DocumentCode :
2147871
Title :
Improved white organic light-emitting devices with dual-emission-layer design
Author :
Hsu, Wei-Chou ; Lai, Ying-Nan ; Lee, Ching-Sung ; Yeh, Su-Wei ; Lai, Wen-Feng ; Lai, Wen-Hsuan
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
fYear :
2008
fDate :
20-23 Oct. 2008
Firstpage :
1017
Lastpage :
1020
Abstract :
In this work, approaches to improve current efficiency of white organic light-emitting diodes (WOLEDs) with high color purity have been studied. The emission layer in devices consists of 2-(t-butyl)-9,10-bis(2´-naphthyl)anthracene (TBADN) blue host and 5,6,11,12-tetraphenylnaphthacene (rubrene) yellow dopant. The efficiency can be enhanced by using architecture of dual emission layers and hole-blocking layer. However, obvious yellow-shift emission occurs due to the small energy barrier between layers. The yellow-shift phenomenon is mitigated by modifying emission layers. The highest current efficiency of WOLED is 6.43 cd/A, which is greater by 51% than the device with single emission layer. The Commission Internationale de l¿Eclairage (CIE) coordinates of (0.33, 0.33) exhibits high color purity in WOLEDs.
Keywords :
organic light emitting diodes; organic semiconductors; 2-(t-butyl)-9,10-bis(2´-naphthyl)anthracene; 5,6,11,12-tetraphenylnaphthacene yellow dopant; TBADN; WOLED; color purity; current efficiency; device emission layer; dual emission layers; dual-emission-layer design; hole-blocking layer; single emission layer; white organic light-emitting devices; yellow-shift emission; Design engineering; Energy barrier; Flat panel displays; Fluorescence; Glass; Low voltage; Microelectronics; Organic light emitting diodes; Sea measurements; Solid state lighting;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2185-5
Electronic_ISBN :
978-1-4244-2186-2
Type :
conf
DOI :
10.1109/ICSICT.2008.4734725
Filename :
4734725
Link To Document :
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