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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41421

Title: A carbazole-phenylbenzimidazole hybrid bipolar universal host for high efficiency RGB and white PhOLEDs with high chromatic-stability
Authors: Wen-Yi Hung;Liang-Chen Chi;Wei-Jiun Chen;Ejabul Mondal;Shu-Hua Chou;Ken-Tsung Wong;Yun Chi
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2011
Issue Date: 2017-02-15T08:10:16Z
Publisher: Journal of Materials Chemistry
Abstract: Abstract: A novel bipolar molecule CNBzIm comprised of electron-donating carbazole and electron-accepting phenylbenzimidazole is designed, synthesized and characterized for RGB phosphorescent organic light emitting diodes (PhOLEDs). CNBzIm exhibits promising properties such as high triplet energy (ET = 2.71 eV) due to disrupted π-conjugation, bipolar and balanced charge transport ability (μh ≈ μe ≈ 10−5 cm2 V−1s−1), and high morphological stability (Tg = 185 °C). PhOLEDs adopted CNBzIm as a host respectively doped with Os(bpftz)2(PPh2Me)2, (PPy)2Ir(acac) and FIrpic under the same device structure show excellent performance with external quantum efficiencies (ηext) as high as 19.1% for red, 17.8% for green, and 12.7% for blue. A two-color, all-phosphor and single-emitting-layer WOLED hosted by CNBzIm was achieved with a maximum ηext of 15.7%, current efficiency (ηc) of 35 cd A−1, and power efficiency (ηp) of 36.6 lm W−1. Utilizing a bipolar host with balanced mobilities, WOLED can effectively broaden its recombination zone and show high color stability. The Commission Internationale de L'Eclairage (CIE) coordinates of the WOLED remain almost constant when the brightness goes from 1700 cd m−2 (0.32, 0.41) to 49 900 cd m−2 (0.31, 0.41).
Relation: 21
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41421
Appears in Collections:[光電科學研究所] 期刊論文

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