Thermally Stimulated Properties of Zinc Selenide Doped with Pr and (Ag,Pr) Phosphors

Abstract

The evaluation of trapping parameters activation energy, frequency factor, electron's life time in traps, capture cross-section, kinetics order, etc. are the most important studies in the field of themoluminescence. The thermoluminescence (TL) properties of Pr and (Ag, Pr) doped ZnSe phosphors are studied at three uniform heating rates between the temperature of 130K and 370K after excitation by UV radiation (365 nm). Trapping parameters of these phosphors have been determined and its nature is discussed.

Thermally Stimulated Luminescence in ZnSe:Ag and ZnSe:(Ag, Gd) Phosphors

“…It is found that the value of life time of electrons in traps increases with the increase in temperature. [2][3][4][5]16] It is evident that the value of the capture cross-section decreases with the increase of activation energy, this confirms the physical principle that the greater the trap depth lesser the capture probability. The kinetics analysis of glow curves was also carried out on the basis of symmetry factor (µ g ).…”

“…For any order of kinetics, the trap depth can be fairly known with sufficient accuracy using the relation [2][3][4][5]12,13]…”

“…The probability P of the electron escaping from a trap of depth E is given by the relation [1][2][3][4][5][12][13]15,17] P = S exp…”

“…For any order of kinetics, the trap depth and frequency factor can be calculated as follows [3,[5][6][7][8][9]11,12]…”

“…Evaluation of the trapping parameters such as activation energy (E), life time of electron in traps (𝜏), escape frequency factor (S), capture cross section (𝜎), and order of kinetics has also been discussed. [1][2][3][4][5][6][7][8][9][10][11]12,13,14]…”