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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51354

Title: Fine-Tuning the Balance Between Carbazole and Oxadiazole Units in Bipolar Hosts to Realize Highly Efficient Green PhOLEDs
Authors: Shuo-Hsien Cheng
Shu-Hua Chou
Wen-Yi Hung
Hong-Wei You
You-Ming Chen
Atul Chaskar
Yi-Hung Liu
Ken-Tsung Wong
Contributors: 國立臺灣海洋大學:光電與材料科技學士學位學程(學系)
Keywords: PhOLEDs
Bipolar host
Carbazole/oxadiazole
Date: 2013-04
Issue Date: 2018-11-23T06:33:05Z
Publisher: Organic Electronics
Abstract: Abstract: A series of new bipolar hosts C1O1, C2O1, and C1O2 comprising hole-transporting carbazole as donor (D) and electron-transporting oxadiazole as acceptor (A) have been designed and synthesized to tune D/A ratio with a view for getting in-depth information about structure–property–performance relationship. The D/A ratio exerts subtle influences on absorption spectra and energy levels. Time-of-flight (TOF) measurements reveal that the increment of donor units effectively increase the hole mobility. The appropriate energy levels and triplet energies along with promising morphological and thermal stability of these molecules bring out them as suitable hosts to realize green PhOLEDs with (PBi)2Ir(acac) and (PPy)2Ir(acac) emitters. Green phosphorescent devices hosted by C1O1, C2O1, and C1O2 achieved maximum external quantum efficiencies of 20.7%, 20.4%, and 17.3%, respectively. These results indicate that carbazole/oxadiazole hybrid molecule with one carbazole and oxadiazole each is a better candidate for highly efficient green PhOLEDs.
Relation: 14(4) pp.1086–1093
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51354
Appears in Collections:[光電科學研究所] 期刊論文

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