Kamlesh Vasantrao Dabre
@taywadecollege.edu.in
Assistant Professor, Physics
Taywade College, Mahadula-Koradi, Dist. Nagpur, MS, India
EDUCATION
M.Sc., Ph.D. (Physics)
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Amruta Gaikwad, Yatish R. Parauha, K.V. Dabre, and S.J. Dhoble
Elsevier BV
Prashant N. Parale, Abhijeet R. Kadam, S. J. Dhoble, and K. V. Dabre
Royal Society of Chemistry (RSC)
The studied phosphor LiAl(PO3)4: x mol% Tb3+, y mol% Eu3+, z mol% R+ (R = Na, K) shows excellent photoluminescence properties with efficient energy transfer from Tb3+ to Eu3+, enhancement in intensity using charge compensation and show the photochromic nature.
Prashant N. Parale, Abhijeet R. Kadam, K.V. Dabre, and S.J. Dhoble
Elsevier BV
Amruta Gaikwad, Yatish R. Parauha, S. J. Dhoble, and K. V. Dabre
Springer Science and Business Media LLC
Prashant N. Parale, Abhijeet R. Kadam, K.V. Dabre, and S.J. Dhoble
Elsevier BV
C.M. Mehare, A.S. Nakhate, S.J. Dhoble, and K.V. Dabre
Elsevier
K. V. Dabre, J. Wani, S. Dhoble, S. P. Lochab and A. Nakhate
Herein, the photoluminescence (PL) and thermoluminescence (TL) properties of rare earth doped cubic double perovskite tungstate Ba2(1−x)(Na,RE)xZnWO6 (RE = Ce3+, Eu3+ and Dy3+) phosphors synthesized by the solid‐state reaction method are presented. The self‐luminescence of pure Ba2ZnWO6 material in the blue‐green region is enhanced by Ce3+ doping with its most effective concentration of 3 mol%. The dominant emission in orange (of Eu3+ at 597 nm) and blue (of Dy3+ at 485 nm) region in the emission spectra of Ba2(1−x)(Na,Eu)xZnWO6 and Ba2(1−x)(Na,Dy)xZnWO6 phosphor, respectively, shows highest intensity for 3 mol% of Eu3+ and 2 mol% of Dy3+ ion in the host lattice. The broad excitation band of Ce3+ and Dy3+ doped phosphor in the near UV region claims its candidature for solid‐state lighting. TL studies are also performed using γ‐radiation. Pure host material shows a simple glow curve while the rare earth ion doped phosphor shows a complex glow curve with enhanced intensity. Phosphor shows the fairly linear response up to 1 kGy radiation. Glow curves are deconvoluted and the trap parameters are calculated by Chen's peak shape method.
Javaid A. Wani, Bhushan P. Kore, K.V. Dabre, S.J. Dhoble, and Vibha Chopra
Elsevier BV
Vijay Singh, K.V. Dabre, S.J. Dhoble, and G. Lakshminarayana
Elsevier BV
V. B. Pawade, R. P. Birmod, Aishwarya Waghmare, K. V. Dabre and S. Dhoble
M. Yawalkar, G. D. Zade, K. V. Dabre and S. Dhoble
In this study, Li6 Y1-x Eux (BO3 )3 phosphor was successfully synthesized using a modified solid-state diffusion method. The Eu(3+) ion concentration was varied at 0.05, 0.1, 0.2, 0.5 and 1 mol%. The phosphor was characterized for phase purity, morphology, luminescent properties and molecular transmission at room temperature. The XRD pattern suggests a result closely matching the standard JCPDS file (#80-0843). The emission and excitation spectra were followed to discover the luminescence traits. The excitation spectra indicate that the current phosphor can be efficiently excited at 395 nm and at 466 nm (blue light) to give emission at 595 and 614 nm due to the (5) D0 → (7) Fj transition of Eu(3+) ions. Concentration quenching was observed at 0.5 mol% Eu(3+) in the Li6 Y1-x Eux (BO3 )3 host lattice. Strong red emission with CIE chromaticity coordinates of phosphor is x = 0.63 and y = 0.36 achieved with dominant red emission at 614 nm the (5) D0 → (7) F2 electric dipole transition of Eu(3+) ions. The novel Li6 Y1-x Eux (BO3 )3 phosphor may be a suitable red-emitting component for solid-state lighting using double-excited wavelengths, i.e. near-UV at 395 nm and blue light at 466 nm. Copyright © 2015 John Wiley & Sons, Ltd.
K. V. Dabre and S. Dhoble
In the present work, rare earth (Eu3+, Dy3+ and Sm3+) activated Ca4Al6WO16 phosphors were synthesized by citrate complexation and combustion methods and their photoluminescence characterization was performed. The phase purity and morphology of the phosphors were characterized by XRD and SEM. The SEM micrographs of phosphor sample synthesized by citrate complexation method show a layer structure while sample synthesized by citrate combustion method show porous nature. Intense red emission of Eu3+ and yellow emission of Dy3+ in Ca4Al6WO16 host lattice show the occupation of a noncentrosymmetric site by the rare earth ions in the host lattice. The reddish orange emission from Sm3+ activated phosphor consists of three intense emission peaks in yellow, orange-red and red regions, respectively at 567, 604 and 650 nm. Intense characteristic emissions show no concentration quenching up to 2 mol% concentration of rare earth ions. The phosphors could be effectively excited by near UV (Dy3+ activated phosphor) and visible light (Eu3+ and Sm3+ activated phosphors) and give emission hues from orange-red to near white, demonstrating their potential suitability for application in solid state lighting.
K. V. Dabre, Ka-Young Park and S. Dhoble
K.V. Dabre, S.J. Dhoble, and Jyoti Lochab
Elsevier BV
K. V. Dabre;S. J. Dhoble
International Association of Advanced Materials
In this work we report the synthesis of CaWO4 pure and doped by various concentration of Eu 3+ by solid state method. Crystallinity and formation of as-synthesized phosphors were confirmed by XRD technique. PL emission of the Eu 3+ activated as-synthesized phosphors shows the strong red emission at 619nm which corresponds to the characteristic transition 5 D0 → 7 F2 of Eu 3+ ion at excitation wavelength 273nm. TL glow curve of Eu 3+ activated CaWO4 shows the two glow peaks was observed at 400K and 500K whereas undoped CaWO4 shows only single peak observed at low temperature (354K). Doping effect on TL glow curve was discussed. Glow curve of Eu 3+ activated were fitted to five peaks which were analyzed and trap parameter were calculated by using Chens’ method, and the dose response curve shows the phosphor is fairly sensitivity to lower dose also. Thus reported phosphor can be applicable in LED and environmental dosimetry. Copyright © 2013 VBRI press.