Abstract
Thermal quenching of cathodoluminescence (CL) was studied by incrementally increasing the temperature of a ZnS:Ag,Cl phosphor without exposure to a continuous electron beam and measuring the decreased CL intensity. A characteristic thermal quenching temperature of 150 °C with an activation energy (Ea) of 0.87 eV was measured. In addition to the reduced CL intensity, the spectra shifted to longer wavelengths and changed shape at elevated temperature due to band gap narrowing at high temperatures and to copper contamination from the heater stage. The CL spectral distribution and intensity were 100% recoverable upon cooling back to room temperature when the electron beam exposure was <1C∕cm2.
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