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The strongly directed spontaneous emission along the optical axis of an organic electroluminescent (EL) diode with a typical emitting material, tris(8-quinolinolato) aluminum, is realized with a planner microcavity structure. The structure of the microcavity EL diode is designed to have a resonance condition in which the total optical length is 3/2λ and the resonance wavelength λ is located at shorter wavelength side of a natural emission spectrum of a noncavity EL diode.
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Tokito et al. (1996) studied this question.