	US 12,295,199 B2
	Phosphorescence-sensitized delayed fluorescence light emitting system
Woo-Young So, Richboro, PA (US); Jui-Yi Tsai, Newtown, PA (US); and Chuanjun Xia, Lawrenceville, NJ (US)
Assigned to UNIVERSAL DISPLAY CORPORATION, Ewing, NJ (US)
Filed by Universal Display Corporation, Ewing, NJ (US)
Filed on May 18, 2023, as Appl. No. 18/319,732.
Application 18/319,732 is a continuation of application No. 17/097,368, filed on Nov. 13, 2020, granted, now 11,696,459.
Application 17/097,368 is a continuation of application No. 13/794,937, filed on Mar. 12, 2013, granted, now 10,957,870.
Claims priority of provisional application 61/697,986, filed on Sep. 7, 2012.
Prior Publication US 2023/0337452 A1, Oct. 19, 2023
Int. Cl. H10K 50/12 (2023.01); H10K 50/11 (2023.01); H10K 50/80 (2023.01); H10K 85/30 (2023.01); H10K 85/60 (2023.01); H10K 101/10 (2023.01); H10K 101/30 (2023.01); H10K 101/40 (2023.01)

CPC H10K 50/121 (2023.02) [H10K 50/11 (2023.02); H10K 50/80 (2023.02); H10K 85/371 (2023.02); H10K 85/341 (2023.02); H10K 85/6572 (2023.02); H10K 2101/10 (2023.02); H10K 2101/30 (2023.02); H10K 2101/40 (2023.02)]

20 Claims

1. A device comprising:

an emissive region, said emissive region comprising:

a first material as an emitter that is an acceptor; and

a phosphorescent-capable second material as a sensitizer;

wherein the first material and the second material each has a first singlet state and a first triplet state;

wherein the first triplet state of the second material is not lower than the first triplet state of the first material;

wherein the second material is an Ir organometallic complex, or a Pt organometallic complex;

wherein, when a voltage is applied across the device, the second material transfers excitons to the first singlet state and the triplet state of the first material; and

wherein the excitons that are transferred to the first triplet state of the first material are activated to the first singlet state of the first material through a thermal activation process.