Photo- and mechanoluminescent properties of the SrAl2O4 : (Eu2+, Dy3+) phosphor and its use to visualize the dynamics of material deformations

Abstract

The work investigated the deformations of materials arising from the action of high-power laser pulses. Composite mechanoluminescent materials based on a polymer and a phosphor powder were used to visualize and record the dynamics of the development of deformations. Mechanoluminescent materials were applied to the surface of the materials under study. It is shown that the spatial distribution of the glow intensity of the mechanoluminescent layer and the rate of its change make it possible to judge the magnitude and rate of deformation of materials when they are exposed to laser pulses. The kinetics and photoluminescence spectrum of composite materials were studied under the combined action of short-wave and long-wave laser radiation. It is shown that the photoluminescence excited by a long-wavelength laser is associated with the activation of the populated levels of the traps.