Patent Application
20240172556
The present invention relates to organic electric element using organic compound for organic electric element and electronic device thereof.
In general, an organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material. An organic electric element utilizing the organic light emitting phenomenon usually has a structure including an anode, a cathode, and an organic material layer interposed therebetween. Here the organic material layer has a multi-layered structure having respectively different materials in order to improve efficiency and stability of an organic electric element, and for example, may include a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, or the like.
The most important issues in organic electroluminescent element are life and efficiency, and as the display becomes larger, these efficiency and life problems must be solved.
Efficiency, life span, driving voltage, and the like are correlated with each other. If efficiency is increased, then driving voltage is relatively lowered, and the crystallization of an organic material due to Joule heating generated during operation is reduced as driving voltage is lowered, as a result of which life span shows a tendency to increase.
However, efficiency cannot be maximized only by simply improving the organic material layer. This is because long life span and high efficiency can be simultaneously achieved when energy levels and T1 values among the respective layers included in the organic material layer, inherent material properties (mobility, interfacial properties, etc.) and the like are optimal combination.
Therefore, the compound for a hole transport band layer and the compound for the electron transport band layer need to be used in proper combination in order to improve the luminous efficiency and lifetime while lowering the driving voltage of the organic electric element.
The object of the present invention is to provide an organic electric element using compounds used in a hole transport band layer and an electron transport band layer in an appropriate combination to lower the driving voltage of the element and improve the luminous efficiency and lifespan of the element, and an electronic device thereof.
In an aspect of the present invention, the present invention provides an organic electric element in which compound represented by Formula 1 is used for a hole transport band layer and compound represented by Formula 2 is used for an electron transport band layer.
In another aspect of the present invention, the present invention provides an electronic device including the organic electric element.
By appropriately combining the compounds used in a hole transport band layer and an electron transport band layer, the driving voltage of an organic electric element can be lowered and the luminous efficiency and lifespan of the element can be improved.
Unless otherwise stated, the term “aryl group” or “arylene group” as used herein has, but not limited to, 6 to 60 carbon atoms. The aryl group or arylene group in the present invention may comprise a monocyclic ring, ring assemblies, a fused polycyclic system, spiro compound and the like.
As used herein, the term “fluorenyl group” refers to a substituted or unsubstituted fluorenyl group, and “fluorenylene group” refers to a substituted or unsubstituted fluorenylene group. The fluorenyl group or fluorenylene group used in the present invention comprises a spiro compound formed by combining R and R′ with each other in the following structure, and also comprises compound formed by linking adjacent R″s to each other. “Substituted fluorenyl group”, “substituted fluorenylene group” means that at least one of R, R′, R″ in the following structure is a substituent other than hydrogen, and R″ may be 1 to 8 in the following formula. In this specification, a fluorene group and a fluorenylene group may be referred to as a fluorene group or fluorene regardless of the valence.
The term “spiro compound” as used herein has a spiro union which means union having one atom as the only common member of two rings. The common atom is designated as ‘spiro atom’. The compounds are defined as ‘monospiro-’, ‘dispiro-’ or ‘trispiro-’ depending on the number of spiro atoms in one compound.
The term “heterocyclic group” used in the specification comprises a non-aromatic ring as well as an aromatic ring like “heteroaryl group” or “heteroarylene group”. Unless otherwise stated, the term “heterocyclic group” means, but not limited to, a ring containing one or more heteroatoms and having 2 to 60 carbon atoms. Unless otherwise stated, the term “heteroatom” as used herein represents, for example, N, O, S, P or Si and may comprise a heteroatom group such as SO2, P═O etc. instead of carbon forming a ring such as the following compound. In the specification, “heterocyclic group” comprises a monocyclic, ring assemblies, fused polycyclic system, a spiro-compound and the like.
The term “aliphatic ring group” as used herein refers to a cyclic hydrocarbon except for aromatic hydrocarbons, and comprises a monocyclic ring, ring assemblies, a fused polycyclic system, a spiro-compound and the like, and unless otherwise specified, it means a ring of 3 to 60 carbon atoms, but not limited thereto. For example, a fused ring of benzene and cyclohexane corresponds to aliphatic ring group, wherein benzene is an aromatic ring and cyclohexane is a non-aromatic ring.
In this specification, a ‘group name’ corresponding to an aryl group, an arylene group, a heterocyclic group, and the like exemplified for each symbol and its substituent may be written in the name of functional group reflecting the valence, and may also be described as the name of a parent compound. For example, in the case of phenanthrene which is a kind of aryl group, it may be described by distinguishing valence such as ‘phenanthryl (group)’ when it is ‘monovalent group’, and ‘phenanthrylene (group)’ when it is ‘divalent group’, and it may also be described as a parent compound name, ‘phenanthrene’, regardless of its valence. Similarly, in the case of pyrimidine, it may be described as ‘pyrimidine’ regardless of its valence, and it may also be described as the name of corresponding functional group such as pyrimidinyl (group) when it is ‘monovalent group’, and ‘pyrimidylene (group)’ when it is ‘divalent group’.
In addition, in the present specification, the numbers and alphabets indicating a position may be omitted when describing a compound name or a substituent name. For example, pyrido[4,3-d]pyrimidine, benzofuro[2,3-d]pyrimidine and 9,9-dimethyl-9H-fluorene can be described as pyridopyrimidine, benzofuropyrimidine and dimethylfluorene, respectively. Therefore, both benzo[g]quinoxaline and benzo[f]quinoxaline can be described as benzoquinoxaline.
In addition, unless otherwise expressed, where any formula of the present invention is represented by the following formula, the substituent according to the index may be defined as follows.
In the above formula, where a is an integer of zero, the substituent R1 is absent, that is, hydrogen atoms are bonded to all the carbon constituting the benzene ring. Here, chemical formulas or compounds may be written without explicitly describing the hydrogen. In addition, one substituent R1 is bonded to any carbon of the carbons forming the benzene ring when “a” is an integer of 1. Similarly, where “a” is an integer of 2 or 3, substituents R1s may be bonded to the carbon of the benzene ring, for example, as followings. Also, where “a” is an integer of 4 to 6, substituents R1s are bonded to the carbon of the benzene ring in a similar manner. Further, where “a” is an integer of 2 or more, R1s may be the same or different from each other.
In addition, unless otherwise specified in the present specification, when referring to a condensed/fused ring, the number in the ‘number-condensed/fused ring’ indicates the number of condensed/fused rings. For example, a form in which three rings are condensed/fused with each other, such as anthracene, phenanthrene, and benzoquinazoline, may be represented by a 3-condensed/fused ring.
In addition, unless otherwise described herein, in the case of expressing a ring in the form of a ‘number-membered’ such as a 5-membered ring or a 6-membered ring, the number in the ‘number-membered’ represents the number of atoms forming the ring. For example, thiophene or furan may correspond to a 5-membered ring, and benzene or pyridine may correspond to a 6-membered ring.
In addition, unless otherwise specified in the present specification, when adjacent groups are linked to each other to form a ring, the ring may be selected from the group consisting of a C6-C60 aromatic ring group, a fluorenyl group, a C2-C60 heterocyclic group containing at least one heteroatom selected from the group consisting of O, N, S, Si and P, and a C3-C60 aliphatic ring.
Unless otherwise stated, the term “between adjacent groups”, for example, in case of the following Formulas, comprises not only “between R1 and R2”, “between R2 and R3”, “between R3 and R4”, “between R5 and R6”, but also “between R7 and R8” sharing one carbon, and may comprise “between substituents” attached to atom(carbon or nitrogen) consisting different ring, such as “between R1 and R7”, “between R1 and R8”, or “between R4 and R8” and the like. That is, where there are substituents bonded to adjacent elements constituting the same ring, the substituents may be correspond “adjacent groups”, and even if there are no adjacent substituents on the same ring, substituents attached to the adjacent ring may correspond to “adjacent groups”. In the following Formula, when the substituents bonded to the same carbon, such as R7 and R5, are linked to each other to form a ring, a compound containing a spiro-moiety may be formed.
In addition, in the present specification, the expression ‘adjacent groups may be linked to each other to form a ring’ is used in the same sense as ‘adjacent groups are linked selectively to each other to form a ring’, and a case where at least one pair of adjacent groups may be bonded to each other to form a ring.
In addition, unless otherwise specified in the present specification, an aryl group, an arylene group, a fluorenyl group, a fluorenylene group, a heterocyclic group, an aliphatic ring group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxyl group, an aryloxyl group, and a ring formed by adjacent groups may be each optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, an amino group unsubstituted or substituted with a C1-C20 alkyl group or a C6-C20 aryl group, a silane group unsubstituted or substituted with a C1-C20 alkyl group or a C6-C20 aryl group, a phosphine oxide group unsubstituted or substituted with a C1-C20 alkyl group or a C6-C20 aryl group, siloxane group, a cyano group, a nitro group, a C1-C20 alkylthio group, a C1-C20 alkoxyl group, a C6-C20 aryloxy group, a C6-C20 arylthio group, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C6-C20 aryl group, a fluorenyl group, a C2-C20 heterocyclic group containing at least one heteroatom of O, N, S, Si and P, and a C3-C20 aliphatic ring group.
Hereinafter, referring to
In designation of reference numerals to components in respective drawings, it should be noted that the same elements will be designated by the same reference numerals although they are shown in different drawings. In addition, in the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
Terms, such as first, second, A, B, (a), (b) or the like may be used herein when describing components of the present invention. Each of these terminologies is not used for defining an essence, order or sequence of a corresponding component but used merely to distinguish the corresponding component from other component(s). It will be understood that the expression ‘one component is “connected,” “coupled” or “joined” to another component’ comprises the case where a third component may be “connected,” “coupled” or “joined” between a first component and a second component as well as the case where the first component may be directly connected, coupled or joined to the second component.
In addition, it will be understood that when an element such as a layer, film, region or substrate is referred to as being “on” or “over” another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present.
The
Referring to the
The first electrode 110 may be an anode (positive electrode), and the second electrode 170 may be a cathode (negative electrode). In the case of an inverted organic electric element, the first electrode may be a cathode, and the second electrode may be an anode.
The organic material layer may be comprised a hole injection layer 120, a hole transport layer 130, a light emitting layer 140, an electron transport layer 150, and an electron injection layer 160. Specifically, a hole injection layer 120, a hole transport layer 130, a light emitting layer 140, an electron transport layer 150, and an electron injection layer 160 may be formed on the first electrode 110 in sequence.
Preferably, a layer for improving the luminous efficiency 180 may be formed one side of sides of the first electrode 110 and the second electrode 170, wherein one side is not facing the organic material layer, as a result the luminous efficiency of an organic electric element can be improved.
For example, the light efficiency improving layer 180 may be formed on the second electrode 170, as a result, in the case of a top emission organic light emitting element, the optical energy loss due to Surface Plasmon Polaritons (SPPs) at the second electrode 170 may be reduced and in the case of a bottom emission organic light emitting element, the light efficiency improving layer 180 may serve as a buffer for the second electrode 170.
A buffer layer 210 or an emission-auxiliary layer 220 may be further formed between the hole transport layer 130 and the light emitting layer 140, which will be described with reference to
Referring to
Although not shown in
In addition, according to another embodiment of the present invention, the organic material layer may be a form consisting of multiple stacks, wherein the stacks comprise a hole transport layer, a light emitting layer, and an electron transport layer, respectively. This will be described with reference to
Referring to
Specifically, the organic electric element according to the embodiment of the present invention may comprise a first electrode 110, a first stack ST1, a charge generation layer CGL, a second stack ST2, and a second electrode 170 and a layer for improving light efficiency 180.
The first stack ST1 is an organic layer formed on the first electrode 110, and the first stack ST1 may comprise the first hole injection layer 320, the first hole transport layer 330, the first light emitting layer 340 and the first electron transport layer 350 and the second stack ST2 may comprise a second hole injection layer 420, a second hole transport layer 430, a second light emitting layer 440 and a second electron transport layer 450. As such, the first stack and the second stack may be the organic layers having the same or different stacked structures.
The charge generation layer CGL may be formed between the first stack ST1 and the second stack ST2. The charge generation layer CGL may comprise a first charge generation layer 360 and a second charge generation layer 361. The charge generating layer CGL is formed between the first light emitting layer 340 and the second light emitting layer 440 to increase the current efficiency generated in each light emitting layer and to smoothly distribute charges.
The first light emitting layer 340 may comprise a light emitting material comprising a blue host doped with a blue fluorescent dopant and the second light emitting layer 440 may comprise a light emitting material comprising a green host doped with a greenish yellow dopant and a red dopant together, but the material of the first light emitting layer 340 and the second light emitting layer 440 according to an embodiment of the present invention is not limited thereto.
In
When multiple light emitting layers are formed in a multi-layer stack structure as shown in
Compound represented by Formula 1 may be used for a hole transport band layer and compound represented by Formula 2 is used for an electron transport band layer. Here, a hole transport band layer is an organic layer between a first electrode and a light-emitting layer and includes a hole injection layer 120, 320, 420, a hole transport layer 130, 330, 430, a buffer layer 210, and an emission-auxiliary layer 220, and an electron transport band layer is an organic material layer between a second electrode and a light emitting layer and may include an electron transport auxiliary layer(a hole blocking layer), an electron transport layer 150, 350, 450, and an electron injection layer 160.
Preferably, compound represented by Formula 1 of the present invention is included in a hole transport layer 130, 330, 430 or an emission-auxiliary layer 220, and more preferably is included in an emission-auxiliary layer 220, and compound represented by Formula 2 can be used in the electron transport auxiliary layer or electron transport layer 150, 350, 450.
Even if the cores of compounds are identical or similar to each other, the band gap, the electrical characteristics, the interface characteristics and the like may be different depending on which substituent is bonded at which position. Therefore, it is necessary to study the selection of the core and the combination with sub-substituent bonded to the core. In particular, long life span and high efficiency can be simultaneously achieved when the optimal combination of energy levels and T1 values, inherent material properties (mobility, interfacial properties, etc.), and the like among the respective layers of an organic material layer is achieved.
Therefore, the energy level and T1 value between the respective layers of the organic material layer, inherent material properties (mobility, interfacial properties, etc.) and the like can be optimized by using compound represented by Formula 1 for a hole transport band layer and compound represented by Formula 2 for an electron transport band layer.
The organic electric element according to an embodiment of the present invention may be manufactured using various deposition methods. The organic electric element according to an embodiment of the present invention may be manufactured using a PVD (physical vapor deposition) method or CVD (chemical vapor deposition) method. For example, the organic electric element may be manufactured by depositing a metal, a conductive metal oxide, or a mixture thereof on the substrate to form the anode 110, forming the organic material layer comprising the hole injection layer 120, the hole transport layer 130, the light emitting layer 140, the electron transport layer 150, and the electron injection layer 160 thereon, and then depositing a material, which can be used as the cathode 170, thereon. Also, an emission-auxiliary layer 220 may be formed between a hole transport layer 130 and a light emitting layer 140, and an electron transport auxiliary layer(not shown) may be further formed between a light emitting layer 140 and an electron transport layer 150 and, as described above, a stack structure may be formed.
Also, the organic material layer may be manufactured in such a manner that the fewer layers are formed using various polymer materials by a soluble process or solvent process, for example, spin coating, nozzle printing, inkjet printing, slot coating, dip coating, roll-to-roll, doctor blading, screen printing, or thermal transfer, instead of deposition. Since the organic material layer according to the present invention may be formed in various ways, the scope of protection of the present invention is not limited by a method of forming the organic material layer.
The organic electric element according to an embodiment of the present invention may be of a top emission type, a bottom emission type, or a dual emission type depending on the material used.
In addition, the organic electric element according to an embodiment of the present invention may be selected from the group consisting of an organic electroluminescent element, an organic solar cell, an organic photo conductor, an organic transistor, an element for monochromatic illumination and an element for a quantum dot display.
Another embodiment of the present invention provides an electronic device including a display device which includes the above described organic electric element, and a control unit for controlling the display device. Here, the electronic device may be a wired/wireless communication terminal which is currently used or will be used in the future, and covers all kinds of electronic devices including a mobile communication terminal such as a cellular phone, a personal digital assistant (PDA), an electronic dictionary, a point-to-multipoint (PMP), a remote controller, a navigation unit, a game player, various kinds of TVs, and various kinds of computers.
Hereinafter, an organic electric element according to one aspect of the present invention will be described.
An organic electric element according to one aspect of the present invention includes a first electrode, a second electrode, and an organic material layer formed between the first electrode and the second electrode, the organic material layer includes a light-emitting layer, a hole transport band layer formed between the light-emitting layer and the first electrode, and an electron transport band layer formed between the light-emitting layer and the second electrode, the hole transport band layer includes compound represented by the following Formula 1, and the electron transport band layer includes compound represented by the following Formula 2.
In Formulas, each of symbols may be defined as follows.
The term ‘adjacent groups’ may mean, for example, adjacent R1s or adjacent R2s. When a ring is formed by at least one pair of adjacent groups, the ring may be selected from the group consisting of a C6-C60 aromatic ring group, a fluorene group, a C2-C60 heterocyclic group containing at least one heteroatom of O, N, S, Si and P, and a C3-C60 aliphatic ring group.
When an aromatic ring group is formed by adjacent groups, the aromatic ring group may be a C6-C30, a C6-C20, a C6-C16, a C6-C14, a C6-C10 or a C6 aromatic ring group, specifically, benzene, naphthalene, phenanthrene or the like.
When at least one of Ar1 to Ar5, R1, R2, R1, Ra and Rb is an aryl group, the aryl group may be, for example, a C6-C30, a C6-C29, a C6-C28, a C6-C27, a C6-C26, a C6-C25, a C6-C24, a C6-C23, a C6-C22, a C6-C21, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17, or a C18 aryl group, specifically, phenyl, biphenyl, naphthyl, terphenyl, phenanthrene, triphenylene, or the like.
When at least one of L1 to L6 and L′ is an arylene group, the arylene group may be, for example, a C6-C30, a C6-C29, a C6-C28, a C6-C27, a C6-C26, a C6-C25, a C6-C24, a C6-C23, a C6-C22, a C6-C21, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17, a C18 aryl group, specifically, phenylene, biphenyl, naphthylene, terphenyl, phenanthrene, triphenylene, or the like.
When at least one of Ar1 to Ar5, R1, R2, R1, Ra, Rb, L1 to L6 and L′ is a heterocyclic group, the heterocyclic group may be, for example, a C2-C30, a C2-C29, a C2-C28, a C2-C27, a C2-C26, a C2-C25, a C2-C24, a C2-C23, a C2-C22, a C2-C21, a C2-C20, a C2-C19, a C2-C18, a C2-C17, a C2-C16, a C2-C15, a C2-C14, a C2-C13, a C2-C12, a C2-C11, a C2-C10, a C2-C9, a C2-C8, a C2-C7, a C2-C6, a C2-C5, a C2-C4, a C2-C3, a C2, a C3, a C4, a C5, a C6, a C7, a C8, a C9, a C10, a C11, a C12, a C13, a C14, a C15, a C16, a C17, a C18, a C19, a C20, a C21, a C22, a C23, a C24, a C25, a C26, a C27, a C28, or a C29 heterocyclic group, specifically, pyridine, pyrimidine, pyrazine, pyridazine, triazine, furan, pyrrole, silole, indene, indole, phenyl-indole, benzoindole, phenyl-benzoindole, pyrazinoindol, quinoline, isoquinoline, benzoquinoline, pyridoquinoline, quinazoline, benzoquinazoline, dibenzoquinazoline, phenanthroquinazoline, quinoxaline, benzoquinoxaline, dibenzoquinoxaline, benzofuran, naphthobenzofuran, dibenzofuran, dinaphthofuran, thiophene, benzothiophene, dibenzothiophene, naphthobenzothiophene, dinaphthothiophene, carbazole, phenyl-carbazole, benzocarbazole, phenyl-benzocarbazole, naphthyl-benzocarbazole, dibenzocarbazole, indolocarbazole, benzofuropyridine, benzothienopyridine, benzofuropyridine, benzothienopyrimidine, benzofuropyrimidine, benzothienopyrazine, benzofuropyrazine, benzoimidazole, benzothiazole, benzooxazole, benzosiloe, phenanthroline, dihydro-phenylphenazine, 10-phenyl-10H-phenoxazine, phenoxazine, phenothiazine, dibenzodioxin, benzodibenzodioxin, thianthrene, 9,9-dimethyl-9H-xantene, 9,9-dimethyl-9H-thioxantene, dihydrodimethylphenylacridine, spiro[fluorene-9,9′-xanthene] and the like.
When at least one of Ar1 to Ar5, R1, R2, R1, Ra and Rb is a fluorenyl group or at least one of L1 to L6 and L′ is a fluorenylene group, the fluorenyl group or the fluorenylene group may be, for example, 9,9-dimethyl-9H-fluorene, 9,9-diphenyl-9H-fluorene, 9,9′-spirobifluorene, spiro[benzo[b]fluorene-11,9′-fluorene], benzo[b]fluorene, 11,11-diphenyl-11H-benzo[b]fluorene, 9-(naphthalen-2-yl)9-phenyl-9H-fluorene, and the like.
When at least one of Ar1 to Ar5, R1, R2, R1, Ra, Rb, L1 to L6 and L′ is an aliphatic ring group, the aliphatic ring group may be, for example, a C6-C30, a C6-C29, a C6-C28, a C6-C27, a C6-C26, a C6-C25, a C6-C24, a C6-C23, a C6-C22, a C6-C21, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17, a C18 aliphatic ring group, specifically, cyclohexane, adamantyl group, bicyclo[2.2.1]hept-2-ene, etc.
When at least one of R1 and R2 is an alkyl group, the alkyl group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3 and a C4 alkyl group, specifically, methyl, ethyl, propyl, t-butyl, etc.
When at least one of R1 and R2 is an alkenyl group, the alkenyl group may be, for example, a C2-C20, a C2-C10, a C2-C4, a C2, a C3, a C4 alkenyl group.
When at least one of R1 and R2 is an alkoxy group, the alkoxy group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkoxy group, specifically, a methoxy group, ethoxy group, butoxy group, etc.
The aryl group, the arylene group, the fluorenyl group, the fluorenylene group, the heterocyclic group, the aliphatic ring group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, and the ring formed by adjacent groups may be each optionally substituted with one or more substituents selected from the group consisting of deuterium, halogen, a silane group unsubstituted or substituted with a C1-C20 alkyl group or a C6-C20 aryl group, a phosphine oxide group unsubstituted or substituted with a C1-C20 alkyl group or a C6-C20 aryl group, siloxane group, a cyano group, a nitro group, a C1-C20 alkylthio group, a C1-C20 alkoxyl group, a C6-C20 aryloxy group, a C6-C20 arylthio group, a C1-C20 alkyl group, a C2-C20 alkenyl group, a C2-C20 alkynyl group, a C6-C20 aryl group, a fluorenyl group, a C2-C20 heterocyclic group containing at least one heteroatom of O, N, S, Si and P, and a C3-C20 aliphatic ring group.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with an aryl group, the aryl group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17 or a C18 aryl group.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with a heterocyclic group, the heterocyclic group may be, for example, a C2-C20, a C2-C19, a C2-C18, a C2-C17, a C2-C16, a C2-C15, a C2-C14, a C2-C13, a C2-C12, a C2-C11, a C2-C10, a C2-C9, a C2-C8, a C2-C7, a C2-C6, a C2-C5, a C2-C4, a C2-C3, a C2, a C3, a C4, a C5, a C6, a C7, a C8, a C9, a C10, a C11, a C12, a C13, a C14, a C15, a C16, a C17, a C18, a C19 or a C20 heterocyclic group.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with a fluorenyl group, the fluorenyl group may be 9-dimethyl-9H-fluorene, 9,9-diphenyl-9H-fluorene, 9,9′-spirobifluorene, spiro[benzo[b]fluorene-11,9′-fluorene], benzo[b]fluorene, 11,11-diphenyl-11H-benzo[b]fluorene, 9-(naphthalen-2-yl)9-phenyl-9H-fluorene, and the like.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with an alkyl group, the alkyl group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkoxy group.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with an alkoxy group, the alkoxy group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkoxy group.
When at least one of the aryl group, the fluorenyl group, the heterocyclic group, the aliphatic ring group, the aromatic ring group, the fluorene group, the alkyl group, the alkenyl group, the alkynyl group, the alkoxyl group, the aryloxyl group, the arylene group, the fluorenylene group, and the ring formed by adjacent groups is substituted with an aliphatic ring group, the aliphatic ring group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17 or a C18 aliphatic ring group.
In Formulas 1 and 2, at least one of Ar1 to Ar5 may be represented by one of the following Formulas Ar-1 to Ar-5.
In Formulas Ar-1 to Ar-5, each symbol may be defined as follows.
When the rings A to C are an aromatic ring group, the aromatic ring group may be, for example, C6-C30, C6-C29, C6-C28, C6-C27, C6-C26, C6-C25, C6-C24, C6-C23, C6-C22, C6-C21, C6-C20, C6-C19, C6-C18, C6-C17, C6-C16, C6-C15, C6-C14, C6-C13, C6-C12, C6-C11, C6-C10, C6, C10, C12, C13, C14, C15, C16, C17 or C18 aromatic ring group, specifically, phenylene, biphenyl, naphthylene, terphenyl, phenanthrene, triphenylene, etc.
When at least one of R3 to R13, R′, R″, Ar1, Ar2 is an aryl group, the aryl group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17 or a C18 aryl group.
When at least one of R3 to R13, R′, R″, Ar1, Ar2 is a heterocyclic group, the heterocyclic group may be, for example, a C2-C20, a C2-C19, a C2-C18, a C2-C17, a C2-C16, a
C2-C15, a C2-C14, a C2-C13, a C2-C12, a C2-C11, a C2-C10, a C2-C9, a C2-C8, a C2-C7, a C2-C6, a C2-C5, a C2-C4, a C2-C3, a C2, a C3, a C4, a C5, a C6, a C7, a C8, a C9, a C10, a C11, a C12, a C13, a C14, a C15, a C16, a C17, a C18, a C19 or a C20 heterocyclic group.
When at least one of R3 to R13, R′, R″, Ar1, Ar2 is a fluorenyl group, the fluorenyl group may be, for example, 9,9-dimethyl-9H-fluorene, 9,9-diphenyl-9H-fluorene, 9,9′-spirobifluorene, spiro[benzo[b]fluorene-11,9′-fluorene], benzo[b]fluorene, 11,11-diphenyl-11H-benzo[b]fluorene, 9-(naphthalen-2-yl)9-phenyl-9H-fluorene, and the like.
When at least one of R3 to R13, R′, R″, Ar1, Ar2 is an aliphatic ring group, the aliphatic ring group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17, a C18 aliphatic ring group.
When at least one of R1 and R2 is an alkyl group, the alkyl group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkyl group.
When at least one of R3 to R13, R′, R″ is an alkenyl group, the alkenyl group may be, for example, a C2-C20, a C2-C10, a C2-C4, a C2, a C3, a C4 alkenyl group.
When at least one of R3 to R13, R′, R″ is an alkoxy group, the alkoxy group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, C2, a C3, a C4 alkoxy group.
At least one of the rings A to C may be selected from the group consisting of Formula F-1 to Formula F-7 below.
The Formulas, * indicates the condensation position, R13 is the same as defined above, m is an integer of 0 to 3, n is an integer of 0 to 5, and o is an integer of 0 to 7.
In Formulas above, at least one of L1 to L6 may be selected from the group consisting of Formulas b-1 to b-13 below.
In Formula b-1 to Formula b-13, each symbol can be defined as follows.
When at least one of R8 to R10, R′, R″, Ar3 is an aryl group, the aryl group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-Cii, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17 or a C18 aryl group.
When at least one of R8 to R10, R′, R″, Ar3 is a heterocyclic group, the heterocyclic group may be, for example, a C2-C20, a C2-C19, a C2-C18, a C2-C17, a C2-C16, a C2-C15, a C2-C14, a C2-C13, a C2-C12, a C2-C11, a C2-C10, a C2-C9, a C2-C8, a C2-C7, a C2-C6, a C2-C5, a C2-C4, a C2-C3, a C2, a C3, a C4, a C5, a C6, a C7, a C8, a C9, a C10, a C11, a C12, a C13, a C14, a C15, a C16, a C17, a C18, a C19 or a C20 heterocyclic group.
When at least one of R8 to R10, R′, R″, Ar3 is a fluorenyl group, the fluorenyl group may be, for example, 9,9-dimethyl-9H-fluorene, 9,9-diphenyl-9H-fluorene, 9,9′-spirobifluorene, spiro[benzo[b]fluorene-11,9′-fluorene], benzo[b]fluorene, 11,11-diphenyl-11H-benzo[b]fluorene, 9-(naphthalen-2-yl)9-phenyl-9H-fluorene, and the like.
When at least one of R8 to R10, R′, R″, Ar3 is an aliphatic ring group, the aliphatic ring group may be, for example, a C6-C20, a C6-C19, a C6-C18, a C6-C17, a C6-C16, a C6-C15, a C6-C14, a C6-C13, a C6-C12, a C6-C11, a C6-C10, a C6, a C10, a C12, a C13, a C14, a C15, a C16, a C17, a C18 aliphatic ring group.
When at least one of R8 to R10, R′, R″ is an alkyl group, the alkyl group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkyl group.
When at least one of R8 to R10, R′, R″ is an alkenyl group, the alkenyl group may be, for example, a C2-C20, a C2-C10, a C2-C4, a C2, a C3, a C4 alkenyl group.
When at least one of R8 to R10, R′, R″ is an alkoxy group, the alkoxy group may be, for example, a C1-C20, a C1-C10, a C1-C4, a C1, a C2, a C3, a C4 alkoxy group.
Compound represented by Formula 1 may be represented by Formula 1-1 or Formula 1-2 below.
In Formula 1-1 and Formula 1-2, R1, R2, a, b, L1-L3, Ar1 and Ar2 are the same as defined in Formula 1.
Compound represented by Formula 1 may be one of the following compounds, but there is no limitation thereto.
Compound represented by Formula 2 may be one of the following compounds, but there is no limitation thereto.
Hereinafter, synthesis examples of compound represented by Formulas 1 and 2 according to the present invention, and preparation methods of an organic electric element will be described in detail by way of examples. However, the present invention is not limited to the following examples.
Compound (final product 1) represented by Formula 1 according to the present invention can be synthesized by reacting Sub 1A and Sub 1B as shown in Reaction Scheme 1 below, but is not limited thereto.
After Sub 2-1aa (50 g, 352.2 mmol) is dissolved in THF (1761 ml), Sub 1-1ab (68.9 g, 352.2 mmol), Pd(PPh3)4 (24.4 g, 21.1 mmol), NaOH (42.3 g, 1056.7 mmol) and water (881 ml) are added thereto and the reaction is carried out at 80° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 61.1 g (yield: 81.5%) of the product.
After dissolving Sub 1-1a (61.1 g, 287.1 mmol) by adding C6F6 (428 ml) and DMI (287 ml), Pd(OAc)2 (3.2 g, 14.4 mmol), 3-nitropyridine (1.8 g, 14.4 mmol) and tent-butyl peroxybenzoate (111.5 g, 574.1 mmol) are added thereto and the reaction is carried out at 90° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 42.0 g (yield: 69.8%) of the product.
After dissolving Sub 1-2aa (50.0 g, 265.9 mmol) in THF (1330 ml), Sub 1-1ab (52.0 g, 265.9 mmol), Pd(PPh3)4 (18.4 g, 16.0 mmol), NaOH (31.9 g, 797.7 mmol) and water (665 ml) are added thereto, and the synthesis was carried out in the same manner as the synthesis of Sub 1-1a to obtain 56.6 g (yield: 82.2%) of product.
After adding an excess amount of trifluoromethane-sulfonic acid to Sub 1-2a (56.6 g, 218.6 mmol), the solution is stirred at room temperature for 24 hours, then water and pyridine (8:1) are added thereto and the mixture is refluxed for 30 minutes. After cooling the resultant to room temperature, the resultant is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 46.2 g (yield: 93.7%) of the product.
After dissolving Sub 1-11aa (50.0 g, 225.1 mmol) in THF (1126 ml), Sub 1-1ab (44.0 g, 225.1 mmol), Pd(PPh3)4 (15.6 g, 13.5 mmol), NaOH (27.0 g, 675.4 mmol) and water (563 ml) are added thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 1-1a to obtain 53.3 g (yield: 80.8%) of product.
After dissolving Sub 1-11a (53.3 g, 181.9 mmol) by adding C6F6 (272 ml) and DMI (182 ml), Pd(OAc)2 (2.0 g, 9.1 mmol), 3-nitropyridine (1.1 g, 9.1 mmol) and tent-butyl peroxybenzoate (70.7 g, 363.8 mmol) are added thereto. Afterwards, the synthesis is carried out in the same manner as the synthesis of Sub 1-1 to obtain 37.5 g (yield: 71.1%) of product.
After dissolving Sub 1-63aa (50.0 g, 287.3 mmol) in THF (1437 ml), Sub 1-63ab (66.8 g, 287.3 mmol), Pd(PPh3)4 (19.9 g, 17.2 mmol), NaOH (34.5 g, 862.0 mmol) and water (718 ml) are added thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 1-1a to obtain 57.5 g (yield: 83.4%) of product.
After dissolving Sub 1-63a (67.5 g, 239.6 mmol) by adding C6F6 (358 ml) and DMI (240 ml), Pd(OAc)2 (2.7 g, 12.0 mmol), 3-nitropyridine (1.5 g, 12.0 mmol), tent-butyl peroxybenzoate (93.1 g, 479.3 mmol) are added thereto. Afterwards, the synthesis is carried out in the same manner as the synthesis of Sub 1-1 to obtain 45.8 g (yield: 68.3%) of product.
Compounds belonging to Sub 1 may be, but not limited to, the following compounds, and Table 1 shows FD-MS (Field Desorption-Mass Spectrometry) values of the following compounds.
Sub 1B of the Reaction Scheme 1 can be synthesized by the reaction route of Reaction Scheme 2, but there is no limitation thereto.
After dissolving Sub 2-6a (50.0 g, 295.5 mmol) in toluene (1477 ml), Sub 2-6b (65.3 g, 295.5 mmol), Pd2(dba)3 (8.1 g, 8.9 mmol), P(t-Bu)3 (3.6 g, 17.7 mmol) and NaOt-Bu (56.8 g, 590.9 mmol) are added thereto and the reaction is carried out at 80° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 78.6 g (yield: 73.6%) of the product.
After dissolving Sub 2-9a (50.0 g, 216.3 mmol) in toluene (1156 ml), Sub 2-9b (82.6 g, 231.1 mmol), Pd2(dba)3 (6.4 g, 6.9 mmol), P(t-Bu)3 (2.8 g, 13.9 mmol) and NaOt-Bu (44.4 g, 462.3 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 2-6 to obtain 92.0 g (yield: 72.4%) of product.
After dissolving Sub 2-26a (50.0 g, 280.5 mmol) in toluene (1402 ml), Sub 1-11 (78.5 g, 280.5 mmol), Pd2(dba)3 (7.7 g, 8.4 mmol), P(t-Bu)3 (3.4 g, 16.8 mmol), NaOt-Bu (53.9 g, 560.9 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 2-6 to obtain 83.2 g (yield: 68.7%) of product.
After dissolving Sub 2-26a (50.0 g, 280.5 mmol) in toluene (1402 ml), Sub 2-68b (103.5 g, 280.5 mmol), Pd2(dba)3 (7.7 g, 8.4 mmol), P(t-Bu)3 (3.4 g, 16.8 mmol), NaOt-Bu (53.9 g, 560.9 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 2-6 to obtain 102.8 g (yield: 70.0%) of product.
After dissolving Sub 2-6a (50.0 g, 295.5 mmol) in toluene (1477 ml), Sub 2-97b (101.3 g, 295.5 mmol), Pd2(dba)3 (8.1 g, 8.9 mmol), P(t-Bu)3 (3.6 g, 17.7 mmol), NaOt-Bu (56.8 g, 590.9 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 2-6 to obtain 102.6 g (yield: 71.2%) of product.
Compounds belonging to Sub 2 may be, but not limited to, the following compounds, and Table 2 shows FD-MS (Field Desorption-Mass Spectrometry) values of the following compounds.
After dissolving Sub 1-2 (10.0 g, 44.3 mmol) in toluene (221 ml), Sub 2-6 (15.5 g, 44.3 mmol), Pd2(dba)3 (1.2 g, 1.3 mmol), P(t-Bu)3 (0.5 g, 2.7 mmol), NaOt-Bu (8.5 g, 88.6 mmol) are added thereto and the reaction is carried out at 80° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 18.0 g (yield: 73.8%) of the product.
After dissolving Sub 1-1 (10.0 g, 47.7 mmol) in toluene (238 ml), Sub 2-9 (25.3 g, 47.7 mmol), Pd2(dba)3 (1.3 g, 1.4 mmol), P(t-Bu)3 (0.6 g, 2.9 mmol), NaOt-Bu (9.2 g, 95.4 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 24.3 g (yield: 70.5%) of product.
After dissolving Sub 1-11 (10.0 g, 34.5 mmol) in toluene (173 ml), Sub 2-26 (14.4 g, 34.5 mmol), Pd2(dba)3 (1.0 g, 1.0 mmol), P(t-Bu)3 (0.4 g, 2.1 mmol), NaOt-Bu (6.6 g, 69.0 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 17.1 g (yield: 72.4%) of product.
After dissolving Sub 1-1 (10.0 g, 47.7 mmol) in toluene (238 ml), Sub 2-37 (18.0 g, 47.7 mmol), Pd2(dba)3 (1.3 g, 1.4 mmol), P(t-Bu)3 (0.6 g, 2.9 mmol), NaOt-Bu (9.2 g, 95.4 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 18.8 g (yield: 70.2%) of product.
After dissolving Sub 1-2 (10.0 g, 44.3 mmol) in toluene (221 ml), Sub 2-56 (23.5 g, 44.3 mmol), Pd2(dba)3 (1.2 g, 1.3 mmol), P(t-Bu)3 (0.5 g, 2.7 mmol), NaOt-Bu (8.5 g, 88.6 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 23.8 g (yield: 72.6%) of product.
After dissolving Sub 1-1 (10.0 g, 47.7 mmol) in toluene (238 ml), Sub 2-68 (24.1 g, 47.7 mmol), Pd2(dba)3 (1.3 g, 1.4 mmol), P(t-Bu)3 (0.6 g, 2.9 mmol), NaOt-Bu (9.2 g, 95.4 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 23.2 g (yield: 69.8%) of product.
After dissolving Sub 1-63 (10.0 g, 35.7 mmol) in toluene (179 ml), Sub 2-97 (16.8 g, 35.7 mmol), Pd2(dba)3 (1.0 g, 1.1 mmol), P(t-Bu)3 (0.4 g, 2.1 mmol), NaOt-Bu (6.9 g, 71.5 mmol) are thereto, and the synthesis is carried out in the same manner as the synthesis of P-6 to obtain 18.6 g (yield: 71.1%) of product.
The FD-MS values of the compounds P-1 to P-104 of the present invention prepared according to the above synthesis examples are shown in Table 3 below.
Compound (final product 2) represented by Formula 2 of the present invention can be synthesized by the reaction route of Reaction Scheme 3 below, but is not limited thereto.
In the following Reaction Scheme 3, G1 is L5 or L6 of Formula 2, and G2 is Ar4 or Ar5.
A synthesis example of Sub 3 of Reaction Scheme 3 is as follows, but is not limited thereto.
After dissolving Sub 3-7a (50.0 g, 184.8 mmol) in THF (924 ml), Sub 3-7b (36.6 g, 184.8 mmol), Pd(PPh3)4 (12.8 g, 11.1 mmol), NaOH (22.2 g, 554.5 mmol) and water (462 ml) are added thereto and the reaction is carried out at 80° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 51.7 g (yield: 81.4%) of the product.
After dissolving Sub 3-27a (50.0 g, 169.2 mmol) in THF (846 ml), Sub 3-27b (59.4 g, 169.2 mmol), Pd(PPh3)4 (11.7 g, 10.2 mmol), NaOH (20.3 g, 507.6 mmol) and water (423 ml) are thereto, and the synthesis is carried out in the same manner as the synthesis of Sub 3-7 to obtain 71.1 g (yield: 80.5%) of product.
Compounds belonging to Sub 3 may be, but not limited to, the following compounds, and Table 4 shows FD-MS (Field Desorption-Mass Spectrometry) values of the following compounds.
After adding Sub 4b (34.0 g, 133.7 mmol), PdCl2(dppf) (2.7 g, 3.7 mmol), KOAc (35.8 g, 364.7 mmol) and DMF (608 ml) to Sub 4-26a (50.0 g, 121.6 mmol), the mixture is stirred and refluxed at 120° C. When the reaction is completed, the temperature of the reactant is cooled to room temperature, extracted with MC (methylene chloride), and washed with water. The organic layer was dried over MgSO4 and concentrated, and the concentrate was separated with a silica gel column to obtain 32.0 g (yield: 69.9%) of product.
Compounds belonging to Sub 4 may be, but not limited to, the following compounds, and Table 5 shows FD-MS (Field Desorption-Mass Spectrometry) values of the following compounds.
After dissolving Sub 3-1(10.0 g, 29.2 mmol) in THF (146 ml), Sub 4-1 (13.2 g, 29.2 mmol), Pd(PPh3)4 (2.0 g, 1.8 mmol), NaOH (3.5 g, 87.5 mmol) and water (73 ml) are added thereto and the reaction is carried out at 80° C. When the reaction is completed, the reaction product is extracted with CH2Cl2 and water, and then the organic layer is dried with MgSO4 and concentrated. Then, the concentrate is separated through a silica gel column and recrystallized to obtain 17.4 g (yield: 83.4%).
After dissolving Sub 3-7(10.0 g, 29.1 mmol) in THF (145 ml), Sub 4-10 (10.5 g, 29.1 mmol), Pd(PPh3)4 (2.0 g, 1.8 mmol), NaOH (3.5 g, 87.3 mmol) and water (73 ml) are thereto, and the synthesis is carried out in the same manner as the synthesis of E-1 to obtain 15.6 g (yield: 85.6%) of product.
After dissolving Sub 3-6(10.0 g, 27.1 mmol) in THF (136 ml), Sub 4-26 (10.2 g, 27.1 mmol), Pd(PPh3)4 (1.9 g, 1.6 mmol), NaOH (3.3 g, 81.3 mmol) and water (68 ml) are thereto, and the synthesis is carried out in the same manner as the synthesis of E-1 to obtain 14.6 g (yield: 80.9%) of product.
After dissolving Sub 3-8(10.0 g, 37.4 mmol) in THF (187 ml), Sub 4-46 (6.9 g, 18.7 mmol), Pd(PPh3)4 (2.6 g, 2.2 mmol), NaOH (4.5 g, 112.1 mmol) and water (93 ml) are thereto, and the synthesis is carried out in the same manner as the synthesis of E-1 to obtain 21.0 g (yield: 75.8%) of product.
After dissolving Sub 3-25(10.0 g, 37.2 mmol) in THF (186 ml), Sub 4-53(14.9 g, 37.2 mmol), Pd(PPh3)4 (2.6 g, 2.2 mmol), NaOH (4.5 g, 111.6 mmol) and water (93 ml) are thereto, and the synthesis is carried out in the same manner as the synthesis of E-1 to obtain 17.7 g (yield: 81.1%) of product.
The FD-MS values of the compounds E-1 to E-80 of the present invention prepared according to the above synthesis examples are shown in Table 6 below.
After vacuum-depositing 4,4′,4″-tris[2-naphthyl(phenyl)amino]triphenylamine (hereinafter abbreviated as “2-TNATA”) on an ITO layer (anode) formed on a glass substrate to form a hole injection layer of 60 nm thickness, a hole transport layer of 60 nm thickness was formed by vacuum-depositing N,N′ -bis(1-naphthalenyl)-N,N′ -bis-phenyl-(1,1′-biphenyl)-4,4′-diamine (hereinafter abbreviated as “NPB”) on the hole injection layer.
Subsequently, an emission-auxiliary layer of 20 nm thickness was formed by vacuum-depositing the compound P-6 of the present invention on the hole transport layer and 4,4′-N,N′-dicarbazole-biphenyl(hereinafter abbreviated as “CBP”) as a host material and tris(2-phenylpyridine)-iridium (hereinafter abbreviated as “Ir(ppy)3) as a dopant material in a weight ratio of 95:5 were deposited on the emission-auxiliary layer to form a light emitting layer of 30 nm thickness.
Next, (1,1′-bisphenyl-4-olato)bis(2-methyl-8-quinolinolato)aluminum (hereinafter abbreviated as “BAlq”) was vacuum-deposited to form a hole blocking layer of 10 nm thickness on the light emitting layer, and the compound E-14 of the present invention was vacuum-deposited to form an electron transport layer of 40 nm thickness on the hole blocking layer. Thereafter, LiF was deposited to form an electron injection layer of 0.2 nm thickness, and then Al was deposited to form a cathode of 150 nm thickness.
The organic electroluminescent elements were fabricated in the same manner as described in Test Example 1 except that the compounds of the present invention described in the following Table 7 were used as material of an emission-auxiliary layer and an electron injection layer.
The organic electroluminescent elements were fabricated in the same manner as described in Test Example 1 except that the compounds of the present invention described in the following Table 7 were used as material of an emission-auxiliary layer and an electron injection layer.
Electroluminescence (EL) characteristics were measured with PR-650 (Photoresearch) by applying a forward bias DC voltage to the organic electroluminescent elements prepared in Test Examples 1 to 28 of the present invention and Comparative Examples 1 to 7. T95 life time was measured using a life time measuring apparatus manufactured by mc science Inc. at reference brightness of 5000 cd/m2. The measurement results are shown in Tables 7 below.
As can be seen from the result in Table 7, when the compound represented by Formula 1 is used as an emission auxiliary layer material and the compound represented by Formula 2 is used as the electron transport layer material, compared to the case of using the compounds of Comparative Examples 1 to 7, the driving voltage of the organic electroluminescent element is lowered, and the luminous efficiency and lifespan are significantly improved.
Comparative Example 1 is a case where Comparative compound 1 is used as an emission auxiliary layer material and Comparative compound 4 is used as the electron transport layer material. Compared to Comparative Example 1, in Comparative Examples 2 to 7 in which the compound of the present invention is used as either an emission auxiliary layer material or the electron transport layer material, the driving voltage, efficiency and lifespan are improved.
Comparative Compound 1 and Comparative Compound 2 are similar to compound of the present invention in that an amine group is substituted at position 1 of the dibenzofuran or dibenzothiophene moiety, but compound of Formula 1 of the present invention differs from Comparative compound 1 or 2 in that dibenzofuran or dibenzothiophene moiety are substituted with one or more deuteriums.
When using compound represented by Formula 1 of the present invention in a hole transport band, wherein the compound is necessarily substituted with deuterium, the volume of molecular core is reduced. This is because the zero-point energy, that is, the energy of the ground state, is lower compared to compounds in which deuterium is not substituted, and the bond length of carbon and deuterium is shorter than that of carbon and hydrogen. Therefore, electrical polarizability can be reduced, and intermolecular interaction can be weakened, thereby increasing the thin film volume. These characteristics have the effect of lowering the crystallinity of the thin film, that is, creating an amorphous state.
This characteristic has the effect of lowering the crystallinity of the thin film, that is, creating an amorphous state. This amorphous state can let the flow of charge, that is, hole mobility fast by reducing grain boundaries due to isotropic and homogeneous characteristics
Additionally, when compound represented by Formula 2 is used in the electron transport band, electrons are injected into the light-emitting layer more quickly than Comparative compound 4.
Therefore, when compound represented by Formula 1 is used in the hole transport band and compound represented by Formula 2 is used in the electron transport band, holes and electrons are injected into the light-emitting layer more quickly, thereby improving the charge balance in the light-emitting layer. As a result, the characteristics of an organic electric element can be improved.
In addition, some electrons may pass from the emitting layer to the hole transport region. Stability of the compound increases by increasing the bond dissociation energy (BDE) of Compound represented by Formula 1, wherein the compound is substituted with deuterium. As a result, it appears that the lifespan of an organic electric element is improved.
Comparative compound 3 is similar to the compound of the present invention in that it is a tertiary amine substituted with deuterium-substituted dibenzofuran. However, Comparative compound 3 differs from the present invention in the position where the amine group is substituted. In compound of the present invention, an amine group is substituted at position 1 of dibenzofuran, whereas in Comparative compound 3, an amine group is substituted at position 4 of dibenzofuran.
When an amine group is substituted at position 1 of dibenzofuran or dibenzothiophene, the band gap between the HOMO and LUMO of the molecule is widened due to steric hindrance, and T1 energy level is higher and an amine group has a better shielding effect than when substituted at other positions. As a result, it appears that the efficiency and lifespan of compound of the present invention are significantly improved compared to Comparative compound 3.
In conclusion, when compound of the present invention represented by Formula 1 is used as an emission auxiliary layer and compound of the present invention represented by Formula 2 is used as an electron transport layer, more holes and electrons move quickly and easily into the light-emitting layer. As a result, the charge balance in the light-emitting layer increases and light is emitted from within the light-emitting layer rather than at the interface of an emission auxiliary layer, and deterioration at the interface between ITO and a hole transport layer is also reduced. As a result, it can be seen that the driving voltage, efficiency, and lifespan of the entire element are improved.
Although the exemplary embodiments of the present invention have been described for illustrative purposes, those skilled in the art to which the present invention pertains will be capable of various modifications without departing from the essential characteristics of the present invention. Therefore, the embodiment disclosed herein is intended to illustrate the present invention rather than to limit the present invention and the scope of the present invention is not limited by the embodiments. The scope of the present invention shall be construed on the basis of the accompanying claims, and it shall be construed that all of the technical ideas included within the scope equivalent to the claims belong to the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2021-0030243 | Mar 2021 | KR | national |
| 1020210030243 | Mar 2021 | KR | national |
This application claims benefit under 35 U.S.C. 119, 120, 121, or 365(c), and is a National Stage entry from International Application No. PCT/KR2022/002487 filed on Feb. 21, 2022, which claims priority to the benefit of Korean Patent Application No. 10-2021-0030243 filed in the Korean Intellectual Property Office on Mar. 8, 2021, the entire contents of which are incorporated herein by reference.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/KR2022/002487 | 2/21/2022 | WO |
