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Proceedings Paper

High-efficiency organic electrophosphorescent devices
Author(s): Mark E. Thompson; Sergey Lamansky; Peter Djurovich; Drew Murphy; Feras Abdel-Razaq; Stephen R. Forrest; Marc A. Baldo; Paul E. Burrows; Chihaya Adachi; Theodore X. Zhou; Lech A. Michalski; Kamala Rajan; Julie J. Brown
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Paper Abstract

We have fabricated saturated red, orange, yellow and green OLEDs, utilizing phosphorescent dopants. Using phosphorescence based emitters we have eliminated the inherent 25% upper limit on emission observed for traditional fluorescence based systems. The quantum efficiencies of these devices are quite good, with measured external efficiencies > 15% and > 40 lum/W (green) in the best devices. The phosphorescent dopants in these devices are heavy metal containing molecules (i.e. Pt, and Ir), prepared as both metalloporphyrins and organometallic complexes. The high level of spin orbit coupling in these metal complexes gives efficient emission from triplet states. In addition to emission from the heavy metal dopant, it is possible to transfer the exciton energy to a fluorescent dye, by Forster energy transfer. The heavy metal dopant in this case acts as a sensitizer, utilizing both singlet and triplet excitons to efficiently pump a fluorescent dye. We discuss the important parameters in designing electrophosphorescent OLEDs as well as their strengths and limitations. Accelerated aging studies, on packaged devices, have shown that phosphorescence based OLEDs can have very long device lifetimes.

Paper Details

Date Published: 2 February 2001
PDF: 6 pages
Proc. SPIE 4105, Organic Light-Emitting Materials and Devices IV, (2 February 2001); doi: 10.1117/12.416884
Show Author Affiliations
Mark E. Thompson, Univ. of Southern California (United States)
Sergey Lamansky, Univ. of Southern California (United States)
Peter Djurovich, Univ. of Southern California (United States)
Drew Murphy, Univ. of Southern California (United States)
Feras Abdel-Razaq, Univ. of Southern California (United States)
Stephen R. Forrest, Princeton Univ. (United States)
Marc A. Baldo, Princeton Univ. (United States)
Paul E. Burrows, Princeton Univ. (United States)
Chihaya Adachi, Princeton Univ. (United States)
Theodore X. Zhou, Universal Display Corp. (United States)
Lech A. Michalski, Universal Display Corp. (United States)
Kamala Rajan, Universal Display Corp. (United States)
Julie J. Brown, Universal Display Corp. (United States)

Published in SPIE Proceedings Vol. 4105:
Organic Light-Emitting Materials and Devices IV
Zakya H. Kafafi, Editor(s)

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