High efficiency in solution processed blue phosphorescent organic light-emitting diodes using an alcohol soluble emitting layer

作者：Yook Kyoung Soo; Lee Jun Yeob^*

来源：Organic Electronics, 2011, 12(10): 1595-1599.

DOI：10.1016/j.orgel.2011.06.018

• High triplet energy host
• Solution process
• Blue phosphorescent organic light-emitting diodes
• High efficiency

High efficiency solution processed blue and deep blue phosphorescent organic light-emitting diodes (PHOLEDs) were developed using an alcohol soluble 2,7-bis(diphenylphosphoryl)-9-phenyl-9H-carbazole (PPO27) as the host material for the emitting layer. Iridium(III) bis (4,6-(di-fluorophenyl)-pyridinato-N,C') picolinate (FIrpic) and iridium(III) bis((3,5-difluoro-4- cyanophenyl) pyridinato-N,C') picolinate (FCNIrpic) were doped into the PPO27 host using 2-propanol as the solvent for the emitting layer. The alcohol soluble PPO27:FIrpic and PPO27:FCNIrpic emitting layers could form an orthogonal film with an organic soluble hole transport layer and high quantum efficiency of 14.6% and 13.4% was achieved in the PPO27:FIrpic and PPO27: FCNIrpic devices, respectively. Sky blue color coordinate of (0.15, 0.36) was obtained in the PPO27:FIrpic device, while blue shifted color coordinate of (0.15, 0.26) was realized in the PPO27:FCNIrpic device.

• 出版日期2011-10