Gondwana University

Gadchiroli, India

Gondwana University

Gadchiroli, India
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Panse V.R.,Sant Gadge Baba Amravati University | Yerpude A.N.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Kokode N.S.,Gondwana University | Choithrani R.,Barkatullah University
Journal of Materials Science: Materials in Electronics | Year: 2017

Here we used combustion synthesis method for preparation of CaSr2Al2O6 with different rare earth ion such as Tb3+ and Eu3+ ions for the production of white light emission. The entire rare earth ion shows effective luminescence efficiency in aluminate based compounds. Further, prepared phosphor was analyzed by XRD, SEM, FTIR, and CIE with photoluminescence measurment in addition with effect of emission intensity with relative concentration of each activator. In case of Tb3+ activator, we observed the emission intensity at 545 nm for the excitation 380 nm, obtaining prominent green emission while in case of Eu3+ activator concentration quenching occure and obtained emission at 616 nm for excitation 396 nm which could be useful for solid state lighting application. The chromaticity coordinates were observed at for Tb 3+ at 545 nm is (Cx = 0.265, Cy = 0.723) and Eu3+ at 616 nm is (Cx = 0.652, Cy = 0.316). © 2017 Springer Science+Business Media, LLC


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.


Panse V.R.,Gondwana University | Panse S.V.,Nhcollege | Dhoble N.S.,Sevadal Mahila Mahavidyalay | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Materials Science: Materials in Electronics | Year: 2016

To understand the mechanism of excitation and the corresponding emission of prepared phosphor for solid state lighting here we discuss here the luminescence properties of Tb3+ and Eu3+ doped SrMg2Al16O27 phosphor for solid state lighting. In this work Tb3+ and Eu3+ ion is used as a dopant, and in case of Tb3+ the excitation and emission spectra indicate that this phosphor can be effectively excited by 353 nm, to exhibit bright green emission cantered at 545 nm corresponding to the f → f transition of Tb3+ ions while in case of Eu3+ phosphor can be efficiently excited by 396 and observed the emission at 597 nm and 614 nm in addition with analysis of chromaticity coordinates. All the characteristics indicated that SrMg2Al16O27:Tb3+ and Eu3+ is a good candidate for solid state lighting industry applications. © 2016 Springer Science+Business Media New York


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.


Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Advanced Materials Letters | Year: 2015

In present work we studied the luminescence properties of Tb3+ and Mn2+ doped Ca2PO4Cl phosphor synthesized by wet chemical method were studied with extra heat treatment, to understand the mechanism of excitation and the corresponding emission of prepared phosphor. For the green emission, Tb3+ ion is used as an activator, the excitation and emission spectra indicate that this phosphor can be effectively excited by 380 nm, to exhibit bright green emission centered at 545 nm corresponding to the f→f transition of Tb3+ ions. The emission spectrum of Mn2+ ion at 405 nm excitation 4T1(4G)-6A1(6S) gives an emission band at 591 nm (orange-red). The observed photoluminescence (PL) measurements of Tb3+ and Mn2+ activated prepared phosphor indicates that these are the outstanding green and orange-red emitting potential phosphor ,suitable application for the solid state lighting. The synthesized phosphors were analyzed by X-ray diffraction (XRD) for confirmation of phase and purity. The morphology and structure were characterized by scanning electron microscopy. Thus the phosphors in this system may be chosen as the green component for the tri-color lamp and certainly applied in w-UVLEDs. In the view of the excitation band and excellent luminescent properties, Ca2PO4Cl:Tb3+ and Mn2+ phosphor is expected to be a potential candidate for application in n-UV white LEDs and solid state lighting because of its cost efficient manufacturing, mercury free excitation and eco-friendly characteristics. © 2015 VBRI Press.


Panse V.R.,Rashtrasant Tukadoji Maharaj Nagpur University | Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Advanced Materials Letters | Year: 2014

In this paper we present luminescence results on Tb3+ doped Sr2(BO3)Cl green phosphor. The vibrational properties of Sr2(BO3)Cl phosphor was studied by Fourier transform infrared spectroscopy. Photoluminescence studies have been carried out to understand the mechanism of excitation and the corresponding emission in the as prepared phosphor. As the Tb3+ ion is commonly used as an activator for the green emission, the excitation and emission spectra indicate that this phosphor can be effectively excited by 380 nm, to exhibit bright green emission centered at 546 nm corresponding to the f→f transition of Tb3+ ions. © 2014 VBRI press.


Panse V.R.,Rashtrasant Tukadoji Maharaj Nagpur University | Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Optik | Year: 2015

The purpose of the present study is to develop an understanding of photoluminescence properties of Tb3+ activated ZrO2 green emitting phosphor which have served as efficient promising phosphor for solid state lighting. The phase formation, structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The photoluminescence properties were measured using Shimadzu RF 5301 at room temperature. Photoluminescence excitation spectrum measurements of ZrO2:Tb3+ show this phosphor may be efficiently excited by the UV-vis light region 300-400 nm, i.e. 379 nm and it exhibited strong green emission (545 nm) emission corresponding to 5D4-7F5 transition of Tb3+. The incorporation of Tb3+ ions into ZrO2 lattice could induce a remarkable increase of photoluminescence intensity so the dependence of the emission intensity on the Tb3+ concentration for the host was also been studied. CIE chromaticity coordinates determined with the help of emission spectra of the prepared phosphor. TL glow curve can be analyzed for the determination of trapping parameter such as activation energy, order of kinetics and frequency factor. The strong and color-uniform fluorescence images of the Tb3+ activated samples confirmed the potential applications of the phosphors in solid state lighting. © 2015 Elsevier GmbH. All rights reserved.


Panse V.R.,Rashtrasant Tukadoji Maharaj Nagpur University | Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Optik | Year: 2015

The purpose of the present study is to develop an understanding of photoluminescence properties of Tb3+ activated ZrO2 green emitting phosphor which have served as efficient promising phosphor for solid state lighting. The phase formation, structure and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The photoluminescence properties were measured using Shimadzu RF 5301 at room temperature. Photoluminescence excitation spectrum measurements of ZrO2:Tb3+ show this phosphor may be efficiently excited by the UV-vis light region 300-400nm, i.e. 379nm and it exhibited strong green emission (545nm) emission corresponding to 5D4-7F5 transition of Tb3+. The incorporation of Tb3+ ions into ZrO2 lattice could induce a remarkable increase of photoluminescence intensity so the dependence of the emission intensity on the Tb3+ concentration for the host was also been studied. CIE chromaticity coordinates determined with the help of emission spectra of the prepared phosphor. TL glow curve can be analyzed for the determination of trapping parameter such as activation energy, order of kinetics and frequency factor. The strong and color-uniform fluorescence images of the Tb3+ activated samples confirmed the potential applications of the phosphors in solid state lighting. © 2015 Elsevier GmbH.


Panse V.R.,Gondwana University | Kokode N.S.,Nh College | Yerpude A.N.,Nh College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Optik | Year: 2016

Terbium doped Sr2B2O5 green phosphor was synthesized by combustion synthesis method at about 550 °C. Further, analyzed by XRD technique and XRD pattern of prepared phosphor is well match with standard JCPDs file. The morphology and structure of the phosphor were characterized by scanning electron microscopy. The chromatic coordinates estimated from emission spectra shown by CIE chromatic diagram and values observed are Cx = 0.263, Cy = 0.723. The vibrational characteristics were studied with the help of FTIR. The excitation and emission spectra specify that the prepared phosphor can be effectively excited by 353 nm and reveal bright green emission centered at 545 nm consequent to the D → F transition of Tb3+ ion. From the obtained results it is concluded that present phosphor may be efficient photoluminescent materials for solid-state lighting and energy saving applications. © 2015 Elsevier GmbH.


PubMed | NCET, Rashtrasant Tukadoji Maharaj Nagpur University, Gondwana University and N H College
Type: Journal Article | Journal: Luminescence : the journal of biological and chemical luminescence | Year: 2016

In this work, we studied the luminescence properties of Tb(3+)-doped MgPbAl10O17 green phosphor. To understand the excitation mechanism and corresponding emission of the prepared phosphor, its structural, morphological and photoluminescence properties were investigated. In general, for green emission, Tb(3) is used as an activator and the obtained excitation and emission spectra indicated that this phosphor can be effectively excited by a wavelength of 380 nm, and exhibits bright green emission centered at 545 nm corresponding to the f f transition of trivalent terbium ions. The chromaticity coordinates were (C(x) = 0.263, C(y) = 0.723). The impact of Tb(3+) concentration on the relative emission intensity was investigated, and the best doping concentration was found to be 2 mol%. This study suggests that Tb(3+)-doped MgPbAl10O17 phosphor is a strong candidate for a green component in phosphor-converted white light-emitting diodes.

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