Abstract
Color-stable, high-efficiency fluorescent pure-white organic light-emitting diodes were fabricated using an electroluminescence-efficient blue host 2-(N,N -diphenylamino)-6-[4-(N,N -diphenylamino)styryl]naphthalene and yellow 5,6,11,12-tetra-phenylnaphthacene in a single emissive layer. The resultant power efficiency, at 100 cd m 2 , for example, was 9.5 lmW, and its emission changed from (0.321, 0.357) to (0.315, 0.344) for brightness increasing from 100 to 10 000 cd m 2 . The high color stability may be attributed to the device structure enabling the generation of excitons on host so that lesser excitons would form on guest, preventing exciton-quenching-caused blueshift. © 2008 American Institute of Physics.