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 ?(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.

Keywords

OLEDQuantum efficiencyMaterials scienceOptoelectronicsSubstrate (aquarium)OpticsAluminiumTotal internal reflectionQuantumAperture (computer memory)PhysicsNanotechnology

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Publication Info

Year
1997
Type
article
Volume
22
Issue
6
Pages
396-396
Citations
342
Access
Closed

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G. Gu, D.Z. Garbuzov, P. E. Burrows et al. (1997). High-external-quantum-efficiency organic light-emitting devices. Optics Letters , 22 (6) , 396-396. https://doi.org/10.1364/ol.22.000396

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DOI
10.1364/ol.22.000396