Light-emitting device

Patent metadata

Field	Value
Publication number	US-11832489-B2
Application number	US-202017060660-A
Country	US
Kind code	B2
Filing date	Oct 1, 2020
Priority date	Dec 4, 2019
Publication date	Nov 28, 2023
Grant date	Nov 28, 2023

Abstract

A light-emitting device includes: a plurality of first electrodes respectively disposed in a first subpixel, a second subpixel, and a third subpixel; a second electrode facing the plurality of first electrodes; a first emission layer disposed in the first subpixel to emit a first-color light; a second emission layer disposed in the second subpixel to emit a second-color light; a first layer disposed between the second electrode and each of the first emission layer and the second emission layer, and integrated with the first subpixel, the second subpixel, and the third subpixel; a hole transport region disposed between the plurality of first electrodes and each of the first layer, the first emission layer, and the second emission layer; a first auxiliary layer disposed between the hole transport region and the first emission layer; and a first intermediate layer disposed between the first auxiliary layer and the first emission layer.

First claim

What is claimed is:

1. A light-emitting device comprising:
a plurality of first electrodes respectively disposed in a first subpixel, a second subpixel, and a third subpixel;
a second electrode facing the plurality of first electrodes;
a first emission layer disposed in the first subpixel to emit a first-color light;
a second emission layer disposed in the second subpixel to emit a second-color light;
a first layer disposed between the second electrode and each of the first emission layer and the second emission layer, and integrated with the first subpixel, the second subpixel, and the third subpixel;
a hole transport region disposed between the plurality of first electrodes and each of the first layer, the first emission layer, and the second emission layer;
a first auxiliary layer disposed between the hole transport region and the first emission layer; and
a first intermediate layer disposed between the first auxiliary layer and the first emission layer; and
a second intermediate layer between the first intermediate layer and the first emission layer,
wherein other layers are not disposed between the first layer and the first emission layer;
the first auxiliary layer comprises a p-dopant,
an absolute value of a HOMO energy level of the first intermediate layer is greater than an absolute value of a HOMO energy level of the first auxiliary layer and smaller than an absolute value of a HOMO energy level of the first emission layer, and
an absolute value of a LUMO energy level of the first intermediate layer is greater than an absolute value of a LUMO energy level of the first auxiliary layer and smaller than an absolute value of a LUMO energy level of the first emission layer,
wherein an absolute value of a HOMO energy level of the second intermediate layer is greater than an absolute value of a HOMO energy level of the first intermediate layer and smaller than an absolute value of a HOMO energy level of the first emission layer, and
an absolute value of a LUMO energy level of the second intermediate layer is greater than an absolute value of a LUMO energy level of the first intermediate layer and smaller than an absolute value of a LUMO energy level of the first emission layer.

2. The light-emitting device of claim 1 , wherein the first layer does not directly contact the first emission layer.

3. The light-emitting device of claim 1 , wherein the first intermediate layer comprises a p-dopant or a single film comprising a p-dopant.

4. The light-emitting device of claim 1 , wherein at least one of the first intermediate layer and the first auxiliary layer further comprises a hole transport compound.

5. The light-emitting device of claim 4 , wherein the hole transport compound comprises at least one compound of Formula 201 and of Formula 202 below:

wherein, in Formulae 201 and 202,
L 201 to L 204 are each, independently from one another, a substituted or unsubstituted C 3 -C 10 cycloalkylene group, a substituted or unsubstituted C 1 -C 10 heterocycloalkylene group, a substituted or unsubstituted C 3 -C 10 cycloalkenylene group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenylene group, a substituted or unsubstituted C 6 -C 60 arylene group, a substituted or unsubstituted C 1 -C 60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic fused polycyclic group, or a substituted or unsubstituted divalent non-aromatic fused heteropolycyclic group;
L 205 is *—O—*′, —S—*′, *—N(Q 201 )-*′, a substituted or unsubstituted C 1 -C 20 alkylene group, a substituted or unsubstituted C 2 -C 20 alkenylene group, a substituted or unsubstituted C 3 -C 10 cycloalkylene group, a substituted or unsubstituted C 1 -C 10 heterocycloalkylene group, a substituted or unsubstituted C 3 -C 10 cycloalkenylene group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenylene group, a substituted or unsubstituted C 6 -C 60 arylene group, a substituted or unsubstituted C 1 -C 60 heteroarylene group, a substituted or unsubstituted divalent non-aromatic fused polycyclic group, or a substituted or unsubstituted divalent non-aromatic fused heteropolycyclic group;
xa1 to xa4 are each, independently from one another, an integer from 0 to 3;
xa5 is an integer from 1 to 10;
R 201 to R 204 and Q 201 are each, independently from one another, a substituted or unsubstituted C 3 -C 10 cycloalkyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkyl group, a substituted or unsubstituted C 3 -C 10 cycloalkenyl group, a substituted or unsubstituted C 1 -C 10 heterocycloalkenyl group, a substituted or unsubstituted C 6 -C 60 aryl group, a substituted or unsubstituted C 6 -C 60 aryloxy group, a substituted or unsubstituted C 6 -C 60 arylthio group, a substituted or unsubstituted C 1 -C 60 heteroaryl group, a substituted or unsubstituted monovalent non-aromatic fused polycyclic group, or a substituted or unsubstituted monovalent non-aromatic fused heteropolycyclic group; and
at least one substituent of the substituted C 3 -C 10 cycloalkylene group, the substituted C 1 -C 10 heterocycloalkylene group, the substituted C 3 -C 10 cycloalkenylene group, the substituted C 1 -C 10 heterocycloalkenylene group, the substituted C 6 -C 60 arylene group, the substituted C1-C 60 heteroarylene group, the substituted divalent non-aromatic fused polycyclic group, the substituted divalent non-aromatic fused heteropolycyclic group, the substituted C 1 -C 20 alkylene group, the substituted C 2 -C 20 alkenylene group, the substituted C 3 -C 10 cycloalkyl group, the substituted C 1 -C 10 heterocycloalkyl group, the substituted C 3 -C 10 cycloalkenyl group, the substituted C 1 -C 10 heterocycloalkenyl group, the substituted C 6 -C 60 aryl group, the substituted C 6 -C 60 aryloxy group, the substituted C 6 -C 60 arylthio group, the substituted C 1 -C 60 heteroaryl group, the substituted monovalent non-aromatic fused polycyclic group, and the substituted monovalent non-aromatic fused heteropolycyclic group is:
deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, and a hydrazono group;
a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, and a C 1 -C 60 alkoxy group, each optionally substituted, independently from one another, with at least one of deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic fused polycyclic group, a monovalent non-aromatic fused heteropolycyclic group, —Si(Q 11 )(Q 12 )(Q 13 ), —N(Q 11 )(Q 12 ), —B(Q 11 )(Q 12 ), —C(═O)(Q 11 ), —S(═O) 2 (Q 11 ), and —P(═O)(Q 11 )(Q 12 );
a C 3 -C 10 cycloalkyl group, a C 1 -C 10 heterocycloalkyl group, a C 3 -C 10 cycloalkenyl group, a C 1 -C 10 heterocycloalkenyl group, a C 6 -C 60 aryl group, a C 6 -C 60 aryloxy group, a C 6 -C 60 arylthio group, a C 1 -C 60 heteroaryl group, a monovalent non-aromatic fused polycyclic group, and a monovalent non-aromatic fused heteropolycyclic group, each optionally substituted, independently from one another, with at least one of deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an amidino group, a hydrazino group, a hydrazono group, a C 1 -C 60 alkyl group, a C 2 -C 60 alkenyl group, a C 2 -C 60 alkynyl group, a C 1 -C 60 alkoxy group, a C 3 -C

Assignees

• Samsung Display Co Ltd

Inventors

• Jeon Pyungeun
• Sohn Yoojin
• Lee Juwon
• Kim Wonjong

Classifications

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/876

  comprising a resonant cavity structure, e.g. Bragg reflector pair · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K50/115

  comprising active inorganic nanostructures, e.g. luminescent quantum dots · CPC title

• H10K50/11 Primary

  characterised by the electroluminescent [EL] layers · CPC title