Summary: ZnS:Dy and (ZnS:Mn,Dy) phosphors have been prepared in an inert atmosphere of pure nitrogen gas at about (950 AE 20)C. The photo luminescent (PL) and electroluminescent (EL) and spectra of these phosphors have been studied at room temperature. The purpose of this work is to know in what ways the spectraal characteristics of ZnS phosphors are affected by the introduction of Dy 3þ and Mn 2þ ions and also to determine unambiguously the electronic transitions involved in the energy transfer.
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.
Thermoluminescence studies were performed of ZnSe:Tb and ZnSe:(Mn, Tb) phosphors. A method of preparation for ZnSe phosphors doped with Tb and (Mn, Tb) has been discussed. The thermoluminescence (TL) properties of these phosphors have been studied from 100 to 370 K temperature after exciting by UV radiation (365 nm) at three uniform heating rates 0.4, 0.6 and 0.9 K/s. The trapping parameters like trap depth, lifetime of electrons and capture cross-section have also been determined using various methods.
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