Low temperature photoluminescence and deformation luminescence of microparticles SrAl2O4:( Eu2+, Dy3+) in a matrix of photopolymer

The paper deals with low-temperature photoluminescence and deformation luminescence (mechanoluminescence) of a composite material based on fine disperse powder of phosphor SrAl2O4:( Eu2+, Dy3+) and photopolymerizing resin that is transparent in the visible region. New information about the energy levels of impurities and defects was obtained. It has been found that at low temperatures (T = 15 divided by 200 K) the photoluminescence spectrum of SrAl2O4:(Eu2+, Dy3+) presents two partially overlapping wide bands with the maxima at lambda(1 max) = 446 nm and lambda(2 max) = 517 nm. The strong interaction of energy states of the bands results in temperature quenching of the short-wave band of luminescence (lambda(1 max) = 446 nm) and its complete attenuation at T >= 200 K. The results were used to describe the mechanism of persistent luminescence and mechanoluminescence of SrAl2O4:(Eu2+, Dy3+).