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Nāgpur, India

Pawade V.B.,VNIET | Dhoble N.S.,Sevadal Mahila Mahavidyalaya | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Optoelectronics and Advanced Materials, Rapid Communications | Year: 2011

In this paper we reported Eu2+ luminescence in novel Ca3.5Mg0.5Si3O8Cl4 phosphors ynthesized by combustion method at 5500C furnace temperature. Phosphor was well haracterized by XRD for confirmation of phase purity and PL properties of Ca3.5Mg0.5Si3O8Cl4:Eu2+ shows emission wavelength at 494 nm corresponds to 4f65d1→4f7 transition of Eu2+ ion by keeping excitation extending broad-band from 300-400 nm centred at 345 nm. Scanning electron microscopy has been used for exploring the morphological properties of the prepared phosphors. The PL characteristics show that prepared phosphor have potential application for near UV-excited white-LEDs.

Dhoble N.S.,Sevadal Mahila Mahavidyalaya | Pawade V.B.,VNIET | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Advanced Materials Letters | Year: 2011

Eu2+ luminescence in novel Sr3.5Mg0.5Si3O8Cl4 and Ba3.5Mg0.5Si3O8Cl4 phosphors is reported in this paper. These were synthesized by combustion method at 5500C furnace temperature .The prepared phosphors shows PL emission spectra at 445 nm ,due to 4f65d1→4f7 transition of Eu2+ ions by monitoring excitation at 358 nm for Sr and Ba host lattice. Phase purity was checked by using XRD-pattern. The prepared phosphors have potential applications for solid-state lighting purpose. © 2011 VBRI press.

Shinde K.N.,Ns Science And Arts College | Pawade V.B.,VNIET | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University | Yawalkar P.W.,Nabira College
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2011

This work concerns the photoluminescence (PL) studies of intense orange emission in phosphate based phosphors doped with trivalent europium. The present compounds were prepared by combustion synthesis, and the completion of the synthesis was confirmed by X-ray diffraction (XRD) pattern. The PL emission spectrum of Eu3+ in Mg2M(PO4)2 (M = Sr and KNa) and KSrPO4 phosphors was observed at around 590 nm orange region. The spectrum is due to 5D0 → 7F1 transitions at near UV excitation, i.e., 391 nm. The 300-400 nm is Hg free excitation (Hg excitation is 85% 254 nm wavelength of light and 15% are other wavelengths), which is characteristic of solid-state lighting phosphors. Hence, intense orange PL emissions suggest the possibility of the potential of phosphate based phosphors in warm white LED phosphors. Copyright © Taylor & Francis Group, LLC.

Pawade V.B.,VNIET | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2013

Novel blue-emitting Eu2+ and Ce3+ activated Zn 0.865Mg0.730Al10.270O17 phosphors, has been synthesized by combustion methods at 550°C. The excitation spectrum shows broad-band extending from 230-400 nm, and the emission spectrum were observed at 446 nm and 431 nm, keeping excitation wavelength constant at 329 nm. XRD analysis shows the phase purity of the phosphors. Correlation in excitation bands of Eu2+ and Ce3+ were studied by Gaussian curve fitting. These characteristics makes Zn0.865Mg0.730Al 10.270O17:Eu2+,Ce3+ should be a promising blue-emitting phosphors for the production of white light in phosphor conversion white LEDs. © 2012 Elsevier B.V.

Pawade V.B.,VNIET | Dhoble N.S.,Sevadal Mahila Mahavidyalaya | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Solid State Sciences | Year: 2012

Novel Eu 2+ and Ce 3+ activated BaMg 8Al 18Si 18O 72 phosphors was prepared by combustion method and their PL characteristics were investigated. The result shows that all samples can be excited efficiently by near UV excitation under 334 nm and 316 nm. The emission was observed for BaMg 8Al 18Si 18O 72:Eu 2+ phosphor at 437 nm corresponding to d → f transition, under 334 nm broad-band excitation, whereas BaMg 8Al 18Si 18O 72:Ce 3+ phosphor shows emission band at 376 nm under 316 nm excitation. Phase purity of the phosphor was checked with the help of XRD pattern. SEM analysis shows the external morphology of the combustion synthesized phosphor. © 2011 Elsevier Masson SAS. All rights reserved.

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