Phosphor containing particle, and light emitting device and phosphor containing sheet using the same

• US 10,483,441 B2
• Filed: 05/17/2018
• Issued: 11/19/2019
• Est. Priority Date: 06/09/2017
• Status: Active Grant

• 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, Nakata, Kanako, Fukunaga, Hiroshi, Izumi, Makoto
• Primary Examiner(s): Le, Dung A.
• Application Number:
  US15/981,941
• Publication Number:
  US 20180358517A1
• Time in Patent Office: 551 Days
• CPC Class Codes: C09K 11/08 containing inorganic luminescent materials
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/505 characterised by the shape, e.g. plate or foil

Abstract

A phosphor containing particle including a core portion which is a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a shell portion which is a matter in a form of a layer of resin which includes a constitutional unit derived from an ionic liquid and coats at least a portion of the core portion, and a phosphor containing particle including a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein and a metal oxide layer coating at least a portion of the particulate matter of resin. A light emitting device including a light source and a wavelength converter in which phosphor containing particles are dispersed in a translucent medium, and a phosphor containing sheet in which phosphor containing particles are dispersed in a sheet-shaped translucent medium.

Claims

1. A phosphor containing particle comprising:

a core portion which is a particulate matter of resin including a constitutional unit derived from an ionic liquid with a semiconductor nanoparticle phosphor dispersed therein; and

a shell portion which is a matter in a form of a layer of resin which includes a constitutional unit derived from an ionic liquid and coats at least a portion of the core portion, wherein

the ionic liquids included in the core portion and the shell portion are selected from a group consisting of 2-(methacryloyloxy)-ethyltrimethyl ammonium bis(trifluoromethane sulfonyl) imide, 1-(3-acryloyloxy-propyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, N,N,N-trimethyl-N-propylammonium bis(trifluoromethanesulfonyl) imide, and N,N-dimethyl-N-methyl-2-(2-methoxy ethyl) ammonium bis(trifluoromethanesulfonyl) imide.

2. The phosphor containing particle according to claim 1, wherein the shell portion does not include the semiconductor nanoparticle phosphor.

3. The phosphor containing particle according to claim 1, wherein the shell portion covers an entire surface of the core portion.

4. The phosphor containing particle according to claim 1, wherein the resin in the core portion and the resin in the shell portion are identical in type.

5. The phosphor containing particle according to claim 1, wherein the resin in the core portion and the resin in the shell portion are different in type.

6. The phosphor containing particle according to claim 1, wherein at least one of the resin in the core portion and the resin in the shell portion is a resin including a constitutional unit derived from an ionic liquid having a polymerizable functional group.

7. The phosphor containing particle according to claim 6, wherein the resin in the core portion and the resin in the shell portion are both a resin including a constitutional unit derived from an ionic liquid having a (meth)acrylic acid ester group as the polymerizable functional group.

8. The phosphor containing particle according to claim 6, wherein the resin in the shell portion contains a cross-linking agent at a mixing ratio larger than that of the cross-linking agent contained by the resin in the core portion.

9. The phosphor containing particle according to claim 8, wherein the cross-linking agent contained by the resin in the shell portion has a weight ratio of more than 50% with respect to the entire resin, and the cross-linking agent contained by the resin in the core portion has a weight ratio of 50% or less with respect to the entire resin.

10. The phosphor containing particle according to claim 1, having a particle size of about 100 nm or more and about 30 μ

m or less.

11. The phosphor containing particle according to claim 1, wherein the shell portion has a thickness of about 0.1 μ

m or more and about 5 μ

m or less.

12. A light emitting device comprising a light source and a wavelength converter in which phosphor containing particles according to claim 1 are dispersed in a translucent medium.

13. The light emitting device according to claim 12, including a phosphor containing particle in which in the core portion a red fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid and a phosphor containing particle in which in the core portion a green fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid.

14. A phosphor containing sheet in which phosphor containing particles according to claim 1 are dispersed in a sheet-shaped translucent medium.