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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41424

Title: Carbazole–benzimidazole hybrid bipolar host materials for highly efficient green and blue phosphorescent OLEDs
Authors: You-Ming Chen;Wen-Yi Hung;Hong-Wei You;Atul Chaskar;Hao-Chun Ting;Hsiao-Fan Chen;Ken-Tsung Wong;Yi-Hung Liu
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2011
Issue Date: 2017-02-15T08:25:00Z
Publisher: Journal of Materials Chemistry
Abstract: Abstract: In this study, we synthesized a series of bipolar hosts (CbzCBI, mCPCBI, CbzNBI, and mCPNBI) containing hole-transporting carbazole and electron-transporting benzimidazole moieties and then examined the morphological, thermal, and photophysical properties and carrier mobilities of these bipolar host materials. Altering the linking topology (C- or N-connectivity of the benzimidazole) changed the effective conjugation length and led to different excited-state solvent relaxation behavior. The N-connected compounds (CbzNBI, mCPNBI) possessed higher triplet energies (ET) than those of their C-connected analogues (CbzCBI, mCPCBI) by 0.23 eV. The higher values of ET of CbzNBI and mCPNBI endowed them with the ability to confine triplet excitons on the blue-emitting guest. A blue PhOLED device incorporating mCPNBI achieved a maximum external quantum efficiency, current efficiency, and power efficiency of 16.3%, 35.7 cd A−1, and 23.3 lm W−1, respectively; confirming the suitability of using N-connected bipolar hosts for the blue phosphor. The donor/acceptor interactions of the C-connected analogue resulted in a lower triplet energy, making it a suitable bipolar host for green phosphors. A green-phosphorescent device incorporating CbzCBI as the host doped with (PBi)2Ir(acac) achieved a maximum external quantum efficiency, current efficiency, and power efficiency of 20.1%, 70.4 cd A−1, and 63.2 lm W−1, respectively.
Relation: 21(38)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41424
Appears in Collections:[光電科學研究所] 期刊論文

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