Color correction filter for white organic electroluminescent light source, and organic electroluminescent display device

Patent metadata

Field	Value
Publication number	US-11950480-B2
Application number	US-202017025079-A
Country	US
Kind code	B2
Filing date	Sep 18, 2020
Priority date	Mar 29, 2018
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

There are provided a color correction filter for a white organic electroluminescent light source including a resin and 0.1 part by mass or more of a coloring agent having an absorption maximum wavelength in a range of 560 to 620 nm or 460 to 520 nm with respect to 100 parts by mass of the resin, and having a moisture content of 0.5% by mass or less, and an organic EL display device having this filter.

First claim

What is claimed is:

1. A color correction filter for a white organic electroluminescent light source, the color correction filter comprising:
a resin; and
0.1 parts by mass or more of a squarine-based coloring agent represented by Formula (1) and having an absorption maximum wavelength in a range of 560 to 620 nm or 460 to 520 nm with respect to 100 parts by mass of the resin,
wherein the coloring agent is in a form of a coloring agent containing a polarization degree improver having a coloring agent portion and a polarization degree improver portion;
wherein the polarization degree improver portion is selected from an electron donating type quencher portion or an electron accepting type quencher portion;
wherein an energy level of a HOMO of the coloring agent portion and an energy level of a HOMO of the electron donating type quencher portion satisfy Relational Expression [A-1] below,
E Hq −E Hd ≤0.40 eV,  Relational Expression [A-1]:

where E Hd and E Hq respectively represent the following values,
E Hd : energy level of HOMO of coloring agent portion, and
E Hq : energy level of HOMO of electron donating type quencher portion;
wherein an energy level of a LUMO of the coloring agent portion and an energy level of a LUMO of the electron accepting type quencher portion satisfy Relational Expression [B-1] below,
E Ld −E Lq ≤0 eV,  Relational Expression [B-1]:

where E Ld and E Lq respectively represent the following values,
E Ld : energy level of LUMO of coloring agent portion, and
E Lq : energy level of LUMO of electron accepting type quencher portion; and
wherein the filter has a moisture content of 0.5% by mass or less,

in Formula (1), A and B each independently represent an aryl group which may have a substituent, a heterocyclic group which may have a substituent, or —CH=G, and G represents a heterocyclic group which may have a substituent.

2. The color correction filter for a white organic electroluminescent light source according to claim 1 ,
wherein the resin satisfies Relational Expression [C] below,
0.80 ≤fd≤ 0.95  Relational Expression [C]:

where the fd value is defined by Relational Expression I below,
fd=δd /(δ d+δp+δh ),  Relational Expression I:

in Relational Expression I, δd, δp, and δh respectively indicate a term corresponding to a London dispersion force, a term corresponding to a dipole-dipole force, and a term corresponding to a hydrogen bonding force with respect to a solubility parameter δt calculated by a Hoy method.

3. The color correction filter for a white organic electroluminescent light source according to claim 1 ,
wherein the resin contains a polystyrene resin.

4. The color correction filter for a white organic electroluminescent light source according to claim 1 ,
wherein the resin contains a cyclic polyolefin resin.

5. An organic electroluminescent display device comprising:
the color correction filter for a white organic electroluminescent light source according to claim 1 .

Assignees

• Fujifilm Corp

Inventors

• Naito Yu
• Fukagawa Nobutaka
• Sasaki Daisuke
• Kuwahara Hiroki

Classifications

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title

• G02B5/22

  Absorbing filters {(G02B5/201 - G02B5/208 take precedence)} · CPC title

• H05B33/20 Primary

  characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded · CPC title

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title

• H10K2101/40

  Interrelation of parameters between multiple constituent active layers or sublayers, e.g. HOMO values in adjacent layers · CPC title