Seo Ji Hoon, Park Hye Rim, Kim Young Kwan, Ha Yunkyoung
Department of Information Display, Hongik University, Seoul, 121-791, Korea.
J Nanosci Nanotechnol. 2011 Aug;11(8):7198-201. doi: 10.1166/jnn.2011.4800.
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 (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 (CIE(x,y)) coordinates of (0.35, 0.32). The WOLED also exhibited the minimal change with delta CIE(x,y) coordinates of +/- (0.01, 0.00) from 100 to 4000 cd/m2.
我们展示了使用双（4-甲基-2,3-苯基喹啉-N,C2）氟苯基吡唑啉酮配合物（Ir(4-Me-2,3-dpq)2(przl-C6H4F)）作为磷光红色掺杂剂以及双[（4,6-二氟苯基）吡啶-N,C2]吡啶甲酸铱（Flrpic）作为磷光蓝色掺杂剂的白色有机发光二极管（WOLED）。与使用双（2-苯基喹啉）乙酰丙酮铱（Ir(2-pq)2(acac)）作为磷光红色掺杂剂的WOLED相比，含有Ir(4-Me-2,3-dpq)2(przl-C6H4F)的WOLED在发光层中具有更好的激子限制，并且激子移动更小。优化后的WOLED的峰值外量子效率为7.16%，电流效率为11.84 cd/A，国际照明委员会（CIE(x,y)）坐标为(0.35, 0.32)。该WOLED在100至4000 cd/m2范围内的CIE(x,y)坐标变化量最小，为±(0.01, 0.00)。
