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

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

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 ?(e), consistent...

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Veröffentlicht in:Optics letters 1997-03, Vol.22 (6), p.396-398
Hauptverfasser: Gu, G, Garbuzov, D Z, Burrows, P E, Venkatesh, S, Forrest, S R, Thompson, M E
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container_end_page 398
container_issue 6
container_start_page 396
container_title Optics letters
container_volume 22
creator Gu, G
Garbuzov, D Z
Burrows, P E
Venkatesh, S
Forrest, S R
Thompson, M E
description 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 ?(e), consistent with measurements. We demonstrate a shaped substrate that increases ?(e) 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 ?(e) 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.
doi_str_mv 10.1364/ol.22.000396
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