	US 12,239,013 B2
	Organic electroluminescent devices
Eric A. Margulies, Ewing, NJ (US); Zhiqiang Ji, Ewing, NJ (US); Nicholas J. Thompson, Ewing, NJ (US); Geza Szigethy, Newtown, PA (US); Michael S. Weaver, Ewing, NJ (US); and Jerald Feldman, Wilmington, DE (US)
Assigned to UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed by Universal Display Corporation, Ewing, NJ (US)
Filed on Aug. 3, 2023, as Appl. No. 18/364,552.
Application 18/364,552 is a continuation of application No. 16/158,406, filed on Oct. 12, 2018, granted, now 11,910,702.
Claims priority of provisional application 62/582,359, filed on Nov. 7, 2017.
Prior Publication US 2023/0380265 A1, Nov. 23, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H10K 85/30 (2023.01); H10K 50/11 (2023.01); H10K 50/125 (2023.01); H10K 50/13 (2023.01); H10K 50/17 (2023.01); H10K 50/18 (2023.01); H10K 50/81 (2023.01); H10K 50/82 (2023.01); H10K 50/15 (2023.01); H10K 50/16 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01)

CPC H10K 85/351 (2023.02) [H10K 50/11 (2023.02); H10K 50/125 (2023.02); H10K 50/131 (2023.02); H10K 50/171 (2023.02); H10K 50/18 (2023.02); H10K 50/81 (2023.02); H10K 50/82 (2023.02); H10K 85/342 (2023.02); H10K 85/346 (2023.02); H10K 85/348 (2023.02); H10K 85/371 (2023.02); H10K 50/15 (2023.02); H10K 50/16 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02)]

18 Claims

1. An organic light emitting device (OLED) comprising:

an anode;

a cathode;

a first organic layer, disposed between the anode and the cathode;

wherein the first organic layer comprises a primary phosphorescent emitter and a first host;

wherein one of the following conditions is true:

(1) the first organic layer further comprises a secondary emitter; or

(2) the OLED further comprises a second organic layer disposed between the anode and the cathode, wherein the second organic layer comprises a secondary emitter;

wherein the primary phosphorescent emitter has a peak emission wavelength λmax that is ≥600 nm and ≤750 nm;

wherein the secondary emitter has a peak emission wavelength λmax that is ≥750 nm;

wherein the primary phosphorescent emitter is capable of transferring energy to the secondary emitter;

wherein the first host has a lowest excited state triplet energy Tl that is at least 0.1 eV higher than that of the primary phosphorescent emitter;

wherein the primary phosphorescent emitter has the formula Pt(L¹)_m;

wherein L¹can represent one or more ligands that are the same or different;

wherein each L¹is independently monodentate or multidentate;

wherein m represents a maximum possible number of ligands L¹that can coordinate to Pt.