DISPLAY DEVICE

• US 20130141916A1
• Filed: 03/11/2011
• Published: 06/06/2013
• Est. Priority Date: 03/11/2010
• Status: Abandoned Application

• Current Assignee: National University Corporation Chiba University
• Original Assignee: National University Corporation Chiba University
• Inventors: Kobayashi, Norihisa, Nakamura, Kazuki, Watanabe, Yuichi
• Application Number:
  US13/583,919
• Publication Number:
  US 20130141916A1
• Time in Patent Office: Days
• US Class Current: 362/260
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/182 of the rare earth metals, i.e. Sc, Y or lanthanide
• CPC Class Codes: F21V 9/00 Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters coloured shades F21V1/00; elements characterised by cooling arrangements F21V29/502
• CPC Class Codes: G02F 1/1503 caused by oxidation-reduction reactions in organic liquid solutions, e.g. viologen solutions
• CPC Class Codes: G02F 1/157 Structural association of cells with optical devices, e.g. reflectors or illuminating devices
• CPC Class Codes: G02F 2202/046 fluorescent
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: G09F 9/3023 Segmented electronic displays
• CPC Class Codes: G09F 9/372 the positions of the elements being controlled by the application of an electric field

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.

Claims

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).