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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.


Baig N.,Janta Mahavidhyalaya | Dhoble N.S.,Sevadal Mahila Mahavidyalaya | Pawade V.B.,VNIET | Kokode N.S.,Gondwana University | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2014

In this article we report Eu3+ luminescence in novel K3Ca2(SO4)3Cl phosphors prepared by wet chemical methods. The Eu3+ emission was observed at 594 nm and 615 nm, keeping the excitation wavelength constant at 396 nm nearer to light-emitting diode excitation, Furthermore, phosphors were characterized by X-ray diffraction for the confirmation of crystallinity. The variation of the photoluminescence intensity with impurity concentration has also been discussed. Thus, prominent emission in the red region makes prepared phosphors more applicable for white light-emitting diodes. Copyright © 2013 John Wiley & Sons, Ltd.


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.


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.

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