White organic light-emitting devices based on 4, 4′ -bis (2, 2′ -diphenyl vinyl)- 1, 1′ -biphenyl and phosphorescence sensitized 5,6,11,12-tetraphenylnaphthacene

Abstract

We report white organic light-emitting devices (WOLEDs) based on 4, 4′ -bis (2, 2′ -diphenyl vinyl)- 1, 1′ -biphenyl (DPVBi) and phosphorescence sensitized 5,6,11,12-tetraphenylnaphthacene (rubrene). In the devices, DPVBi acts as a blue light-emitting layer, and rubrene sensitized by a phosphorescent material, fac tris (2-phenylpyridine) iridium [Ir (ppy)3], acts as a yellow light-emitting layer. The devices have a maximum brightness of 8633 cd m2 (at a driving voltage of 22 V). The maximum luminous efficiency is 9.22 cdA (at a current density of 0.90 mA cm2). Commission international De L'Eclairage coordination of (0.30,0.37) is obtained for luminance ranging from 100 to 1000 cd m2. © 2005 American Institute of Physics.