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US 2020/0403166 A1Published application
Organic electroluminescent materials and devices
AssigneeUniversity of Southern California
InventorsMark E. THOMPSON, Matthew J. JUROW, Peter I. DJUROVICH, Tobias D. SCHMIDT
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Abstract
Organic light emitting devices incorporating a film of metal complex emitters that are oriented with their transition dipole moment vectors oriented parallel to the device substrate enhances the outcoupling and eliminate the need for micro-lens arrays, gratings, or other physical extraneous outcoupling methods.
Claims24
A first organic light emitting device comprising:
- a substrate;
- an anode;
- a cathode;
- and
- an organic layer, disposed between the anode and the cathode, comprising a film of heteroleptic compounds having a formula M(LA)2(LB);
- wherein LA and LB are bidentate, monoanionic ligands;
- wherein each of the compounds has a structure of
- wherein
- represents ligand LA and
- represents ligand LB;
- wherein M is a metal selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Au, and Cu;
- wherein the compound has a C2 symmetry axis and a transition dipole moment vector (TDV);
- wherein the ligand LB is symmetric with respect to the C2 symmetry axis;
- wherein the Z atoms are trans to each other and the C2 symmetry axis is perpendicular to the M-Z bonds and the TDV is coincident or nearly coincident with the M-Z bonds;
- wherein Z is C or N;
- wherein X is O, NR, CR2, or SiR2;
- wherein R is H, alkyl, or aryl;
- and
- wherein the heteroleptic compounds in the film are oriented with their C2 symmetry axis substantially perpendicular to the substrate.
16 more elements
(canceled)
A first organic light emitting device comprising:
- a substrate;
- an anode;
- a cathode;
- and
- an organic layer, disposed between the anode and the cathode, comprising a film of homoleptic compounds having a formula M(LA)3;
- wherein the compound has a structure of
- wherein
- represents LA,
- wherein M is a metal selected from the group consisting of Ir, Rh, Re, Ru, Os, Pt, Au, and Cu;
- wherein L is C or N atom;
- wherein LA is a C2 symmetric bidentate monoanionic ligand and each ligand LA's coordination to M forms a L-M-L bond angle;
- wherein each of the homoleptic compound is a C3 symmetric compound having a C3 symmetry axis and has a transition dipole moment;
- and
- wherein the homoleptic compounds in the film are oriented with their C3 symmetry axis substantially perpendicular to the substrate and the transition dipole moment for the M(LA) fragment bisects the L-M-L bond angle.
11 more elements
Dependencies are inferred from the claim text.