Patent ID: 8742657

Claim:
A first device, comprising: a pixel comprising: a first subpixel comprising: a first organic light emitting device comprising a first material that is an emitting material having a first emissive spectrum; and a first triplet-triplet annihilation up conversion layer disposed adjacent to the first organic light emitting device such that light emitted by the organic light emitting device is incident on the first triplet-triplet annihilation up conversion layer, the first triplet-triplet annihilation up conversion layer comprising a first donor material and a first acceptor material, wherein the first donor material has an absorption spectrum that overlaps with the first emissive spectrum; a second subpixel comprising a second organic light emitting device comprising a second material that is an emitting material having a second emissive spectrum with a peak wavelength of about 500 nm to about 600 nm; and a third subpixel comprising a third organic light emitting device comprising a third material that is an emitting material having a third emissive spectrum with a peak wavelength of about 600 nm to about 700 nm.