Highly Efficient White Organic Light-emitting Devices with Optimized Electron Transporting Layers

doi:10.1007/s40242-017-6421-6

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (2): 227-230.doi: 10.1007/s40242-017-6421-6

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Highly Efficient White Organic Light-emitting Devices with Optimized Electron Transporting Layers

ZHANG Tianyu¹, ZHENG Yu¹, WANG Chengming¹, ZHANG Yixin¹, LIU Shihao², MA Jian³, ZHANG Letian², XIE Wenfa², CHEN Ping², LIN Jun¹, LIU Yujuan¹

1. Key Laboratory of Geo-exploration Instruments, Ministry of Education, College of Instrumentation and Electrical Engineering, Jilin University, Changchun 130061, P. R. China;
2. State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, P. R. China;
3. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China

Received:2016-10-13 Revised:2016-12-15 Online:2017-04-01 Published:2017-01-12
Contact: LIN Jun,E-mail:lin_jun@jlu.edu.cn;LIU Yujuan,E-mail:xuliuyujuan@163.com E-mail:lin_jun@jlu.edu.cn;xuliuyujuan@163.com
Supported by:
Supported by the National Natural Science Foundation of China(Nos.61306055, 61306054, 61177026), the China Postdoctoral Science Foundation Funded Project(Nos.2013M530141, 2014T70290), the Project of Science and Technology Office of Jilin Province, China(Nos.20150520096JH, 20170101200JC).

Abstract

Abstract:

We fabricated three phosphorescent blue organic light-emitting devices based on blue phosphor of iridium(III) bis[(4,6-difluorophenyl)-pyridinato-N,C2'](Firpic) with different electron transporting layer(ETL) materials. By analyzing efficiency curves and spectral characteristics, the significant effect of ETL on many aspects of device performance was demonstrated. With optimized ETL, the characteristics of devices, such as voltage and efficiency were significantly improved. Combined with a yellow phosphor of iridium(III) bis(4-phenylthieno[3,2-c]pyridinatoN,C2') acetylacetonate(PO-01), phosphorescent white organic light-emitting devices(PhWOLEDs) were obtained. Then, with an aim to promote the performance of the PhWOLEDs, a thin layer of 4,4',4″-tri(N-carbazolyl)-triphenylamine(TCTA) was introduced between two light emission layers, and the diffusion of excitons was confined. The outperformance device fabricated with 4,7-diphenyl-1,10-phenanthroline(Bphen) as the electron transporting layer exhibited a peak current efficiency of 36.6 cd/A, a peak power efficiency of 19.2 lm/W, and the International Commission on Illumination coordinates(0.37, 0.46).

Key words: White organic light-emitting device, High efficiency, Optimized electron transporting layer

ZHANG Tianyu, ZHENG Yu, WANG Chengming, ZHANG Yixin, LIU Shihao, MA Jian, ZHANG Letian, XIE Wenfa, CHEN Ping, LIN Jun, LIU Yujuan. Highly Efficient White Organic Light-emitting Devices with Optimized Electron Transporting Layers[J]. Chemical Research in Chinese Universities, 2017, 33(2): 227-230.

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Highly Efficient White Organic Light-emitting Devices with Optimized Electron Transporting Layers

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