The NaTi2(P04)3 crystals were synthesised and their crystal structure and luminescence properties were investigated.
Two luminescence bands in green-orange and red spectral regions have been observed. Properties ofthe red emission of
the NaTi2(P04)3 crystals were investigated. Cumulative spectral data and their analysis have allowed to assign the red
band emission to luminescence ofthe Ti3+ ions, those are formed in the NaTi2(P04)3 crystals during growth.
Presented work reports the results of luminescence investigation of thermal treatment influence on the spectral properties of sulphate crystals. The alkali sulphate polycrystalline samples, obtained after annealing and melting, reveal significant photoluminescence, that is not practically observed at the similar conditions for the respective single crystals. Besides, luminescence character depends on the thermal treatment conditions. Changes in the concentration of various type of defects in crystal matrix must be expected under annealing of sulphate crystals at the certain temperatures. Increasing of concentration of some defects creates possibility to their observation by luminescence method. We have investigated absorption, excitation, photo- and x-ray luminescence spectra of alkali sulphate single crystals and powders.
The luminescence and excitation spectra and kinetics of luminescence decay of alcaline metal and calcium chromate crystals and mixed crystals of the cesium chromate with the CaCrO4 and CaCl2 impurities were investigated. The influence of the thermal treatment temperature and impurity implantation on the luminescent properties of these luminophors has been examined. Three types of the complex centers of luminescence were found, and their spectral-kinetic characteristics such as a relative quantum efficiency, decay time of the luminescence, and conditions of formation were obtained.
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