Light-emitting device, display panel and display apparatus

Patent metadata

Field	Value
Publication number	US-2025098400-A1
Application number	US-202318576367-A
Country	US
Kind code	A1
Filing date	May 17, 2023
Priority date	May 17, 2023
Publication date	Mar 20, 2025
Grant date	—

Abstract

A light-emitting device is provided, and the light-emitting device includes a first electrode, a second electrode and at least two light-emitting units. The first electrode and the second electrode are arranged in a first direction in sequence. The at least two light-emitting units are disposed between the first electrode and the second electrode, and are arranged in a second direction, and the second direction intersects the first direction. Photons emitted by each light-emitting unit of the at least two light-emitting units include first luminescent photons and second luminescent photons. Emission time of the first luminescent photons is less than emission time of the second luminescent photons. The number of second luminescent photons emitted by at least one light-emitting unit is less than or equal to the number of first luminescent photons emitted by the at least one light-emitting unit.

First claim

1 . A light-emitting device, comprising:
a first electrode and a second electrode arranged in a first direction in sequence; and at least two light-emitting units provided between the first electrode and the second electrode, the at least two light-emitting units being arranged in a second direction, and the second direction intersecting the first direction; wherein photons emitted by each light-emitting unit of the at least two light-emitting units include first luminescent photons and second luminescent photons, and emission time of the first luminescent photons is less than emission time of the second luminescent photons; wherein the number of second luminescent photons emitted by at least one light-emitting unit is less than or equal to the number of first luminescent photons emitted by the at least one light-emitting unit.

2 . The light-emitting device according to claim 1 , wherein the at least two light-emitting units include at least three light-emitting units, and the at least three light-emitting units are arranged in the second direction;
under a normalization condition, for any two light-emitting units, a difference of a ratio of the number of first luminescent photons to the number of photons emitted by a light-emitting unit is less than or equal to 40%.

3 . The light-emitting device according to claim 1 =, wherein each light-emitting unit of the at least two light-emitting units includes at least one light-emitting layer;
each light-emitting layer of the at least one light-emitting layer includes a first host material and a luminescent material, and the at least one light-emitting layer further includes a second host material; wherein triplet energy level of the second host material is less than or equal to triplet energy level of the first host material, and the triplet energy level of the second host material is greater than or equal to triplet energy level of the luminescent material.

4 . The light-emitting device according to claim 3 , wherein a difference between the triplet energy level of the first host material and the triplet energy level of the second host material is greater than or equal to 0.1 eV, and a difference between the triplet energy level of the second host material and the triplet energy level of the luminescent material is greater than or equal to 0.1 eV.

5 . The light-emitting device according to claim 3 , wherein a difference between a peak wavelength of an emission spectrum of the second host material and a peak wavelength of an absorption spectrum of the luminescent material is less than or equal to 40 nm.

6 . The light-emitting device according to claim 3 , wherein a difference between a peak wavelength of an emission spectrum of the second host material and a peak wavelength of an absorption spectrum of the luminescent material is less than or equal to 30 nm.

7 . The light-emitting device according to claim 3 , wherein singlet energy level of the first host material is greater than or equal to singlet energy level of the second host material, and the singlet energy level of the second host material is greater than or equal to singlet energy level of the luminescent material.

8 . The light-emitting device according to claim 3 , wherein
an absolute value of a difference between a highest occupied molecular orbital energy level of the second host material and a highest occupied molecular orbital energy level of the first host material is less than or equal to 0.3 eV; an absolute value of a difference between a lowest occupied molecular orbital energy level of the second host material and a lowest occupied molecular orbital energy level of the luminescent material is less than or equal to 0.2 eV; an absolute value of the lowest occupied molecular orbital energy level of the second host material is greater than or equal to an absolute value of a lowest occupied molecular orbital energy level of the first host material; and an absolute value of a lowest occupied molecular orbital energy level of the luminescent material is greater than or equal to the absolute value of the lowest occupied molecular orbital energy level of the first host material.

9 . The light-emitting device according to claim 3 , wherein in each light-emitting layer, the difference between the triplet energy level of the first host material and the triplet energy level of the luminescent material is greater than or equal to 0.15 eV.

10 . The light-emitting device according to claim 3 , wherein the second host material includes any one of ligand groups IA represented by a general formula I;

F is selected from a five-membered or six-membered carbocyclic ring or carboheterocyclic ring; a value of m is selected from any one of 0, 1, 2, 3 and 4;
Z 1 , Z 2 and Z 3 are the same or different, and are each independently selected from carbon and nitrogen;
the ligand group IA is bonded to M, and M is selected from any one of ruthenium, osmium, iridium, palladium, copper, silver and gold; the second host material includes n-dentate ligand material formed by the structure shown by the general formula I and M, and a value of n is selected from any one of 3, 4, 5 and 6; and
Ra, Rb and Rc are the same or different, and are independently selected from any one of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silicyl, germyl, boryl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfenyl, sulfinyl, sulfonyl, and phosphine.

11 . The light-emitting device according to claim 3 , wherein the second host material is selected from any one of structures represented by the following general formula II;

F is selected from a five-membered or six-membered carbocyclic ring or carboheterocyclic ring; a value of m is selected from any one of 0, 1, 2, 3 and 4;
J and E are the same or different, and are independently selected from a five-membered or six-membered carbocyclic ring or carboheterocyclic ring;
Z 1 , Z 2 and Z 3 are the same or different, and are each independently selected from carbon and nitrogen;
M is selected from one of platinum and palladium;
L 1 and L 2 are the same or different, and are independently selected from any of B(Rf), N(Rf), P(Rf), O, S, Se, C═O, S═O, SO 2 , C(Rf Rg), Si(Rf Rg) and Ge(Rf Rg); and
Ra, Rb, Rc, Re, Rd, Rf, and Rg are the same or different, and are independently selected from any one of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, aralkyl, alkoxy, aryloxy, amino, silicyl, germyl, boryl, selenyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfenyl, sulfinyl, sulfonyl, and phosphine.

12 . The light-emitting device according to claim 11 , wherein J and E are not both the five-membered carbocyclic ring or carboheterocyclic ring; and/or
L 1 and L 2 are different.

13 . (canceled)

14 . The light-emitting device according to claim 10 , wherein at least one of Ra, Rb and Rc contains deuterium.

15 . The light-emitting device according to claim 10 , wherein a mass proportion of the second host material in the light-emitting layer is greater than or equal to 10% and less than or equal to 50%.

16 . The light-emit

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sun Haiyan
• Zhang Xiaojin
• Wang Dan

Classifications

• H10K50/11

  characterised by the electroluminescent [EL] layers · CPC title

• H10K2101/10

  Triplet emission · CPC title

• H10K85/346

  comprising platinum · CPC title

• H10K50/12

  comprising dopants · CPC title

• H10K2101/90

  Multiple hosts in the emissive layer · CPC title