US 12,010,859 B2
Organic electroluminescent materials and devices
Chun Lin, Yardley, PA (US); Tyler Fleetham, Newtown, PA (US); and Michael S. Weaver, Princeton, NJ (US)
Assigned to UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed by UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed on May 5, 2020, as Appl. No. 16/867,073.
Claims priority of provisional application 62/852,415, filed on May 24, 2019.
Prior Publication US 2020/0373510 A1, Nov. 26, 2020
Int. Cl. H01L 51/50 (2006.01); H10K 50/11 (2023.01); H10K 101/00 (2023.01); H10K 101/10 (2023.01)
CPC H10K 50/11 (2023.02) [H10K 2101/10 (2023.02); H10K 2101/27 (2023.02)] 19 Claims
OG exemplary drawing
 
1. An organic light emitting device (OLED) comprising, sequentially:
an anode;
a hole transporting layer;
an emissive region;
an electron transporting layer; and
a cathode; wherein the emissive region comprises:
a first compound;
a second compound; and
a third compound;
wherein the first compound is capable of functioning as a phosphorescent emitter in an OLED at room temperature;
wherein the second compound meets at least one of the following conditions:
(1) the second compound is capable of functioning as a TADF emitter in an OLED at room temperature; and
(2) the second compound is capable of forming an exciplex with the first compound in an OLED at room temperature;
wherein the third compound is a fluorescent compound functioning as an emitter in said OLED at room temperature; and
wherein the OLED emits a luminescent emission comprising an emission component from the S1 energy of the third compound when a voltage is applied across the OLED, wherein at least 65% of the emission from the OLED is produced from the third compound with a luminance of at least 10 cd/m2.