WAVE-LENGTH CONVERSION INORGANIC MEMBER, AND METHOD FOR MANUFACTURING THE SAME

• US 20130257264A1
• Filed: 03/28/2013
• Published: 10/03/2013
• Est. Priority Date: 03/28/2012
• Status: Active Grant

• Current Assignee: Nichia Corporation
• Original Assignee: Nichia Corporation
• Inventors: TAMAKI, Hiroto, WAKAKI, Takayoshi, HAYASHI, Tadao, SATO, Yoshiki, OYAMATSU, Daisuke, SUGIYAMA, Takafumi, KOSUGI, Takao
• Granted Patent: US 8,994,259 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: B05D 5/06 to obtain multicolour or other optical effects B05D5/02 takes precedence
• CPC Class Codes: C23C 16/45525 Atomic layer deposition [ALD]
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 7/00 Reflectors for light sources characterised by cooling arrangements F21V29/505
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: F21Y 2115/30 Semiconductor lasers
• CPC Class Codes: H01L 2224/32225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 31/055 where light is absorbed and re-emitted at a different wavelength by the optical element directly associated or integrated with the PV cell, e.g. by using luminescent material, fluorescent concentrators or up-conversion arrangements
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil
• CPC Class Codes: H05B 33/12 Light sources with substantially two-dimensional radiating surfaces
• CPC Class Codes: Y02E 10/52 PV systems with concentrators
• CPC Class Codes: Y10T 428/24364 with transparent or protective coating
• CPC Class Codes: Y10T 428/24372 : Particulate matter
• CPC Class Codes: Y10T 428/24413 : Metal or metal compound
• CPC Class Codes: Y10T 428/24421 : Silicon containing

Abstract

A wave-length conversion inorganic member can includes a base body and an inorganic particle layer on the base body. The inorganic particle layer can include particles of an inorganic wave-length conversion substance which is configured to absorb light of a first wave-length and to emit light of a second wave-length different from the first wave-length. The inorganic particle layer can include an agglomerate of a plurality of the particles. Each of the plurality of the particles are in contact with at least one of the other particles or the base body. A cover layer comprises an inorganic material, and the cover layer continuously covers a surface of the base body and surfaces of the particles. The inorganic particle layer has an interstice enclosed by the particles, or by the particles and one of the base body and the cover layer.

Claims

1. A wave-length conversion inorganic member comprising:

a base body; and

an inorganic particle layer on the base body, the inorganic particle layer including particles of an inorganic wave-length conversion substance which is configured to absorb light of a first wave-length and to emit light of a second wave-length different from the first wave-length,

the inorganic particle layer comprising

an agglomerate of a plurality of the particles, wherein each of the plurality of the particles are in contact with at least one of the other particles or the base body; and

a cover layer comprising an inorganic material, and the cover layer continuously covering a surface of the base body and surfaces of the particles,

the inorganic particle layer having an interstice enclosed by the particles, or by the particles and one of the base body and the cover layer.

2. The wave-length conversion inorganic member according to claim 1,

wherein the base body comprises a translucent material.

3. The wave-length conversion inorganic member according to claim 1,

wherein the base body and the inorganic particle layer has a boundary surface therebetween, and

wherein the boundary surface is configured to reflect the light of the first wave-length and the light of the second wave-length.

4. The wave-length conversion inorganic member according to claim 1,

wherein the base body comprises an inorganic wave-length conversion substance which absorbs the light of the first wave-length and emits light of a third wave-length different from the first wave-length and the second wave-length.

5. The wave-length conversion inorganic member according to claim 1, wherein the base body comprises a light source which is configured to emit light of the first wavelength.

6. The wave-length conversion inorganic member according to claim 1,

wherein the inorganic particle layer has a plurality of interstices, and has a density of 1% to 50%.

7. The wave-length conversion inorganic member according to claim 1,

wherein the particles of the wave-length conversion substance have an average particle size of 0.1 μ

m to 100 μ

m, and

wherein the cover layer has an average thickness of 10 nm to 50 μ

m.

8. The wave-length conversion inorganic member according to claim 1,

wherein the inorganic particle layer has a concave and convex surface formed by variations in particle sizes of the particles of the wave-length conversion substance.

9. The wave-length conversion inorganic member according to claim 1,

wherein the cover layer is formed by atomic layer deposition.

10. The wave-length conversion inorganic member according to claim 1,

wherein the cover layer contains at least one compound selected from the group consisting of Al₂O₃, SiO₂, ZrO₂, HfO₂, TiO₂, ZnO, Ta₂O₅, Nb₂O₅, In₂O₃, SnO₂, TiN, and AlN.

11. The wave-length conversion inorganic member according to claim 1,

wherein the wave-length conversion substance contains at least one compound selected from the group consisting of sulfide phosphor, halogen-silicate phosphor, nitride phosphor, and oxynitride phosphor.

12. A wave-length conversion inorganic member according to claim 1,

wherein each of the plurality of the particles of the wave-length conversion substance is bonded to at least one of the other particles or the base body by an inorganic binder.

13. A method for manufacturing a wave-length conversion inorganic member, said method comprising:

an inorganic particle layer forming process for forming an agglomerate including a plurality of particles of an inorganic wave-length conversion substance which absorbs light of a first wave-length, and emits light of a second wave-length different from the first wave-length; and

a cover-layer forming process for forming a cover layer comprising an inorganic material which continuously covers a surface of the substrate and surfaces of particles.

14. The method according to claim 13,

wherein the cover layer forming process comprises forming the cover layer by atomic layer deposition.