Laser-excited transition probabilities and oscillator strengths of calcium sulphide doped phosphors

Abstract

Pulse excitation method has been used to find out the transition probabilities and oscillator strengths of calcium sulphide phosphors, doped with different activators having variable concentrations using ultraviolet laser as the excitation source. These investigations have been carried out at room temperature and at liquid nitrogen temperature. Various strong transitions in these phosphors have been detected and the corresponding oscillator strengths for these transitions have been calculated in terms of emission wavelengths, index of refraction and the transition probability at room temperature and liquid nitrogen temperature. The effect of concentration of the various dopants and the effect of temperature on transition probability and oscillator strength is also studied.