Electroluminescence Studies in Pyrene Single Crystals

Abstract

Abstract The observation of electroluminescence in pyrene single crystals is reported. Holes and electrons were introduced into the samples by contact injection using CuI and Na-Hg amalgam electrodes as hole and electron injectors, respectively. The radiation-recombination light intensity is found to be directly proportional to the current through the crystal. The yield for light emission is about 2 × 10−3 photons per injected electron-hole pair. The electroluminescence spectrum differs from the fluorescence spectrum of pyrene (excimer emission) by the appearance of fine structure, the relative heights of the various peaks being functions of the injecting current.