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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.,RTMNU
Journal of Luminescence | Year: 2014

In this article we have reported Dy3+ luminescence in BaAl 2Si2O8 phosphors by combustion synthesis at 600 C. Phosphor shows emission bands at 484 nm and 577 nm, keeping excitation constant at 367 nm ranging from 300 to 400 nm. Till date there is no report on BaAl2Si2O8:Dy3+ phosphors. Thermoluminescent characterization was carried out to study trap depth in BaAl2Si2O8:Dy3+ phosphor. Phosphor was further characterized by XRD for the confirmation of phase purity. Therefore observed broad blue and yellow bands in Dy3+ ions show that phosphor may be applicable for white-LEDs. © 2013 Elsevier B.V.


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.


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.


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 S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Spectroscopy Letters | Year: 2013

Here we discuss the spin-orbit splitting difference in the 2F7/2 and 2F5/2 ground state of Ce3+-Activated XMg2Al16O27(XBa, Sr) phosphors. Recently we reported the optical properties in these host materials for the SSL purpose; there was no more literature available to date on these phosphor compositions. By using Gaussian curve fit analysis, we have estimated the energy level difference in the ground state of Ce3+ and the corresponding Stokes shift, and we compare these with those observed in previously reported works in different families of Ce3+-Activated oxide-based phosphors. © 2013 Copyright Taylor and Francis Group, LLC.


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.


Pawade V.B.,VNIET | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
AIP Conference Proceedings | Year: 2011

Here, we reported the PL characteristics of Ca 3Al 2O 5Cl 2:Eu 3+ phosphor by combustion method at the constant furnace temperature 550°c. Phosphor gives emission band shoulder at 581 nm, 589 nm, 596 nm, 616 nm, 621 nm respectively monitoring 252 nm mercury excitation. It was further characterized by XRD, for confirmation of phase purity. SEM analysis was carried out to show external morphology of the phosphor. The prepared phosphor shows potential application as red phosphor for lamp industries. © 2011 American Institute of Physics.


Pawade V.B.,VNIET | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Luminescence | Year: 2011

Eu 2+-activated SrMg 2Al 16O 27 novel phosphor was synthesized by a combustion method (550°C furnace). The prepared phosphor was first characterized by X-ray diffraction (XRD) for confirmation of phase purity. SEM analysis showed the morphology of the phosphor. The photoluminescence characteristics showed broad-band excitation at 324 nm, which was monitored at 465 nm emission wavelength. The SrMg 2Al 16O 27:Eu 2+ phosphor shows broad blue emission centred at 465 nm, emitting a blue light corresponding to 4f 65d 1 → 4f 7 transition. Here we report the photoluminescence characteristics of the prepared phosphor and compare it with commercial BAM:Eu 2+ phosphor. Copyright © 2011 John Wiley & Sons, Ltd.


Pawade V.B.,VNIET | Dhoble N.S.,Sevadal Mahila Mahavidyalaya | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2012

In this article, we have reported emission characteristics of Eu 2+ activated Sr 12Al 10.6Si 3.4O 32Cl 5.4 and Ca 12Al 10.6Si 3.4O 32Cl 5.4 phosphors, prepared by combustion synthesis. The PL excitation was monitored at two different wavelengths 254 nm (mercury excitation) and 354 nm (mercury free excitation), which shows broad-blue emission bands at 432 nm, and 438 nm for 354 nm excitation wavelength. Under mercury excitation at 254 nm it shows emission wavelengths at 470 nm, 589 nm, 592 nm, and 617 nm for the prepared Sr 12Al 10.6Si 3.4O 32Cl 5.4 and Ca 12Al 10.6Si 3.4O 32Cl 5.4 phosphors. Further it was characterized by XRD, for the investigation of phase and purity of the phosphors. Thermal degradation of the phosphors was also studied at different temperatures. © 2012 Elsevier B.V. All rights reserved.

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