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Article | REF: R620 V1

Display. Visualization - OLED displays

Authors: Christophe FÉRY, Philippe LE ROY

Publication date: June 10, 2005

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2. Optimization

The external quantum efficiency (η q, ext ) of a light-emitting diode is defined as the ratio of the number of photons emitted to the number of electrons injected. It can be described as the product of the electron-hole recombination rate (η r ), the radiative de-excitation probability (η dr ), the photoluminescence efficiency (φ PL ) and the fraction of photons extracted from the device (η opt ) :

ηq, ext=ηr⋅ηdr⋅ϕPL⋅ηopt

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