Sevadal Mahila Mahavidhyalaya

Nāgpur, India

Sevadal Mahila Mahavidhyalaya

Nāgpur, India

Time filter

Source Type

Wani J.A.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Advanced Materials Letters | Year: 2014

As host materials, phosphate compounds offer great potential for lanthanides to display luminescence characteristics. In this work luminescence behaviour of Na2CaP2O7:RE3+ are presented for the first time. Na2CaP2O7 novel phosphors activated with the trivalent rare earth ions ((RE = Ce, Eu, Tb, Sm) were synthesized by solid state diffusion method. Phosphors were characterized for phase purity and luminescent properties. The emission and excitation spectra were followed to explore the luminescence attributes. The as prepared powders of Ce3+, Eu3+,Tb3+ and Sm3+ doped Na2CaP2O7 emit near-uv, red, green and orange reddish light as result of f-d and f-f transitions respectively. The study is novel as no such luminescence data are available for this compound. The results are promising in view of the requirement for pc-white LEDs for solid state lighting applications. © 2014 VBRI press.


Wani J.A.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Kokode N.S.,Gondwana University | Deva Prasad Raju B.,Sri Venkateswara University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2014

Phosphate compounds as host materials are always a good choice for lanthanides to exhibit luminescence. The novel phosphors of Li 2BaP2O7 activated with the trivalent Eu 3+ and Sm3+ ions were synthesized by high temperature solid state reaction. In characterization, crystallization, morphology and luminescent properties of lithium barium diphosphate were investigated. The excitation and emission spectra were recorded to study the luminescence properties. The as prepared powders of Eu3+ and Sm3+ ions doped Li2BaP2O7 emit reddish orange light, corresponding to 5D0→7F1(595 nm) and 4G5/2→6H7/2(599 nm) transitions, respectively. The study is novel as no such luminescence data are available for this compound. © 2013 Elsevier Ltd. All rights reserved.


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.


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.


Oza A.H.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | 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

This paper investigates luminescence properties of Sr2B5O9Cl:Eu phosphor prepared by modified solid state diffusion. The influence of Phosphorous ion as codopant is also explained in detail. The structural confirmation of the sample was done using the XRD technique. SEM revealed the microcrystalline nature of the prepared phosphor. The characteristic Eu2+ emission at 437 nm and 423 nm was observed for Sr2B5O9Cl:Eu and Sr2B5O9Cl:P,Eu, respectively under 338 nm excitation. Samples in powder form were irradiated with different doses under γ-ray irradiation with 60Co source and the TL glow curves for both Sr2B5O9Cl:Eu and Sr2B5O9Cl:P,Eu samples were studied. In case of Sr2B5O9Cl:Eu phosphor, single glow curve nature centered on 260 °C with a shoulder peak around 144 °C was observed. However; Sr2B5O9Cl:P,Eu have shown slight different and broad glow curve nature. The TL sensitivity in both the cases was compared with CaSO4:Dy phosphor. Sr2B5O9Cl:Eu sample have shown 1.17 times less sensitivity than CaSO4:Dy and for Sr2B5O9Cl:P,Eu it was found to be equal to CaSO4:Dy and Sr2B5O9Cl:P,Eu is 1.21 times more sensitive than Sr2B5O9Cl:Eu. Other TL properties like dose response, fading and reusability were studied for both the samples. The trapping parameters for both the samples were calculated using computerized glow curve deconvolution and reported in this paper. © 2014 Elsevier B.V.


Puppalwar S.P.,Kamla Nehru College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Kumar A.,Indian National Environmental Engineering Research Institute
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2012

Li 2NaBF 6 doped with Cu and co-doped with P are synthesized by wet chemical technique and exposed to gamma-rays of 60Co for their thermoluminescence (TL) properties. The XRD technique shows the crystalline nature of the prepared material. The induced TL glow curves of Cu doped sample are found to be at 118 °C with a single peak. Li 2NaBF 6: Cu is low Z material (Z eff = 8.96) and observed 4.3 times more sensitive than LiF: Mg, Ti (TLD-100). A linear TL response is observed in Li 2NaBF 6: Cu in a long span of exposures. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (γ) associated with the most intensive glow peak, i.e. the 118 °C glow peak of Li 2NaBF 6: Cu phosphor were determined by using glow curve shape (Chen's) method and these parameters are in good agreement. Photoluminescence (PL) emission spectra of Li 2NaBF 6: Cu phosphor shows the strong prominent peak at 368 nm in the violet region of the visible spectrum due to the transition of 3d 94s 1↔ 3d 10 of Cu + ion. The increase in photoluminescence of Li 2NaBF 6: Cu by co-doping with P has been studied. © 2011 Elsevier B.V. All rights reserved.


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.


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.


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.


Madhukar Reddy C.,AP Model School | Deva Prasad Raju B.,Sri Venkateswara University | John Sushma N.,Sri Padmavathi Mahila University | Dhoble N.S.,Sevadal Mahila Mahavidhyalaya | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Renewable and Sustainable Energy Reviews | Year: 2015

Trivalent rare earth ions show interesting optical properties and such properties have high technological applications of rare earth doped materials such as energy saving lighting devices, optical displays, optical fibers, amplifiers and lasers. Among these materials rare earth ions doped glasses are of great important to optoelectronics and are widely used in fiber amplifiers and solid state high power lasers for telecommunications and light emitting diodes. Near-infrared luminescence for high power lasers is a current requirement in modern fiber optic telecommunication network and emphasis has to put in recent advances of NIR emitting materials for amplifiers, fiber lasers and waveguides. We make an effort to satisfy the above needs by preparing the LCZSFB glasses doped with Sm3+, Dy3+, Eu3+, Tb3+ and Nd3+ rare earth ions. In this review, optical properties of LCZSFB glasses doped with Sm3+, Dy3+, Eu3+, Tb3+ and Nd3+ rare earth ions and the current status of their applications is given. © 2015 Elsevier Ltd.

Loading Sevadal Mahila Mahavidhyalaya collaborators
Loading Sevadal Mahila Mahavidhyalaya collaborators