High morphology stability and ambipolar transporting host for use in blue phosphorescent single-layer organic light-emitting diodes |
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Authors: | Fang-Ming Hsu Liang-Jung Chien Kuan-Ting Chen Ya-Ze Li Shun-Wei Liu |
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Affiliation: | 1. Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan, Republic of China;2. Department of Chemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan, Republic of China;3. Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan, Republic of China |
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Abstract: | The authors report a small molecule host of 2,7-bis(diphenylphosphoryl)-9-4-(N,N-diphenylamino)phenyl]-9-phenylfluorene (POAPF) doped with 8 wt% iridium(III)-bis(4,6-difluorophenyl)pyridinato-N,C2′]picolinate (FIrpic) for use in efficient and single-layer blue phosphorescent organic light-emitting diodes (PHOLEDs) exhibiting a maximum external quantum efficiency of ∼20.3% at brightness of 100 cd/m2. The high performance of such single layer PHOLEDs is attributed to the POAPF host’s high morphological stability, suitable triplet energy level, and equal charge carrier mobilities of hole and electron to form the broad carrier recombination zone in the emitting layer, thus reducing the triplet-triplet annihilation and resulting in a slight efficiency roll off of 0.5% from the brightness of 1 and 1000 cd/m2. This work also systematically investigated the arrangement of the POAPF:FIrpic recombination zone for optimizing the performance of the single layer PHOLED. |
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Keywords: | Single layer Phosphorescent materials Organic light-emitting diode Ambipolar host Morphological stability Recombination zone |
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