Thermoluminescence studies of CaS : Bi nanocrystalline phosphors

Abstract

The thermoluminescence (TL) studies of CaS : Bi nanocrystalline phosphors prepared by the wet chemical co-precipitation method and exposed to γ-rays have been discussed. The average grain size of the samples was estimated as 35 nm using Scherrer's equation. The samples exhibit a complex TL glow curve with multiple peaks. Sample exposed to γ-rays showed that the TL intensity increases linearly as the radiation doses increased in the 1.012–40.48 mGy range. The trap parameters namely, activation energy (E), order of kinetics (b) and frequency factor (s) of the main peaks of the CaS : Bi(0.08 mole%) sample have been determined using Chen's method. The effect of different dopant concentrations and different heating rates has also been discussed.

Thermoluminescence response and trap parameters determination of gamma exposed Ce doped SrS nanostructures

“…It is known that TL response of any material is different for different ionizing radiations or ions [10][11], so it is important to know about the nature of these centres or traps. Therefore, in continuation to our previous work, this report aims at the systematic thermoluminescence study of the cerium doped SrS nanostructures exposed to Co-60 gamma rays at room temperature.…”

Thermoluminescence characteristics of gamma irradiated CaS:Ce nanophosphors

“…Being a wide bandgap (4.43 eV) [7] semiconductor, it is investigated with wide range of dopants such as Sm 3+ , Ce 3+ , Eu 2+ , Bi 3+ , etc. [11][12][13][14]. These days nanotechnology has stimulated interest in the properties of nano form of the matter.…”

Thermoluminescence study of UV irradiated Ce doped SrS nanostructures

“…sensors, optical memory devices, scintillators and radiation dosimetry [2,[10][11][12][13]. Kumar et al [8,14] have investigated the thermoluminescence properties of CaS:Bi nanophosphors exposed to UV and gamma radiations. Kojima et al [15] have recently reported the effect of strontium and lithium ions on afterglow time of red emitting CaS:Eu, Pr phosphor upon visible light irradiation.…”