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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 22, Iss. 6 — Mar. 15, 1997
  • pp: 396–398

High-external-quantum-efficiency organic light-emitting devices

G. Gu, D. Z. Garbuzov, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson  »View Author Affiliations


Optics Letters, Vol. 22, Issue 6, pp. 396-398 (1997)
http://dx.doi.org/10.1364/OL.22.000396


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Abstract

We study the internal and external quantum efficiencies of vacuum-deposited organic light-emitting devices (OLED’s). The internal quantum efficiency of OLED’s based on tris-(8-hydroxyquinoline) aluminum is calculated to be 5.7 times the observed external quantum efficiency ƞe, consistent with measurements. We demonstrate a shaped substrate that increases ƞe by a factor of 1.9±0.2 over similar OLED’s fabricated upon flat glass substrates and leads to a 100%-emissive aperture, i.e., the emitting area completely occupies the display area even in the presence of metal interconnects. We also discuss a substrate structure that increases ƞe by an additional factor of 2. The high device efficiencies are promising for developing OLED-based displays with extremely low power consumption and increased operational lifetime.

© 1997 Optical Society of America

Citation
G. Gu, D. Z. Garbuzov, P. E. Burrows, S. Venkatesh, S. R. Forrest, and M. E. Thompson, "High-external-quantum-efficiency organic light-emitting devices," Opt. Lett. 22, 396-398 (1997)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-22-6-396

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