Phosphor containing particle, and light emitting device and phosphor containing sheet using the same
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.
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 μm or less.
11. The phosphor containing particle according to claim 1 , wherein the shell portion has a thickness of about 0.1 μm or more and about 5 μm 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.