Display device

Abstract

Disclosed is a high quality display device which avoids complicated element structure, and does not unnecessarily reduce portability. The display device comprises: a pair of substrates which are disposed facing each other, and on each of which electrodes are formed; and a material layer which is sandwiched between the pair of substrates. The material layer contains: a coloring material which changes color upon the application of a voltage; and a light-emitting material which emits light upon photoexcitation.

1 . A display device, comprising:
 a pair of substrates which are disposed facing each other, and on each of which electrodes are formed; and   a material layer which is sandwiched between the pair of substrates,   wherein the material layer contains a coloring material which changes color upon the application of a voltage, and a light-emitting material which emits light upon photoexcitation.   
     
     
         2 . The display device according to the  claim 1 , further comprising a light source for photoexcitation which allows the light-emitting material to emit light. 
     
     
         3 . The display device according to the  claim 1 ,
 wherein at least any of the coloring material and the light-emitting material is dispersed to the concentration of 5 mM or more and 300 mM or less in the material layer.   
     
     
         4 . The display device according to the  claim 1 ,
 Wherein the coloring material and the light-emitting material are alternately laminated with respective thicknesses of 10 nm or less.   
     
     
         5 . The light-emitting material according to  claim 1 ,
 wherein the coloring material and the light-emitting material are chemically combined.   
     
     
         6 . The display device according to the  claim 1 ,
 wherein the coloring material contains at least any of an organic electrochromic material and an inorganic electrochromic material, and the light-emitting material contains a rare earth complex.   
     
     
         7 . The display device according to the  claim 1 ,
 wherein the energy difference between ground state and excited state of the coloring material is less than or equal to that of the light-emitting material.   
     
     
         8 . The display device according to the  claim 1 ,
 wherein the coloring material includes at least any of 1,4-diacetyl benzene, N,N′-dimethyl viologen, poly(3,4-ethylenedioxythiophene), polyaniline, 1,4-diheptyl viologen, 4,4′-biphenyl dicarboxylic acid diethyl ester, and dimethyl terephthalate.   
     
     
         9 . The display device according to the  claim 1 ,
 wherein the light-emitting material includes at least any of tris(hexafluoroacetylacetonate) europium(III), tris(hexafluoroacetylacetonate) terbium(III), and tris(hexafluoroacetylacetonate) ytterbium(III).   
     
     
         10 . The light-emitting material according to the  claim 5 ,
 the chemical combination of the coloring material and the light-emitting material includes at least any of tris(hexafluoroacetylacetonate) europium (triphenylphosphin oxide)/polyaniline, tris(hexafluoroacetylacetonate) terbium (triphenylphosphin oxide)/polyaniline, tris(hexafluoroacetylacetonate) ytterbium (triphenylphosphin oxide)/polyaniline, tris(hexafluoroacetylacetonate) europium (1,4-diacetyl benzene), tris(hexafluoroacetylacetonate) terbium (1,4-diacetyl benzene), and tris(hexafluoroacetylacetonate) ytterbium (1,4-diacetyl benzene).