Abstract: The present invention includes fused tetraphenylene compounds that may be used as charge transporters, hosts or emitters in OLEDs.

Abstract: Organic compounds consisting of indolo[321-jk]carbazole and carbazole are disclosed. The compounds are useful as host materials in OLEDs and can improve OLED performance.

Abstract: A light emitting device with high light emission uniformity is disclosed. The device contains a first electrically conductive layer having a positive polarity and an electrically conductive uniformity enhancement layer in contact with the first electrically conductive layer. The device also contains a second electrically conductive layer having a negative polarity and a light-emitting structure situated between the first and the second electrically conductive layers. The light-emitting structure contains an organic material in direct contact with the second electrically conductive layer. The uniformity enhancement layer transmits essentially all wavelengths of light emitted by the light-emitting structure. Compared to devices lacking a uniformity enhancement layer, the device exhibits higher spatial uniformity in luminance and in color spectrum.