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Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Nagpure I.M.,University of the Free State | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Molina P.,National University of Central Buenos Aires
Journal of Materials Science | Year: 2011

UV photo-excited Eu2+ and Eu3+ luminescence from CaF2:Eu and CaF2:Eu, Bi phosphors were investigated. The effect of gamma exposure followed by temperature effect shows conversion mechanism between Eu2+ → Eu3+ ion in CaF 2:Eu and CaF2:Eu, Bi phosphors which were studied for RPL dosimetry. The photoluminescence and X-ray diffraction characterization are reported in this article. © 2011 Springer Science+Business Media, LLC. Source

Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Puppalwar S.P.,Kamla Nehru College | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Mohanty A.K.,Bhabha Atomic Research Center
Indian Journal of Pure and Applied Physics | Year: 2012

Cu + activated Li 2BPO 5 phosphor is synthesized by one step wet chemical technique and exposed to gamma-rays of 60Co source for their thermoluminescence (TL) properties. The XRD technique shows the crystalline nature of the prepared material. Photoluminescence (PL) emission spectra of Li 2BPO 5:Cu phosphor show the strong prominent peak at 368 nm in the violet region of the visible spectrum assigned to the transition of 3d 94s 1 → 3d 10 of Cu + ion. Thermoluminescence characterization of prepared Li 2BPO 5:Cu is low Z (Z eff = 10.29) phosphor shows the prominent TL glow peak at 143°C at higher temperature and intensity is 2.6 times less than that of standard TLD CaSO 4:Dy (Z eff = 15.3) phosphor, but almost 7.8 times more than that of well known LiF: Mg, Ti low Z phosphor. It may be one of the candidates for thermoluminescence dosimetry (TLD) of ionization radiations. Source

Deshmukh A.D.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya
Advanced Materials Letters | Year: 2011

The MAl12O19:Eu (M = Ca, Ba, Sr) phosphor were synthesized by combustion method and systematically characterized by photoluminescence excitation and emission spectra, concentration quenching, morphology and X-ray mapping with scanning electron microscopy. In SrAl12O19:Eu phosphor two PL emission peaks are observed at about 389 nm and another around 420 nm as well as BaAl12O19:Eu phosphor shows blue emission around 460 nm is observed in the blue region of the spectrum and CaAl12O19:Eu shows only red emission at 592 as well as 615nm. Both phosphors can be efficiently excited in the wavelength range of 250-425 nm, where the near UV (~320 nm) solid state excitation is matched. By combining MAl12O19:Eu (M = Ca, Ba, Sr) phosphor with near UV chops emitting intense blue green (Ba), yellow-red (Ca) and blue purple (Sr) LEDs white LEDs can be produced. © 2011 VBRI press. Source

Wani J.A.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Lochab S.P.,Inter University Accelerator Center | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2015

In this work a study on some thermoluminescence characteristics of Li2BaP2O7:Dy phosphor is presented. The phosphor was synthesized by solid state diffusion method and characterized for its phase purity by X-ray diffraction (XRD). FT-IR spectrum was also carried out to confirm the presence of phosphate family and vibrations corresponding to P-O-P group. Spectroscopic investigation was approached through photoluminescence (PL) and thermoluminescence (TL). PL emission spectrum of Dy3+ ions corresponding to 4F9/2 → 6H13/2 (483 nm) and 4F9/2 → 6H15/2 (574 nm) transitions is revealed under 351 nm excitation wavelength. This characteristic emission confirms the presence of Dy3+ ions in the Li2BaP2O7 host matrix. To induce TL properties in Li2BaP2O7:Dy phosphor was irradiated with C5+ ion beams and gamma rays (60Co). A nearly simple glow curve was observed for Li2BaP2O7:Dy under two different excitation sources. TL response is almost linear over a wide range. Average absorbed dose (D¯) and mean linear energy transfer (LET) of C5+ ion beams in Li2BaP2O7:Dy have also been calculated. Values of parameters like E and S known as trap depth and frequency factor respectively were obtained by using TLanal computer program. Also SRIM based calculations were performed to study the effect of C5+ ion beams on the samples of Li2BaP2O7:Dy. SRIM calculations show that Ba2+ vacancies are highest in number. Till date no such luminescence information on Li2BaP2O7:Dy phosphor is available. © 2015 Elsevier B.V. All rights reserved. Source

Wani J.A.,Rashtrasant Tukadoji Maharaj Nagpur University | Atone M.S.,Mm Science College | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2013

Effect of different rare earths co-activated in CaSO4:Dy, P phosphor prepared by acid distillation method are reported in this paper. For characterization of phosphors scanning electron microscopy (SEM), photoluminescence (PL) and thermoluminescence (TL) spectra were carried out. The SEM characterization shows that the surface morophology resulted after preparation has rod type structures with particle size in micron range. Under photoluminescence study the incorporation of different co-dopants with their characteristic photoluminescence spectra in CaSO4:Dy, P host is confirmed. Thermoluminescence (TL) property of as prepared phosphors is comparatively good though certain variations have been observed in case of some phosphors. The TL intensity of phosphors prepared and reported in this paper is nearly 1.11 times greater than the standard CaSO4:Dy TLD phosphor. © 2012 Elsevier B.V. All rights reserved. Source

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