Intersystem crossing agents for efficient utilization of excitons in organic light emitting devices
AssigneesThe Trustees of Princeton University, University of Southern California
InventorsStephen R. Forrest, Mark E. Thompson, Marc A. Baldo
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Abstract
Organic light emitting devices are described wherein the emissive layer comprises a host material containing a fluorescent or phosphorescent emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, wherein an intersystem crossing molecule of optical absorption spectrum matched to the emission spectrum of the emissive molecule enhances emission efficiency.
Claims19
An organic light emitting device comprising a heterostructure for producing luminescence, comprising an emissive layer,
- wherein the emissive layer is a combination of a host material and an emissive molecule, present as a dopant in said host material;
- wherein the emissive molecule is adapted to luminesce when a voltage is applied across the heterostructure;
- and
- wherein the heterostructure comprises an intersystem crossing molecule such that the efficiency of the emission is enhanced by the use of the intersystem crossing molecule.
An organic light emitting device comprising a heterostructure for producing luminescence, comprising an emissive layer,
- wherein the emissive layer is a combination of a conductive host material and a fluorescent emissive molecule, present as a dopant in said host material;
- wherein the emissive molecule is adapted to luminesce when a voltage is applied across the heterostructure;
- and
- wherein the heterostructure comprises an intersystem crossing molecule which is an efficient phosphor whose emission spectrum substantially overlaps with the absorption spectrum of the emissive molecule.
An organic light emitting device comprising a heterostructure for producing luminescence, comprising:
- an emission layer comprising
- a host material;
- and
- an emissive molecule, present as a dopant in said host
- material, adapted to luminesce when a voltage is applied across the heterostructure;
- a hole transport layer;
- an electron transport layer;
- and
- an intersystem crossing agent wherein there is substantial spectral overlap between the emission spectrum of the intersystem crossing agent and the absorption spectrum of the emissive molecule.
Dependencies are inferred from the claim text.