Efficient Phosphorescent White Organic Light-Emitting Diodes Using Ir(4-Me-2,3-dpq)(2)(przl-C6H4F) as a Red Emitter

초록

We demonstrated white organic light-emitting diodes (WOLED) using the iridium bis(4-methyl-2,3-phenylquinolinato-N,C-2) fluorophenylpyrazolonate complex (Ir(4-Me-2,3-dpq)(2)(przl-C6H4F)) as a phosphorescent red dopant and iridium bis[(4,6-difluorophenyl)-pyridinato-N,C-2] picolinate (Flrpic) as a phosphorescent blue dopant. The WOLED with Ir(4-Me-2,3-dpq)(2)(przl-C6H4F) had better exciton confinement in emitting layer and indicated smaller movement of exciton than the WOLED with iridium bis(2-phenylquinoline) acetylacetonate (Ir(2-pq)(2)(acac)) as phosphorescent red dopant. The optimized WOLED had a peak external quantum efficiency of 7.16%, current efficiency of 11.84 cd/A, and Commission Internationale de l'Eclairage (CIEx,y) coordinates of (0.35, 0.32). The WOLED also exhibited the minimal change with Delta CIEx,y coordinates of +/-(0.01, 0.00) from 100 to 4000 cd/m(2).

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