Patent ID: 7719182

Claim:
An organic light-emitting diode (OLED) device, comprising: first and second non-metallic transparent electrodes, and one or more layers of organic material formed between the first and second non-metallic transparent electrodes, the one or more layers of organic material including one or more light-emitting layers that emit emitted light and that emit trapped light into the first and second non-metallic transparent electrodes and the one or more layers of organic material; and a non-metallic reflective layer that reflects the emitted light located on a side of either of the first or second non-metallic transparent electrodes opposite to the one or more organic material layers; wherein the device further comprises a non-metallic light transmissive scattering layer that scatters trapped light into emitted light, external to, and in optical contact, with the organic material layers and the electrodes or wherein the non-metallic reflective layer comprises a non-metallic reflective scattering layer that scatters trapped light into emitted light, external to, and in optical contact with, the one or more organic material layers and the electrodes; a light-transmissive substrate through which the emitted light emitted by the one or more light-emitting layers is transmitted; a low-index element having an optical refractive index lower than the optical refractive index of the light-transmissive substrate, the one or more light-emitting layers; and wherein the low-index element is located between the light-transmissive substrate and the first and second non-metallic electrodes and between the light-transmissive substrate and the non-metallic light-transmissive scattering layer.