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US 8,008,856 B2Granted
Light emitting devices with agent to increase the fraction of excitons formed as a singlet
AssigneeMassachusetts Institute of Technology
InventorsMichael Segal, Kelley Rivoire, Madhusudan Singh, Marc A. Baldo
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Abstract
A light emitting device comprising a first electrode, a second electrode, an emissive material between the first and second electrodes and a mixing agent separate from the emissive material is disclosed. In certain examples, the mixing agent may be effective to increase a fraction of excitons formed as a singlet state.
Claims24
A light emitting device configured to emit light by fluorescence comprising:
- a first electrode;
- a second electrode;
- an emissive material between the first and second electrodes;
- and
- a non-emissive mixing agent layer separate from the emissive material and between at least one of the first electrode and the emissive material or the second electrode and the emissive material, the mixing agent layer is effective to mix charge transfer states to increase the fraction of excitons formed as a singlet state.
2 more elements
A method of providing a light emitting device configured to emit light by fluorescence comprising:
- providing a first electrode, a second electrode, and an emissive material between the first electrode and the second electrode;
- and
- providing a non-emissive mixing agent layer between the first electrode and the second electrode and separate from the emissive material, the mixing agent layer is effective to mix exciton precursor states to increase the fraction of excitons formed as a singlet state.
Dependencies are inferred from the claim text.