Abstract
A series of phosphor sample powders with varying concentrations of Magnesium and Barium concentration were prepared by high temperature solid state reaction method in air atmosphere. The phase formation of the calcined samples were confirmed by taking powder XRD and particle size of the sample powders were identified using SEM picture. The mechanoluminescent (ML) studies of each sample in the series were carried out via impact method. Variations in mechanoluminescence intensities were observed due to the variations in percentage compositions of magnesium and barium in the powder phosphors. The role of barium as sensitizer for enhancing ML intensities was undoubtfully proved and effort was taken to investigate about optimum concentration of barium for observing highest ML activity. The significant variations observed in ML intensities with stress variations and large decay time indicates the future scope of the sample for stress sensing applications. The Photoluminescence (PL) of the samples was studied using PL spectrum. The appreciable value of decay time and significant ML intensity variations of the sample with change in impact velocities highlights the future scope of the phosphor for stress sensing applications.
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