Synthesis And Mechanoluminescence Characterisation of Phosphor Baal2o4: Eu, Ce.

Abstract

The mechanoluminescence (ML) of BaAl₂O₄: Eu, Ce phosphor was investigated. It was found that ML could be only produced by dynamic load. When a load is applied on to a crystal, then the mechanoluminescence (ML) emission takes place in the form of light pulse. The number of ML pulses and the time duration t_c for the appearance of ML increase with increasing value of the load and the average ML intensity from a single pulse decreases with increasing value of load For a given value of the applied pressure, the total number N_T of ML pulses, the total ML intensity I_T increases with increasing mass of the load. As the total ML intensity is directly related to the area of newly created surfaces increases with increasing value of the applied load and later on it tends to attain a saturation value for higher values of applied load. Static load, in the experimental limit, does not affect the decay process of the afterglow of the phosphor. In addition, ML can be induced by both loading and unloading process. Higher sensitivity of ML was observed at longer delay time when the load is applied after shut off the γ irradiation. Based on the results obtained, the source of ML is discussed.