WAVELENGTH CONVERSION MEMBER AND LIGHT-EMITTING DEVICE

• US 20180195690A1
• Filed: 12/07/2017
• Published: 07/12/2018
• Est. Priority Date: 01/11/2017
• Status: Abandoned Application

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ryohwa, Tatsuya, Yamazumi, Noriyuki, Yoshimura, Kenichi, Fukunaga, Hiroshi, Nakata, Kanako, Izumi, Makoto
• Application Number:
  US15/834,215
• Publication Number:
  US 20180195690A1
• Time in Patent Office: Days
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/646 Silicates
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: F21V 9/30 Elements containing photoluminescent material distinct from or spaced from the light source shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40
• CPC Class Codes: H01L 33/501 characterised by the materials, e.g. binder
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

A wavelength conversion member includes a light-transmitting medium and phosphor-containing particles dispersed in the light-transmitting medium and including a resin and a semiconductor nanoparticle phosphor dispersed in the resin, wherein the phosphor-containing particles have a particle size that is equal to or larger than a particle size of the semiconductor nanoparticle phosphor and that is equal to or smaller than a minimum thickness of the wavelength conversion member. A light-emitting device includes a light source and a wavelength converter including a light-transmitting medium and phosphor-containing particles including a resin including a constitutional unit derived from an ionic liquid having a polymerizable functional group and a semiconductor nanoparticle phosphor dispersed in the resin, wherein the phosphor-containing particles have a particle size that is equal to or larger than a particle size of the semiconductor nanoparticle phosphor and that is equal to or smaller than a minimum thickness of the wavelength converter.

Claims

1. A wavelength conversion member comprising:

a light-transmitting medium; and

phosphor-containing particles dispersed in the light-transmitting medium and including

a resin including a constitutional unit derived from an ionic liquid having a polymerizable functional group and

a semiconductor nanoparticle phosphor dispersed in the resin,

wherein the phosphor-containing particles have a particle size that is equal to or larger than a particle size of the semiconductor nanoparticle phosphor and that is equal to or smaller than a minimum thickness of the wavelength conversion member.

2. A light-emitting device comprising:

the wavelength conversion member according to claim 1; and

a light source configured to emit excitation light to the wavelength conversion member, and disposed as another member in addition to the wavelength conversion member.

3. The light-emitting device according to claim 2, wherein the particle size of the phosphor-containing particles is equal to or larger than twice the particle size of the semiconductor nanoparticle phosphor, and is equal to or smaller than ½

of the minimum thickness of the wavelength conversion member.

4. The light-emitting device according to claim 2, wherein the particle size of the phosphor-containing particles is in a range of 1 to 30 μ

m.

5. The light-emitting device according to claim 2, wherein the phosphor-containing particles have an outermost surface including a light-transmitting cover layer.

6. The light-emitting device according to claim 5, wherein the cover layer is formed of an inorganic material having a band gap of 3.0 eV or more.

7. The light-emitting device according to claim 2, wherein the polymerizable functional group is a (meth)acrylate group.

8. The light-emitting device according to claim 2, wherein the semiconductor nanoparticle phosphor includes a semiconductor nanoparticle phosphor configured to emit red fluorescence and a semiconductor nanoparticle phosphor configured to emit green fluorescence.

9. The light-emitting device according to claim 2, wherein, in the medium, a phosphor other than the semiconductor nanoparticle phosphor is further dispersed.

10. A light-emitting device comprising:

a light source; and

a wavelength converter joined to the light source so as to cover at least a portion of the light source and including

a light-transmitting medium, and

phosphor-containing particles dispersed in the light-transmitting medium and including

a resin including a constitutional unit derived from an ionic liquid having a polymerizable functional group, and

a semiconductor nanoparticle phosphor dispersed in the resin,

wherein the phosphor-containing particles have a particle size that is equal to or larger than a particle size of the semiconductor nanoparticle phosphor and that is equal to or smaller than a minimum thickness of the wavelength converter.

11. The light-emitting device according to claim 10, wherein the particle size of the phosphor-containing particles is equal to or larger than twice the particle size of the semiconductor nanoparticle phosphor, and is equal to or smaller than ½

of the minimum thickness of the wavelength converter.

12. The light-emitting device according to claim 10, wherein the particle size of the phosphor-containing particles is in a range of 1 to 30 μ

m.

13. The light-emitting device according to claim 10, wherein the phosphor-containing particles have an outermost surface including a light-transmitting cover layer.

14. The light-emitting device according to claim 13, wherein the cover layer is formed of an inorganic material having a band gap of 3.0 eV or more.

15. The light-emitting device according to claim 10, wherein the polymerizable functional group is a (meth)acrylate group.

16. The light-emitting device according to claim 10, wherein the semiconductor nanoparticle phosphor includes a semiconductor nanoparticle phosphor configured to emit red fluorescence and a semiconductor nanoparticle phosphor configured to emit green fluorescence.

17. The light-emitting device according to claim 10, wherein, in the medium, a phosphor other than the semiconductor nanoparticle phosphor is further dispersed.