Organic light-emitting device, display device

Patent metadata

Field	Value
Publication number	US-12527153-B2
Application number	US-202218268610-A
Country	US
Kind code	B2
Filing date	Apr 21, 2022
Priority date	Apr 21, 2022
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The disclosure provides an organic light-emitting device and a display device, which belong to the field of display technology. The organic light-emitting device includes a light-emitting layer ( 600 ), including a first host material, a second host material, at least one auxiliary material, and at least one dopant material; the first host material and the second host material form a first composite transport material; the auxiliary material and the second host material form the second composite transport material; S1(A)>S1(CH)>S1(C); T1(A)>T1(CH)>T1(C); S1(A) is the lowest singlet state energy of the host material, S1(CH) is the lowest singlet state energy of the composite transport material, S1(C) is the lowest singlet state energy of the dopant material; T1(A) is the lowest triplet state energy of the host material, T1(CH) is the lowest triplet state energy of the composite transport material, and T1(C) is the lowest triplet state energy of the dopant material.

First claim

What is claimed is:

1 . An organic light-emitting device, comprising a light-emitting layer, the light-emitting layer comprising a first host material, a second host material, at least one auxiliary material, and at least one dopant material;
wherein the first host material and the second host material form a first composite transport material; and the secondary material and the second host material form a second composite transport material; wherein the first host material, the second host material, the first composite transport material, the second composite transport material, and the dopant material satisfy, S1(A)>S1(CH)>S1(C); T1(A)>T1(CH)>T1(C); wherein S1(A) is a lowest singlet state energy of the first host material or the second host material, and S1(CH) is a lowest singlet state energy of the first composite transport material or the second composite transport material, and S1(C) is a lowest singlet state energy of the dopant material; and wherein T1(A) is a lowest triplet state energy of the first host material or the second host material, T1(CH) is a lowest triplet state energy of the first composite transport material or the second composite transport material, and T1(C) is a lowest triplet state energy of the dopant material.

2 . The organic light-emitting device according to claim 1 , wherein the first host material, the second host material, the first composite transport material, the second composite transport material and the auxiliary material satisfy,
S1(A)>S1(CH1)>S1(CH2), S1(A)>S1(B)>S1(CH2); and T1(A)>T1(CH1)>T1(CH2), T1(A)>T1(B)>T1(CH2); wherein, S1(CH1) is a lowest singlet state energy of the first composite transport material; and S1(CH2) is a lowest singlet state energy of the second composite transport material; wherein S1(B) is a lowest singlet state energy of the auxiliary material; and T1(B) is a lowest triplet state energy of the auxiliary material; and wherein T1(CH1) is a lowest triplet state energy of the first composite transport material; and T1(CH2) is a lowest triplet state energy of the second composite transport material.

3 . The organic light-emitting device according to claim 1 , wherein the first host material, the second host material and the auxiliary material satisfy,
|HOMO(A2)−LUMO(A1)|≥3.5 eV, |HOMO(A1)−LUMO(A2)|≤3 eV, and |HOMO(B)−LUMO(A2)|≥2.3 eV; wherein HOMO(A1) is a highest occupied molecular orbital HOMO energy level of the first host material, and LUMO(A1) is a lowest unoccupied molecular orbital LUMO energy level of the first host material; wherein HOMO(A2) is a highest occupied molecular orbital HOMO energy level of the second host material, and LUMO(A2) is a lowest unoccupied molecular orbital LUMO energy level of the second host material; and wherein HOMO (B) is a highest occupied molecular orbital HOMO energy level of the auxiliary material, and LUMO (B) is a lowest unoccupied molecular orbital LUMO energy level of the auxiliary material.

4 . The organic light-emitting device according to claim 3 , wherein the first host material, the second host material and the auxiliary material satisfy,
|HOMO(A1)|>|HOMO(B)|≥5.6 eV; and |LUMO(B)|>|LUMO(A2)|≥1 eV.

5 . The organic light-emitting device according to claim 1 , wherein the first host material and the auxiliary material are hole-type materials, and the second host material is an electron-type material; and
a hole mobility of the first host material is higher than a hole mobility of the auxiliary material.

6 . The organic light-emitting device according to claim 5 , wherein a difference between the hole mobility and the electron mobility of the auxiliary material is not more than two orders of magnitude.

7 . The organic light-emitting device according to claim 1 , wherein the first composite transport material and the second composite transport material satisfy,
ΔE ST (CH)≤0.3 eV; wherein, ΔE ST (CH) is an energy level difference between the lowest singlet state energy of the first composite transport material and the lowest triplet state energy of the first composite transport material, or is an energy level difference between lowest singlet state energy of the second composite transport material and the lowest triplet state energy of the second composite transport material.

8 . The organic light-emitting device according to claim 1 , wherein the auxiliary material is a delayed fluorescence material, and the auxiliary material satisfies,
ΔE ST (B)≤0.3 eV; wherein, ΔE ST (B) is an energy level difference between the lowest singlet state energy of the auxiliary material and the lowest triplet state energy of the auxiliary material.

9 . The organic light-emitting device according to claim 1 , wherein an emission spectrum of the second composite transport material is overlapped with an absorption spectrum of the dopant material, and a ratio between an overlapped area and an area of the emission spectrum of the second composite transport material is a, wherein a≥30%; and
an emission spectrum of the auxiliary material is overlapped with an absorption spectrum of the dopant material, and a ratio between an overlapped area and an area of the emission spectrum of the auxiliary material is b, wherein b≥30%.

10 . The organic light-emitting device according to claim 1 , wherein the at least one auxiliary material comprises a first auxiliary material and a second auxiliary material;
the second composite transport material comprises a first sub-composite transport material and a second sub-composite transport material; the first auxiliary material and the second host material form the first sub-composite transport material, the second auxiliary material and the second host material form the second sub-composite transport material; and the second auxiliary material and the second sub-composite transport material satisfy, S1(B2)>S1(CH22); and T1(B2)>T1(CH22); wherein, S1(B2) is a lowest singlet state energy of the second auxiliary material; and T1(B2) is a lowest triplet state energy of the second auxiliary material; and wherein S1(CH22) is a lowest singlet state energy of the second sub-composite transport material; and T1(CH22) is a lowest triplet state energy of the second sub-composite transport material.

11 . The organic light-emitting device according to claim 10 , wherein the first composite transport material, the first auxiliary material, the second auxiliary material, the first sub-composite transport material and the second sub-composite transport material satisfy,
S1(CH1)>S1(B2)>S1(B1)>S1(CH21)>S1(CH22); and T1(CH1)>T1(B2)>T1(B1)>T1(CH21)>T1(CH22); wherein, S1(CH1) is a lowest singlet state energy of the first composite transport material; and S1(CH2) is a lowest singlet state energy of the second composite transport material; wherein S1(B1) is a lowest singlet state energy of the second auxiliary material; and T1(B1) is a lowest triplet state energy of the second auxiliary material; and wherein S1(CH21) is a lowest singlet state energy of the first sub-composite transport material; T1(CH21) is the lowest triplet state energy of the first sub-composite transport material.

12 . The organic light-emitting device according to claim 10 , wherein the first auxiliary material and the second auxiliary material satisfy,
|HOMO(B2)|−|HOMO(B1)|≤0.5 eV; wherein, HOMO(B1) is a highest occupied molecular orbital HOMO energy level of the first auxiliary material, and HOMO(B2) is a highest occupied molecular orbital HOMO energy level of the second auxiliary material.

13 . The organic light-emitting device according to claim 1 , wherein the dopant material is selected from fluorescent mater

Assignees

• Boe Technology Group Co Ltd

Inventors

• Sun Haiyan
• Zhang Xiaojin
• Wang Dan
• Wang Siqi

Classifications

• H10K2101/30

  Highest occupied molecular orbital [HOMO], lowest unoccupied molecular orbital [LUMO] or Fermi energy values · CPC title

• H10K2101/90

  Multiple hosts in the emissive layer · CPC title

• H10K2101/10

  Triplet emission · CPC title

• H10K50/121

  for assisting energy transfer, e.g. sensitization · CPC title

• H10K50/00

  Organic light-emitting devices (integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36) · CPC title