Graded mixed-layer OLEDs

Anna B. Chwang; Raymond C. Kwong; Julie J. Brown

doi:10.1117/12.456319

3 March 2003 Graded mixed-layer OLEDs

Anna B. Chwang, Raymond C. Kwong, Julie J. Brown

Proceedings Volume 4800, Organic Light-Emitting Materials and Devices VI; (2003) https://doi.org/10.1117/12.456319
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

We describe the performance of mixed-layer, small molecule organic light-emitting devices (OLEDs) that are step-graded from a mostly hole transporting layer (HTL) to a mostly electron transporting layer (ETL) from anode-side to cathode-side, respectively. The devices are based on a green, electrofluorescent dopant and achieve luminous efficiencies of > 4.5 lm/W and 10 cd/A. These efficiencies are significantly higher than those of a uniformly mixed device, i.e., a device in which the HTL and ETL are uniformly mixed, but lower than those of a conventional heterostructure device employing the same dopant material. Operating lifetime of the graded mixed OLEDs, however, is much improved over the heterostructure device. We then compare the performance of fluorescent OLEDs at high current drive to that of phosphorescent OLEDs at high current drive in the context of passive matrix driven display suitability.

Citation Download Citation

Anna B. Chwang, Raymond C. Kwong, and Julie J. Brown "Graded mixed-layer OLEDs", Proc. SPIE 4800, Organic Light-Emitting Materials and Devices VI, (3 March 2003); https://doi.org/10.1117/12.456319

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