Abstract
A high-luminance and high-color-purity inorganic phosphor has been developed for the red component in ac thin-film electroluminescent devices using electron-beam evaporation. The influence of the Eu concentration on the luminescence and response characteristic of the devices was studied. A high Eu concentration causes not only concentration quenching of photoluminescence and electroluminescence (EL) emission, but also increases the light-emitting response time of the EL devices upon the application of an electric field. Decay characteristics of the thin films point out the creation of nonradiative decay channels due to the formation the clusters at high Eu concentrations. The slow light-emitting response in EL devices was attributed to the presence of traps generated by these clusters. To understand the nature of these traps, the frequency and temperature dependence of the response time was studied.
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