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Bhujbal P.M.,Commerce And Smt Mh Wegad Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Radiation Effects and Defects in Solids | Year: 2012

The lyoluminescence (LL), thermoluminescence and mechanoluminescence (ML) of a γ-ray-irradiated powder of NaCl:Dy (0.05-0.5mol%) phosphor are reported in this paper. The nature of intensity variation of the respective luminescence spectra with different γ-ray doses and with different concentrations of Dy 3+ doped in NaCl are found to be similar. The LL and ML intensities differed from each other, but their nature is found to be similar in a sublinear form up to a high dose (5.0kGy) of γ-rays. Thus, the prepared phosphor may be useful for accidental radiation dosimetry up to a high dose (5.0kGy) of γ-rays using the LL and ML techniques. © 2012 Taylor & Francis. Source


Bhujbal P.M.,Commerce And Smt Mh Wegad Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Radiation Measurements | Year: 2012

Comparative study of mechanoluminescence (ML) and the lyoluminescence (LL) of γ-irradiated coloured powder of KBr:Ce 3+ (0.1-10 mol%) phosphor is reported in this paper. Correlation between mechanoluminescence and lyoluminescence is observed, based on the formed colour centre due to γ-irradiation. All samples were prepared by a wet-chemical method. Single isolated ML and LL glow curve is observed in all samples. The variation of peak ML and LL intensities with gamma rays exposure and with different concentration of Ce 3+ doped in KBr:Ce 3+ is studied. The ML and LL intensities are found to be dependant on concentrations of Ce 3+ and gamma radiation dose. The variation of peak ML and LL intensities of KBr:Ce 3+ (0.5 mol%) with different gamma dose is found to be sublinear upto 1.5 kGy high dose and then the intensity becomes saturated. Negligible fading in the prepared sample is observed. © 2012 Elsevier Ltd. All rights reserved. Source


Bhujbal P.M.,Commerce And Smt Mh Wegad Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Upadhyay A.K.,Op Jindal Institute Of Technology | Kher R.S.,P.A. College
Journal of Luminescence | Year: 2012

The mechanoluminescence (ML) of γ-irradiated coloured powder of (KNa)Br:Ce(0.110 mol%) phosphor is reported in this paper. The samples are prepared by wet chemical method. The ML intensities are found to be dependent on concentrations of Ce 3+ ion and γ-rays radiation dose. The variation of peak ML intensity of (KNa)Br:Ce(0.5 mol%) with different γ-rays dose is found as linear up to 2.5 kGy high dose from 0.08 kGy, whereas for the KBr:Ce(0.5 mol%) and NaBr:Ce(0.5 mol%) samples the ML intensities increases sublinearly. The prepared sample shows minimum fading in ML intensity. The ML characterisation shows the good linearity, less fading and simple ML glow curve structure, thus the prepared material may be useful for radiation dosimetry. © 2012 Elsevier B.V. Source


Bhujbal P.M.,Commerce And Smt Mh Wegad Science College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Singh G.,Post University | Kher R.S.,Autonomous Government Science PG College
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

The mechanoluminescence of γ-irradiated powder of (K 0.5Na 0.5)Cl:Dy 3+ (0.05-0.5 mol%) phosphor is reported. The variation of mechanoluminescence peak intensity with γ-dose and with different concentration of Dy 3+ ions doped in (K 0.5Na 0.5)Cl are studied and compared with thermoluminescence characterization. The variation of peak mechanoluminescence intensity of (K 0.5Na 0.5)Cl:Dy 3+ (0.1 mol%) with different γ-ray dose is found to be linear up to 5 kGy exposure dose and minimum fading in peak height is observed. © 2012 Elsevier B.V. All rights reserved. Source


Raipurkar J.R.,Commerce And Smt Mh Wegad Science College | Atram R.G.,Iycollege | Muthal P.L.,Indian National Environmental Engineering Research Institute | Dhopte S.M.,Indian National Environmental Engineering Research Institute | Moharil S.V.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2013

Yb2+ emission is not reported very frequently. In several compounds it gets quenched well below room temperature. In some compounds anomalous emission related to trapped exciton levels is observed. Normal luminescence of Yb2+ in RbCaCl3 host is described here. Intense blue emission is observed. It is customary to compare f-d emission of Yb2+ with that of Eu2+ which is studied more frequently. In RbCaCl3 host, Yb2+ emission is at slightly longer wavelengths than those of Eu2+. Excitation spectra of Eu2+ are also very broad, consisting of several overlapping bands. Excitation spectra of Yb2+, in contrast, consist of four better resolved bands. The longest wavelength band is at 385 nm. This could be useful for applications such as solid state lighting. PL spectra are explained in terms of known energy level diagram for Yb2+. © 2012 Elsevier B.V. All rights reserved. Source

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