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US 11,678,499 B2Granted
Use of singlet-triplet gap hosts for increasing stability of blue phosphorescent emission
AssigneeUniversal Display Corporation
InventorsNicholas J. Thompson, Jerald Feldman, Julia J. Brown
Life of this patent
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Abstract
Arrangements for phosphorescent blue emissive materials, layers, and devices are provided. The arrangements include a host having first a triplet energy level of at least 2.8 eV and an absolute difference of not more than 0.3 eV between the first singlet and triplet energy levels, and an emitter that includes an emissive transition metal complex and a first triplet energy level of at least 2.7 eV.
Claims15
An organic light emitting device comprising:
- an anode;
- a cathode;
- and
- an organic layer disposed between the anode and the cathode, the organic layer comprising an organic host material and an emissive transition metal complex having the formula M(L1)x(L2)y(L3)z;
- wherein each Ll, L2 and L3 is different
- wherein x is 1 or 2;
- wherein y is 1 or 2;
- wherein z is 0, 1, or 2;
- wherein x+y+z is the oxidation state of the metal M;
- wherein M is selected from the group consisting of:
- Re, Rh, Ir, Pd, Pt, Os, and Au;
- wherein the host has a first triplet energy T1H and a first singlet energy S1H;
- wherein the emissive transition metal complex has a first triplet energy T1E;
- wherein T1H is at least 2.8 eV;
- wherein T1E is 2.70 eV or greater;
- wherein T1H>T1E;
- and
- wherein the absolute energy difference between T1H and S1H is not more than 0.3 eV;
- wherein L1, L2 and L3 are each independently selected from the group consisting of:
- wherein each X1 to X11 are independently selected from the group consisting of carbon and nitrogen;
- wherein 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″;
- wherein R′ and R″ are optionally fused or joined to form a ring;
- wherein each Ra, Rb, Rc, and Rd may represent from mono substitution to the possible maximum number of substitution, or no substitution;
- wherein R′, R″, Ra, Rb, Rc, and Rd are each independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, cyclic amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
- and
- wherein any two Ra, Rb, Rc, and Rd are optionally fused or joined to form a ring or form a multidentate ligand.
23 more elements
A consumer product comprising an organic light-emitting device (OLED) comprising:
- an anode;
- a cathode;
- and
- an organic layer disposed between the anode and the cathode, the organic layer comprising an organic host material and an emissive transition metal complex having the formula M(L1)x(L2)y(L3)z;
- wherein each L1, L2 and L3 is different
- wherein x is 1 or 2;
- wherein y is 1 or 2;
- wherein z is 0, 1, or 2;
- wherein x+y+z is the oxidation state of the metal M;
- wherein M is selected from the group consisting of:
- Re, Rh, Ir, Pd, Pt, Os, and Au;
- wherein the host has a first triplet energy LH and a first singlet energy S1H;
- wherein the emissive transition metal complex has a first triplet energy T1E;
- wherein T1H is at least 2.8 eV;
- wherein T1E is 2.70 eV or greater;
- wherein T1H>T1E;
- and
- wherein the absolute energy difference between T1H and S1H is not more than 0.3 eV;
- wherein L1, L2 and L3 are each independently selected from the group consisting of:
- wherein each X1 to X11 are independently selected from the group consisting of carbon and nitrogen;
- wherein 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″;
- wherein R′ and R″ are optionally fused or joined to form a ring;
- wherein each Ra, Rb, Rc, and Rd may represent from mono substitution to the possible maximum number of substitution, or no substitution;
- wherein R′, R″, Ra, Rb, Rc, and Rd are each independently selected from the group consisting of hydrogen, deuterium, halogen, alkyl, cycloalkyl, heteroalkyl, heterocycloalkyl, arylalkyl, alkoxy, aryloxy, amino, cyclic amino, silyl, alkenyl, cycloalkenyl, heteroalkenyl, alkynyl, aryl, heteroaryl, acyl, carbonyl, carboxylic acid, ether, ester, nitrile, isonitrile, sulfanyl, sulfinyl, sulfonyl, phosphino, and combinations thereof;
- and
- wherein any two Ra, Rb, Rc, and Rd are optionally fused or joined to form a ring or form a multidentate ligand.
23 more elements
Dependencies are inferred from the claim text.