	US 12,262,636 B2
	Organic electroluminescent devices and preparation methods thereof
Lian Duan, Kunshan (CN); Xiaozeng Song, Kunshan (CN); Dongdong Zhang, Kunshan (CN); and Jinbei Wei, Kunshan (CN)
Assigned to KUNSHAN GO-VISIONOX OPTO-ELECTRONICS CO., LTD., Kunshan (CN); and TSINGHUA UNIVERSITY, Beijing (CN)
Filed by Kunshan Go-Visionox Opto-Electronics Co., Ltd., Kunshan (CN); and TSINGHUA UNIVERSITY, Beijing (CN)
Filed on Nov. 12, 2019, as Appl. No. 16/680,518.
Application 16/680,518 is a continuation of application No. PCT/CN2018/089396, filed on May 31, 2018.
Claims priority of application No. 201711479570.3 (CN), filed on Dec. 29, 2017.
Prior Publication US 2020/0083460 A1, Mar. 12, 2020
Int. Cl. H10K 85/60 (2023.01); H10K 50/11 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 50/81 (2023.01); H10K 50/82 (2023.01); H10K 85/30 (2023.01); H10K 85/40 (2023.01); H10K 101/10 (2023.01)

CPC H10K 85/6572 (2023.02) [H10K 85/322 (2023.02); H10K 85/40 (2023.02); H10K 85/622 (2023.02); H10K 85/623 (2023.02); H10K 85/624 (2023.02); H10K 85/633 (2023.02); H10K 85/653 (2023.02); H10K 85/654 (2023.02); H10K 50/11 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 50/81 (2023.02); H10K 50/82 (2023.02); H10K 2101/10 (2023.02)]

19 Claims

1. An organic electroluminescent device comprising:

a light-emitting layer, the light-emitting layer including:

a host material that is an exciplex formed by an electron donor material and an electron acceptor material, wherein the electron donor material comprises:

wherein the electron acceptor material is a compound containing a triazine group;

an auxiliary host material that is a thermally activated delayed fluorescence material; and

a fluorescent dye;

wherein the triplet energy level (T₁) of the exciplex is higher than the singlet energy level (S₁) of the auxiliary host material, the triplet energy level (T₁) of the auxiliary host material is higher than the singlet energy level (S₁) of the fluorescent dye, an energy level difference between the singlet energy level (S₁) and the triplet energy level (T₁) of the exciplex is less than 0.15 eV, and the exciplex has a band gap narrower than the band gap of mCBP.