Влияние температуры на люминесцентные свойства керамики MgAl-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- : Dy, синтезированной методом искрового плазменного спекания

MgAl2O4:Dy3+ transparent ceramics were synthesized by Spark Plasma Sintering technique. The optical properties, photo- and cathodoluminescence, and luminescence decay kinetics were studied. The effect of temperature on the spectral and kinetic characteristics of luminescence was investigated. There are several emission bands in emission spectra responsible for Dy3+ ions at 458 (4I15/2 - 5H15/2), 480 nm (4F9/2 - 6H15/2), 573 nm (4F9/2 - 6H13/2), 665 nm (4F9/2 - 6H11/2), 750 nm (4F9/2 - 6H9/2), chromium Cr3+ (2Eg - 4A2g), and internal defects such as F+ centers (460 nm) were observed. The temperature quenching of the luminescence in the visible spectral range is observed when the temperature varies from 100 to 300 K. It is shown that in the MgAl2O4: Dy ceramics, the quenching patterns for impurity and intrinsic centers differ. The mechanisms of temperature quenching are discussed.