dc and Pulsed Electroluminescence in Anthracene and Doped Anthracene Crystals

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Abstract
The current–voltage characteristics of anthracene crystals have been studied under dc and pulsed conditions in the temperature range 350–100°K. The crystals are provided with contact combinations consisting of an electron injecting contact together with either a hole injecting contact or an individually blocking contact. Intense electroluminescence is observed from all contact combinations, and at high crystal currents, ∼ 10−6 A cm−2, each combination shows similar steady‐state characteristics. Pulsed measurements illustrate that different mechanisms for hole injection are involved, at high and low current densities, and a possible mechanism for enhanced hole injection under high electron current densities is discussed. The spectral distribution of the electroluminescence is found to be independent of contact material, but does depend upon crystal preparation.