METAL-ASSISTED DELAYED FLUORESCENT MATERIALS AS CO-HOST MATERIALS FOR FLUORESCENT OLEDS
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Abstract
A light emitting device includes a first electrode, a hole transporting layer in contact with the first electrode, a second electrode, an electron transporting layer in contact with the second electrode; and an emissive layer between the hole transporting layer and the electron transporting layer. The emissive layer includes a metal-assisted delayed fluorescent (MADF) emitter, a fluorescent emitter, and a host, and the MADF emitter harvests electrogenerated excitons and transfers energy to the fluorescent emitter.
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Citations
57 Claims
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1-29. -29. (canceled)
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30. A light emitting device comprising:
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a first electrode; a hole transporting layer in contact with the first electrode; a second electrode; an electron transporting layer in contact with the second electrode; and an emissive layer between the hole transporting layer and the electron transporting layer, wherein the emissive layer comprises a donor, an acceptor, and a host, wherein; the donor is a metal-assisted delayed fluorescent (MADF) emitter that demonstrates an emission spectrum consisting of dual emission characteristics from delayed fluorescence and phosphorescence, the acceptor is a fluorescent emitter, the delayed fluorescence emission energy of the donor is greater than the emission energy of the acceptor and the phosphorescence emission energy of the donor is greater than or less than the emission energy of the acceptor, such that an emission spectrum of the donor partially overlaps in wavelength with an absorption spectrum of the acceptor, and dipole coupling between the donor in an excited state and the acceptor in a ground state allows a transfer of energy from the donor to the acceptor. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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Specification