Device enhancement of hydroxyquinloine-based organic light-emitting diodes using a uniformly mixed electron transporting host

W. C. H. Choy; H. H. Fong; K. N. Hui; Y. J. Liang

doi:10.1117/12.618103

9 October 2005 Device enhancement of hydroxyquinloine-based organic light-emitting diodes using a uniformly mixed electron transporting host

W. C. H. Choy, H. H. Fong, K. N. Hui, Y. J. Liang

Author Affiliations +

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 593721 (2005) https://doi.org/10.1117/12.618103
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

W. C. H. Choy, H. H. Fong, K. N. Hui, and Y. J. Liang "Device enhancement of hydroxyquinloine-based organic light-emitting diodes using a uniformly mixed electron transporting host", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593721 (9 October 2005); https://doi.org/10.1117/12.618103

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