Thermoluminescence Induced by A. C. Electric Field In Electroluminescent ZnS(Cu) Single Crystals

摘要

Experiments have been performed on the Thermoluminescence (TL) due to Electroluminescent (EL) excitation of ZnS(Cu) single crystals. Two major glow peaks are found respectively at 35 and 100K, the first being characteristic of EL excitation. The measured activation energies of these glow peaks turn out to be 0.00361 eV and 0.0931 eV and the kinetics order approximately 0.5 and 1. The integrated light intensity of the first glow peak overcomes that of a single EL brightness wave at the same voltage by a factor of about 10,000. With reference to the EL model previously put forward by us these experimental results can be accounted for satisfactorily. The first peak in fact appears due to electrons trapped at the broken bonds lying along the EL defect and the second peak is produced by electrons scattered during the direct bias injection and successively trapped in the bulk ZnS. (Author)