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Proceedings Paper

Device enhancement of hydroxyquinloine-based organic light-emitting diodes using a uniformly mixed electron transporting host
Author(s): W. C. H. Choy; H. H. Fong; K. N. Hui; Y. J. Liang
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Paper Abstract

By engineering a new cohosting system of tris(8-hydroxyquinoline) and 4,7-diphenyl-1,10-phenanthroline in the electron transport layer, the current efficiency of the organic light emitting diode is improved by more than 20% while the bias is reduced by ~40% as compared to the device with a single host of Alq3 as the electron transport layer. The maximum luminance is over 16000 cd/m2 at the bias of 22V and the current of 475mA/cm2, which is ~73% higher than the single host Alq3 device without optimizing the layer thickness. The lifetime under ambient environment is enhanced by a factor of ~1.8. The reasons for the improvement will be investigated. The results strongly indicate that the knowledge of bulk conductivity engineering of organic n-type transporters shows practical significance in OLED applications.

Paper Details

Date Published: 9 October 2005
PDF: 9 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593721 (9 October 2005); doi: 10.1117/12.618103
Show Author Affiliations
W. C. H. Choy, Univ. of Hong Kong (Hong Kong China)
H. H. Fong, Univ. of Hong Kong (Hong Kong China)
Cornell Univ. (United States)
K. N. Hui, Univ. of Hong Kong (Hong Kong China)
Y. J. Liang, Univ. of Hong Kong (Hong Kong China)

Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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