External coupling efficiency in planar organic light-emitting devices

Lu, M.-H.; Sturm, J. C.
March 2001
Applied Physics Letters;3/26/2001, Vol. 78 Issue 13, p1927
Academic Journal
The external coupling efficiency in planar organic light-emitting devices is modeled based on a quantum mechanical microvavity theory and measured by examining both the far-field emission pattern and the edge emission of light trapped in the glass substrate. The external coupling efficiency is dependent upon the thickness of the indium-tin-oxide layer and the refractive index of the substrate. The coupling efficiency ranges from ∼24% to ∼52%, but in general it is much larger than the 18.9% expected from classical ray optics. © 2001 American Institute of Physics.


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