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Proceedings Paper

Graded mixed-layer OLEDs
Author(s): Anna B. Chwang; Raymond C. Kwong; Julie J. Brown
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Paper 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.

Paper Details

Date Published: 3 March 2003
PDF: 7 pages
Proc. SPIE 4800, Organic Light-Emitting Materials and Devices VI, (3 March 2003); doi: 10.1117/12.456319
Show Author Affiliations
Anna B. Chwang, Universal Display Corporation (United States)
Raymond C. Kwong, Universal Display Corporation (United States)
Julie J. Brown, Universal Display Corporation (United States)

Published in SPIE Proceedings Vol. 4800:
Organic Light-Emitting Materials and Devices VI
Zakya H. Kafafi; Homer Antoniadis, Editor(s)

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