Efficient Phosphorescent White Organic Light-Emitting Diodes Using Ir(4-Me-2,3-dpq)2(przl-C6H4F) as a Red Emitter
We demonstrated white organic light-emitting diodes (WOLED) using the iridium bis(4-methyl-2,3-phenylquinolinato-N,C2) fluorophenylpyrazolonate complex (Ir(4-Me-2,3-dpq)2(przl-C6H4F)) as a phosphorescent red dopant and iridium bis[(4,6-difluorophenyl)-pyridinato-N,C2] picolinate (FIrpic) 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 I'Eclairage (CIE x,y ) coordinates of (0.35, 0.32). The WOLED also exhibited the minimal change with ΔCIE x,y coordinates of ±(0.01, 0.00) from 100 to 4000 cd/m2.
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Document Type: Research Article
Publication date: 2011-08-01
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