Realization of Ultra-High Color Stable Hybrid White Organic Light-Emitting Diodes via Sequential Symmetrical Doping in Emissive Layer

High performance three-color hybrid white organic light-emitting diode (WOLED) has been demonstrated by emissions from a fluorescent blue emitter 5,11-di(40-dimesitylboronphenyl) indolo[3,2-b]carbazole (DDBICZ), a phosphorescent yellow emitter bis(2-(3-trifluoromethy1-4-fluoropheny1)-4-methylquinolyl) (acetylacetonate)iridium(III) (Ir(ffpmq)(2)(acac)) and a phosphorescent red emitter bis(1-phenylisoquinoline) (acetylacetonate)iridium(III) (Ir(piq)(2)(acac)). The blue emitting DDBICZ in the device also acts as a host for Ir(ffpmq)(2)(acac) and 1r(piq)(2)(acac) dopants. The emissive layer in the DDBICZ-based hybrid WOLEDs consists of a sequential symmetric doping configuration for achieving high color stability, CIE color coordinates of (0.40, 0.41) and color rendering index of 86 over the brightness range from 10 cd/m(2) to 10,000 cd/m(2). The hybrid WOLEDs thus developed also possess a high lunnious efficiency of 25.9 cd/A.