Claims
- 1. A light emitting device comprising:a package having a cavity which is formed by side-walls of said package; and a light emitting chip disposed on a surface at the base of the cavity; wherein, a layer including light scattering material is formed at least over upper surfaces of the side-walls of said package, and wherein a film thickness of the layer including the light scattering material is less than a particle diameter of the light scattering material, and at least a surface of the layer including the light scattering material formed over the upper surfaces of the side-walls of said package has protrusions that follow the topology of the light scattering material.
- 2. The light emitting device according to claim 1, wherein the light scattering material includes at least one of fluorescent material and pigment.
- 3. The light emitting device according to claim 2, wherein the light scattering material is made up of at least one of the fluorescent material and the pigment covered with transparent material.
- 4. The light emitting device according to claim 3, wherein the transparent material is made of organic material.
- 5. The light emitting device according to claim 2, wherein the fluorescent material is a yttrium-aluminum oxide family of fluorescent materials.
- 6. The light emitting device according to claim 2, wherein the fluorescent material is selected from the group consisting of a yttrium-aluminum oxide family of fluorescent materials and a fluorescent material wherein part or all of the yttrium in the yttrium-aluminum oxide family is replaced by at least one other element.
- 7. The light emitting device according to claim 5, wherein the yttrium in the yttrium-aluminum oxide family of fluorescent materials includes at least one of the elements selected from the group consisting of Ba, Sr, Mg, Ca, and Zn, or the yttrium in the yttrium-aluminum oxide family of fluorescent materials includes Si.
- 8. The light emitting device according to claim 1, wherein at least the film thickness of the layer including the light scattering material formed over the upper surfaces of the side-walls of said package is 1-10 μm, and the particle diameter of the light scattering material therein is 10-20 μm.
- 9. The light emitting device according to claim 6, wherein the at least one element which replaces part or all of the yttrium in the yttrium-aluminum oxide family of fluorescent materials is selected from the group consisting of Lu, Sc, La, Gd, and Sm.
Priority Claims (3)
Number |
Date |
Country |
Kind |
2000-219932 |
Jul 2000 |
JP |
|
2001-202600 |
Jul 2001 |
JP |
|
2001-217915 |
Jul 2001 |
JP |
|
Parent Case Info
This application is a divisional application of U.S. Ser. No. 09/907,715, filed Jul. 19, 2001 now U.S. Pat. No. 6,657,382.
This application is based on applications No. 2000-219932 filed in Japan on Jul. 21, 2000, No. 2001-202600 filed in Japan on Jul. 3, 2001, and No. 2001-217915 filed in Japan on Jul. 18, 2001, the contents of which are incorporated hereinto by reference.
US Referenced Citations (10)