OLED device having enhancement layer(s)
AssigneeUniversal Display Corporation
InventorsNicholas J. Thompson, Marc A. Baldo, Michael S. Weaver, Vinod M. Menon
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Abstract
A method for improving the operation of an OLED includes maximizing on-radiative transfer of excited state energy from the OLED's organic emissive material to surface plasmon polaritons in an enhancement layer by providing the enhancement layer no more than a threshold distance away from the organic emissive layer; and emitting light into free space from the enhancement layer by scattering the energy from the surface plasmon polaritons through an outcoupling layer that is provided proximate to the enhancement layer but opposite from the organic emissive layer.
Claims15
A device comprising:
- a substrate;
- a first electrode;
- an organic emissive layer comprising an organic emissive material disposed over the electrode;
- an enhancement layer, comprising a plasmonic material exhibiting surface plasmon resonance that non-radiatively couples to the organic emissive material and transfer excited state energy from the emissive material to non-radiative mode of surface plasmon polaritons, disposed over the organic emissive layer opposite from the first electrode,
- wherein the enhancement layer is provided no more than a threshold distance away from the organic emissive layer,
- wherein the organic emissive material has a total non-radiative decay rate constant and a total radiative decay rate constant due to the presence of the enhancement layer, and the threshold distance is where the total non-radiative decay rate constant is equal to the total radiative decay rate constant;
- and
- an outcoupling layer disposed over the enhancement layer, wherein the outcoupling layer scatters the energy from the surface plasmon polaritons as photons to free space.
Dependencies are inferred from the claim text.