Patent ID: 11910702
Assignee: UNIVERSAL DISPLAY CORPORATION
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
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 device 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 formula of M1(LA)x(LB)y(LC)z;
wherein LA, LB and LC are each a bidentate ligand;
wherein M1 is selected from the group consisting of Os, Ir, Pd, Pt, Cu, Ag, and Au; and
wherein x is 1, 2, or 3; y is 0, 1, or 2; z is 0, 1, or 2; and x+y+z is the oxidation state of the metal M1;
wherein LA is selected from the group consisting of:, LB and LC are each independently selected from the group consisting of:, wherein,
each X1 to X10 are independently selected from the group consisting of C and N;
at least one of X1 to X10 is N;
X is selected from the group consisting of BR′, NR′, PR′, O, S, Se, C═O, S═O, SO2, CR′R″, SiR′R″, and GeR′R″;
R′ and R″ are optionally fused or joined to form a ring;
each Ra, Rb, and Rc represents from mono substitution to the maximum possible number of substitutions, or no substitution;
R′, R″, Ra, Rb, and Rc are each independently a hydrogen or a substituent selected from the group consisting of deuterium, halide, alkyl, cycloalkyl, heteroalkyl, arylalkyl, alkoxy, aryloxy, amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acids, ester, nitrile, benzonitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof; and
any two adjacent substituents of Ra, Rb, and Rc can be fused or joined to form a ring or form a multidentate ligand;

wherein the primary phosphorescent emitter has a peak emission wavelength λmax that is ≥600 nm and ≤750 nm;
wherein the secondary emitter is a near-infrared emitter that has a peak emission wavelength λmax that is between 750 nm and 2500 nm;
wherein the first host has a lowest excited state triplet energy T1 that is at least 0.1 eV higher than that of the primary phosphorescent emitter;
wherein the secondary emitter is selected from the group consisting of: a fluorescent emitter, a thermally activated delayed fluorescence emitter, and an emitter containing an unpaired electron in its ground state,
whereby Dexter energy transfer from the primary emitter to the secondary emitter is minimized to prevent formation of fluorophore triplet excitons.