are therefore compatible with thin-film deposition techniques such as spin-casting, drop-casting, and dip coating.
In certain preferred embodiments, an optical material for use in various aspects and embodiments in accordance with the invention can be prepared, for example, from an ink comprising quantum confined semiconductor nanoparticles and a liquid vehicle, wherein the liquid vehicle comprises one or more functional groups that are capable of being polymerized (e.g., cross-linked) to form a host material. In certain embodiments, the functional units can be cross-linked by UV treatment. In certain embodiments, the functional units can be cross-linked by thermal treatment. In certain embodiments, the functional units can be cross-linked by other cross-linking technique readily ascertainable by a person of ordinary skill in a relevant art. In certain embodiments, the optical material including one or more functional groups that are capable of being cross-linked can be the liquid vehicle itself. See also U.S. Application No. 60/946,090 of Linton, et al., for “Methods For Depositing Nanomaterial, Methods For Fabricating A Device, Methods For Fabricating An Array Of Devices And Compositions”, filed 25 Jun. 2007, and U.S. Application No. 60/949,306 of Linton, et al., for “Compositions, Methods For Depositing Nanomaterial, Methods For Fabricating A Device, And Methods For Fabricating An Array Of Devices”, filed 12 Jul. 2007, the disclosures of each of which are hereby incorporated herein by reference. Optionally, the ink further includes scatterers and/or other additives.
An ink can be deposited onto a surface of a substrate by printing, screen-printing, spin-coating, gravure techniques, inkjet printing, roll printing, etc. The ink can be deposited in a predetermined arrangement. For example, the ink can be deposited in a patterned or unpatterned arrangement. For additional information that may be useful to deposit an ink onto a substrate, see for example, International Patent Application No. PCT/US2007/014711, entitled “Methods For Depositing Nanomaterial, Methods For Fabricating A Device, And Methods For Fabricating An Array Of Devices”, of Seth A. Coe-Sullivan, filed 25 Jun. 2007, International Patent Application No. PCT/US2007/014705, entitled “Methods For Depositing Nanomaterial, Methods For Fabricating A Device, Methods For Fabricating An Array Of Devices And Compositions”, of Seth A. Coe-Sullivan, et al., filed 25 Jun. 2007, International Patent Application No. PCT/US2007/014706, entitled “Methods And Articles Including Nanomaterial”, of Seth A. Coe-Sullivan, et al., filed 25 Jun. 2007, International Patent Application No. PCT/US2007/08873, entitled “Composition Including Material, Methods Of Depositing Material, Articles Including Same And Systems For Depositing Material”, of Seth A. Coe-Sullivan, et al., filed 9 Apr. 2007, International Patent Application No. PCT/US2007/09255, entitled “Methods Of Depositing Material, Methods Of Making A Device, And Systems And Articles For Use In Depositing Material”, of Maria J, Anc, et al., filed 13 Apr. 2007, International Patent Application No. PCT/US2007/08705, entitled “Methods And Articles Including Nanomaterial”, of Seth Coe-Sullivan, et al, filed 9 Apr. 2007, and International Patent Application No. PCT/US2007/08721, entitled “Methods Of Depositing Nanomaterial & Methods Of Making A Device” of Marshall Cox, et al., filed 9 Apr. 2007, each of the foregoing patent applications being hereby incorporated herein by reference.
Due to the positioning of the quantum confined semiconductor nanoparticles in features or layers resulting from these deposition techniques, not all of the surfaces of the nanoparticles may be available to absorb and emit light.
In certain embodiments, quantum confined semiconductor nanoparticles can be deposited on a surface using contact printing. See, for example, A. Kumar and G. Whitesides, Applied Physics Letters, 63, 2002-2004, (1993); and V. Santhanam and R. P. Andres, Nano Letters, 4, 41-44, (2004), each of which is incorporated by reference in its entirety. See also U.S. patent application Ser. No. 11/253,612, filed 21 Oct. 2005, entitled “Method And System For Transferring A Patterned Material”, of Coe-Sullivan et al. and U.S. patent application Ser. No. 11/253,595, filed 21 Oct. 2005, entitled “Light Emitting Device Including Semiconductor Nanocrystals,” of Coe-Sullivan, each of which is incorporated herein by reference in its entirety.
This technique can be use for depositing a various thicknesses of quantum confined semiconductor nanoparticles. In certain embodiments the thickness is selected to achieve the desired % absorption thereby. Examples of desired % absorptions can include, without limitation, from about 0.1% to about 50%, from about 10% to about 40%, from about 10% to about 35%, from about 10% to about 30%. Preferably, the quantum confined semiconductor nanoparticles absorb at least a portion of impinging light and reemit at least a portion of the absorbed light energy as one or more photons of a predetermined wavelength(s). Most preferably, the quantum confined semiconductor nanoparticles do not absorb any, or absorb only negligible amounts of, the re-emitted photons.
In certain embodiments, methods for applying a material (e.g., an optical material) to a predefined region on a substrate (e.g., light guide plate) may be desirable. The predefined region is a region on the substrate where the material is selectively applied. The material and substrate can be chosen such that the material remains substantially entirely within the predetermined area. By selecting a predefined region that forms a pattern, material can be applied to the substrate such that the material forms a pattern. The pattern can be a regular pattern (such as an array, or a series of lines), or an irregular pattern. Once a pattern of material is formed on the substrate, the substrate can have a region including the material (the predefined region) and a region substantially free of material. In some circumstances, the material forms a monolayer on the substrate. The predefined region can be a discontinuous region. In other words, when the material is applied to the predefined region of the substrate, locations including the material can be separated by other locations that are substantially free of the material.
Quantum confined semiconductor nanoparticles can alternatively be deposited by solution based processing techniques, phase-separation, spin casting, ink-jet printing, silk-screening, and other liquid film techniques available for forming patterns on a surface.
Alternatively, quantum confined semiconductor nanoparticles can be dispersed in a light-transmissive material (e.g., a polymer, a resin, a silica glass, or a silica gel, etc.), which is preferably at least partially light-transmissive, and more preferably transparent, to the light emitted by the quantum confined semiconductor nanoparticles and in which quantum confined semiconductor nanoparticles can be dispersed) that is deposited as a full or partial layer or in a patterned arrangement by any of the above-listed or other known techniques. Suitable materials include many inexpensive and commonly available materials, such as polystyrene, epoxy, polyimides, and silica glass. After application to the surface, such material may contain a dispersion of quantum confined semiconductor nanoparticles where the nanoparticles have been size selected so as to produce light of a given color. Other configurations of quantum confined semiconductor nanoparticles disposed in a material, such as, for example, a two-dimensional layer on a substrate with a polymer overcoating are also contemplated. In certain embodiments in which quantum confined semiconductor nanoparticles are dispersed in a host material and applied as a layer on a surface of the light guide plate, the refractive index of the layer including the quantum confined semiconductor nanoparticles can have a refractive index that is greater than or equal to the refractive index of the light guide plate.
In certain embodiments in which the quantum confined semiconductor nanoparticles are dispersed in a host material and applied as a layer on a surface of the light guide plate, the refractive index of the layer including the quantum confined semiconductor nanoparticles can have a refractive index that is less than the refractive index of the light guide plate.
In certain embodiments, a reflective material can be applied to a surface of the light guide plate opposite that on which a layer including quantum confined semiconductor nanoparticles is disposed to enhance internal reflections of light within the light guide plate.
In embodiment of the invention including a layer comprising quantum confined semiconductor nanoparticles on a surface of the light guide plate, the optical component can optionally further include a cover, coating or layer over at least the portion of the surface upon which the layer comprising quantum confined semiconductor nanoparticles are disposed for protection from the environment (e.g., dust, moisture, and the like) and/or scratching or abrasion.
In certain embodiments, an optical component can further include a lens, prismatic surface, grating, etc. on the surface thereof from which light is emitted. Other coatings can also optionally be included on such surface.
U.S. Patent Application No. 61/016,227 of Seth Coe-Sullivan et al. for “Compositions, Optical Component, System Including An Optical Components, and Devices”, filed 21 Dec. 2007 is hereby incorporated herein by reference in its entirety.
As used herein, “top”, “bottom”, “over”, and “under” are relative positional terms, based upon a location from a reference point. More particularly, “top” means farthest away from a reference point, while “bottom” means closest to the reference point. Where, e.g., a layer is described as disposed or deposited “over” a component or substrate, the layer is disposed farther away from the component or substrate. There may be other layers between the layer and component or substrate. As used herein, “cover” is also a relative position term, based upon a location from a reference point. For example, where a first material is described as covering a second material, the first material is disposed over, but not necessarily in contact with the second material.
As used herein, the singular forms “a”, “an” and “the” include plural unless the context clearly dictates otherwise. Thus, for example, reference to an emissive material includes reference to one or more of such materials.
Applicants specifically incorporate the entire contents of all cited references in this disclosure. Further, when an amount, concentration, or other value or parameter is given as either a range, preferred range, or a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. Where a range of numerical values is recited herein, unless otherwise stated, the range is intended to include the endpoints thereof, and all integers and fractions within the range. It is not intended that the scope of the invention be limited to the specific values recited when defining a range.
Other embodiments of the present invention will be apparent to those skilled in the art from consideration of the present specification and practice of the present invention disclosed herein. It is intended that the present specification and examples be considered as exemplary only with a true scope and spirit of the invention being indicated by the following claims and equivalents thereof.
This application is a continuation of commonly owned International Application No. PCT/US2009/002796 filed 6 May 2009, which was published in the English language as PCT Publication No. WO2009/137053 on 12 Nov. 2009, which International Application claims priority to U.S. Application No. 61/050,929, filed 6 May 2008, each of the foregoing hereby being incorporated herein by reference in its entirety.
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