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

Abstract

A phosphor containing particle includes a semiconductor nanoparticle phosphor and a matrix including a constitutional unit derived from an ionic liquid, the semiconductor nanoparticle phosphor being dispersed in the matrix. A light emitting device comprises a light source and a wavelength converter in which the phosphor containing particle of the present invention is dispersed in a translucent medium. A phosphor containing sheet in which the phosphor containing particle of the present invention is dispersed in a sheet-like translucent medium.

What is claimed is: 
     
         1 . A phosphor containing particle comprising:
 a semiconductor nanoparticle phosphor; and   a matrix including a constitutional unit derived from an ionic liquid,   the semiconductor nanoparticle phosphor being dispersed in the matrix.   
     
     
         2 . The phosphor containing particle according to  claim 1 , wherein the matrix includes a resin derived from the ionic liquid. 
     
     
         3 . The phosphor containing particle according to  claim 2 , wherein the ionic liquid has a polymerizable functional group. 
     
     
         4 . The phosphor containing particle according to  claim 1 , having a particle size within a range of about 100 nm to about 30 μm. 
     
     
         5 . The phosphor containing particle according to  claim 1 , wherein the semiconductor nanoparticle phosphor is of a single type. 
     
     
         6 . The phosphor containing particle according to  claim 1 , comprising a red fluorescent light emitting semiconductor nanoparticle phosphor and a green fluorescent light emitting semiconductor nanoparticle phosphor. 
     
     
         7 . The phosphor containing particle according to  claim 2 , wherein the resin is crosslinked. 
     
     
         8 . The phosphor containing particle according to  claim 1 , having an outermost surface including a translucent coating layer. 
     
     
         9 . The phosphor containing particle according to  claim 8 , wherein a material included in the coating layer is an inorganic material having a band gap equal to or greater than 3.0 eV. 
     
     
         10 . The phosphor containing particle according to  claim 1 , comprising a support which seals the matrix. 
     
     
         11 . The phosphor containing particle according to  claim 10 , wherein the support includes silica. 
     
     
         12 . The phosphor containing particle according to  claim 10 , wherein the semiconductor nanoparticle phosphor has a surface including a polar functional group. 
     
     
         13 . The phosphor containing particle according to  claim 10 , wherein the support has a hollow capsular structure having pores penetrating from a wall surface into an internal space. 
     
     
         14 . The phosphor containing particle according to  claim 10 , wherein the support has a globular structure having pores extending from a surface inwards. 
     
     
         15 . A light emitting device comprising a light source and a wavelength converter in which the phosphor containing particle according to  claim 1  is dispersed in a translucent medium. 
     
     
         16 . The light emitting device according to  claim 15 , comprising a phosphor containing particle in which a red fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group, and a phosphor containing particle in which a green fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group. 
     
     
         17 . The light emitting device according to  claim 15 , wherein a phosphor other than the semiconductor nanoparticle phosphor is further dispersed in the medium. 
     
     
         18 . A phosphor containing sheet in which the phosphor containing particle according to  claim 1  is dispersed in a sheet-like translucent medium. 
     
     
         19 . The phosphor containing sheet according to  claim 18 , comprising a phosphor containing particle in which a red fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group, and a phosphor containing particle in which a green fluorescent light emitting semiconductor nanoparticle phosphor is dispersed in a resin including a constitutional unit derived from an ionic liquid including a polymerizable functional group. 
     
     
         20 . The phosphor containing sheet according to  claim 18 , wherein a phosphor other than the semiconductor nanoparticle phosphor is further dispersed in the medium.