Wavelength conversion member and light-emitting device

Patent metadata

Field	Value
Publication number	US-9657221-B2
Application number	US-201314655533-A
Country	US
Kind code	B2
Filing date	Dec 26, 2013
Priority date	Dec 28, 2012
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

Disclosed is a wavelength conversion member which is a resin-molded article having dispersed therein a complex fluoride fluorophore that absorbs light with a blue wavelength component and emits light including a red wavelength component and that is represented by A 2 (M 1−x Mn x )F 6 (in the formula: M is at least one type of tetravalent element selected from Si, Ti, Zr, Hf, Ge, and Sn; A is at least one type of alkali metal selected from Li, Na, K, Rb, and Cs and including at least Na and/or K; and x is from 0.001 to 0.3), wherein the hue of the wavelength conversion member when light is not emitted is as follows in CIELAB (CIE 1976): L*=from 40 to 60 inclusive; a*=from 0 to +1 inclusive; and b*=from +2 to +15 inclusive.

First claim

The invention claimed is:

1. A wavelength conversion member which is a molded resin having dispersed therein a phosphor capable of absorbing light of a blue wavelength component and emitting light containing a red wavelength component wherein the wavelength conversion member in the non-emissive state has a color expressed as L*=40 to 60, a*=0 to +1, and b*=+2 to +15 according to CIELAB (CIE 1976).

2. The wavelength conversion member of claim 1 wherein said phosphor is a complex fluoride phosphor having the formula (1):
A 2 (M 1−x Mn x )F 6   (1)

wherein M is one or two or more of tetravalent elements selected from Si, Ti, Zr, Hf, Ge, and Sn, A is one or two or more of alkali metals selected from Li, Na, K, Rb, and Cs and containing at least Na and/or K, and x is a number of 0.001 to 0.3.

3. The wavelength conversion member of claim 2 wherein the complex fluoride phosphor is manganese-activated potassium silicofluoride of the formula: K 2 (Si 1−x Mn x )F 6 wherein M and x are as defined above.

4. The wavelength conversion member of claim 1 wherein the phosphor is present in an amount of 2 to 30% by weight.

5. The wavelength conversion member of claim 1 , having an average thickness of 0.05 to 5 mm.

6. The wavelength conversion member of claim 1 wherein said resin is a thermoplastic resin.

7. The wavelength conversion member of claim 1 which is a lamp cover or lamp shade.

8. A light-emitting device comprising
a light-emitting element including an LED light source capable of emitting at least blue light, and adapted to emit pseudo-white light containing a blue wavelength component, and
the wavelength conversion member of claim 1 , disposed outside the light-emitting element.

9. The light-emitting device of claim 8 , further comprising a transparent protective cover covering the wavelength conversion member.

10. The wavelength conversion member of claim 2 wherein the phosphor is present in an amount of 2 to 30% by weight.

11. The wavelength conversion member of claim 3 wherein the phosphor is present in an amount of 2 to 30% by weight.

12. The wavelength conversion member of claim 2 , having an average thickness of 0.05 to 5 mm.

13. The wavelength conversion member of claim 3 , having an average thickness of 0.05 to 5 mm.

14. The wavelength conversion member of claim 4 , having an average thickness of 0.05 to 5 mm.

15. The wavelength conversion member of claim 2 wherein said resin is a thermoplastic resin.

16. The wavelength conversion member of claim 3 wherein said resin is a thermoplastic resin.

17. The wavelength conversion member of claim 4 wherein said resin is a thermoplastic resin.

18. The wavelength conversion member of claim 5 wherein said resin is a thermoplastic resin.

19. The wavelength conversion member of claim 2 which is a lamp cover or lamp shade.

20. The wavelength conversion member of claim 3 which is a lamp cover or lamp shade.

Assignees

• Shinetsu Chemical Co

Inventors

• Tsumori Toshihiro
• Minowa Takehisa
• Kaneyoshi Masami
• Wataya Kazuhiro

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21V3/04

  characterised by materials, surface treatments or coatings · CPC title

• C09K11/02

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title

• C09K11/617 Primary

  Silicates · CPC title

• F21K9/64 Primary

  using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer · CPC title