@article { ISI:000230436500003, title = {Photoluminescent core-shell particles of organic dye in silica}, journal = {Journal of Luminescence}, volume = {114}, number = {1}, year = {2005}, month = {JUL}, pages = {15-23}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Using a single silica precursor, Rhodamine 6G organic dye molecules have been entrapped in silica particles resulting into core-shell particles of similar to 500 nm diameter. Energy dispersive X-ray analysis, X-ray photoelectron spectroscopy and transmission electron microscopy analysis reveals that dye molecules are trapped inside the silica particles. Photoluminescence investigations show that highly luminescent and photostable core-shell particles are formed. Such core-shell particles can be easily suspended in water and would be useful for a variety of applications. However, there is a blue shift in the photolumineseence wavelength in case of core-shell particles compared to bare dye powder sample. (c) 2004 Elsevier B.V. All rights reserved.

}, keywords = {core-shell, Luminescence, Nanoparticles, photoemission, RH06G dye, tetraethylorthosilicate (TEOS)}, issn = {0022-2313}, doi = {10.1016/j.jlumin.2004.11.005}, author = {Ethiraj, Anita S. and Hebalkar, Neha and Kharrazi, Sharmin and Urban, J. and Sainkar, S. R. and Kulkarni, S. K.} } @article { ISI:000249567000022, title = {Highly photostable dye entrapped core-shell particles}, journal = {Materials Letters}, volume = {61}, number = {25}, year = {2007}, month = {OCT}, pages = {4738-4742}, publisher = {ELSEVIER SCIENCE BV}, type = {Article}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Organic dye namely Coumarin 7 has been entrapped in silica particles using a single silica precursor viz. tetraethylorthosilicate. Both bare Coumarin 7 dye and dye incorporated core-shell particles were studied. Investigations of these core-shell composites were carried out using different characterization techniques such as energy dispersive X-ray analysis, X-ray photoelectron spectroscopy and transmission electron microscopy. It has been shown that the photostability of dye molecules is improved along with an increase in photoluminescence. (c) 2007 Elsevier B.V. All rights reserved.

}, keywords = {core-shell, coumarin 7 dye, Luminescence, photostability, tetraethylorthosilicate}, issn = {0167-577X}, doi = {10.1016/j.matlet.2007.03.030}, author = {Ethiraj, Anita S. and Kharrazi, Sharmin and Hebalkar, Neha and Urban, J. and Sainkar, S. R. and Kulkarni, S. K.} } @article { ISI:000258195800007, title = {Low temperature synthesis of ZnSe nanoparticles}, journal = {Materials Letters}, volume = {62}, number = {23}, year = {2008}, month = {AUG}, pages = {3803-3805}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Synthesis of thioglycerol capped zinc selenide nanoparticles with a relatively narrow size distribution by a simple and inexpensive low temperature (similar to 80 degrees C) wet chemical method is reported here. Main advantage of this method is the use of non-toxic precursors. The size of the nanoparticles can be varied easily by changing the concentration of the capping agent. The extracted nanoparticles remain stable under normal atmospheric conditions and can be redispersed in suitable solvents. The sharp absorption features obtained in the UV-Visible absorption spectra reveal the formation of monodispersed ZnSe nanoparticles. The nanoparticles were characterized using X-ray photoelectron spectroscopy, X-ray diffraction, UV-Visible absorption spectroscopy, photoluminescence and transmission electron microscopy. (C) 2008 Elsevier B.V. All rights reserved.

}, keywords = {Luminescence, Nanomaterials, Semiconductor, X-ray techniques}, issn = {0167-577X}, doi = {10.1016/j.matlet.2008.04.082}, author = {Deshpande, Aparna and Singh, Shashi B. and Abyaneh, Majid Kazemian and Pasricha, Renu and Kulkarni, S. K.} } @article { ISI:000262886200019, title = {Epitaxially grown zinc-blende structured Mn doped ZnO nanoshell on ZnS nanoparticles}, journal = {Materials Research Bulletin}, volume = {44}, number = {2}, year = {2009}, month = {FEB}, pages = {339-344}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

Zinc oxide in the bulk as well as in the nanocrystalline form is thermodynamically stable in the wurtzite structure. However, zinc oxide in the zinc-blende structure is more useful than that in the wurtzite structure due to its superior electronic properties as well as possibility of efficient doping. Therefore, zinc oxide shell is grown epitaxially on zinc sulphide core nanoparticles having zinc-blende structure. It is shown that doping of manganese could be achieved in zinc oxide nanoshell with zinc-blende structure. (C) 2008 Elsevier Ltd. All rights reserved.

}, keywords = {Chemical synthesis, Luminescence, Nanostructures, Semiconductors, X-ray diffraction}, issn = {0025-5408}, doi = {10.1016/j.materresbull.2008.05.015}, author = {Limaye, Mukta V. and Singh, Shashi B. and Date, Sadgopal K. and Gholap, Ramkrishna S. and Kulkarni, Sulabha K.} } @article { ISI:000289376200002, title = {Electrochemical fluorescence switching from a patternable poly(1,3,4-oxadiazole) thin film}, journal = {Macromolecular Rapid Communications}, volume = {32}, number = {8}, year = {2011}, month = {APR}, pages = {637-643}, publisher = {WILEY-BLACKWELL}, address = {COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA}, abstract = {

A highly soluble poly(1,3,4-oxadiazole) (POD) substituted with long alkyl chains was examined for electrochemical fluorescence switching. The high solubility of the polymers enabled a simple fabrication of an electrochemical cell, which showed reversible fluorescence switching between dark (n-doping) and bright (neutral) states with a maximum on/off ratio of 2.5 and a cyclability longer than 1000 cycles. Photochemical cleavage of the oxadiazole in POD allowed photo-patterning of the POD film upon exposure to UV source. The patterned POD films displayed patterned image reversibly under a step potential of +1.8/-1.8V.

}, keywords = {fluorescence, lithography, Luminescence, photochemistry, switching device}, issn = {1022-1336}, doi = {10.1002/marc.201000791}, author = {Seo, Seogjae and Kim, Yuna and You, Jungmok and Sarwade, Bhimrao D. and Wadgaonkar, Prakash P. and Menon, Shamal K. and More, Arvind S. and Kim, Eunkyoung} } @article { ISI:000316238400025, title = {One pot synthesis, growth mechanism and optical properties of Zn1-xCdxSe graded core/shell and alloy nanocrystals}, journal = {Journal of Luminescence}, volume = {135}, year = {2013}, month = {MAR}, pages = {154-159}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Comparatively higher photoluminescence yield along with robustness of core/shell semiconductor nanocrystals make them attractive candidates for studying intricate quantum size effects. Here, we report, one pot synthesis of Zn1-xCdxSe graded core/shell structures by exploiting change in the reactivity of precursors. Optical and structural measurements indicate formation of graded structure. Growth mechanism probed by inductively coupled plasma atomic emission spectroscopy shows formation of graded core/shell structure, with CdSe rich core and ZnSe rich shell. Annealing these nanocrystals, in chemical bath, leads to diffusion of Cd from core to shell region. Formation of Zn1-xCdxSe alloy is also observed in X-ray photoelectron spectroscopic measurements, confirming the diffusion of Cd from core to shell region. Substantially high photoluminescence quantum efficiency of 60\% with narrow line width of about 27 nm, was observed and is attributable to the reduced strain due to graded core/shell structure. (C) 2012 Elsevier B.V. All rights reserved.

}, keywords = {Graded core/shell, II-VI Semiconductor, Luminescence, Optical properties, Semiconductor alloy}, issn = {0022-2313}, doi = {10.1016/j.jlumin.2012.10.042}, author = {Sonawane, Kiran G. and Patil, K. R. and Mahamuni, Shailaja} } @article { ISI:000338820600009, title = {Synthesis and luminescence of graphene-nano calcium sulphide composite}, journal = {Materials Chemistry and Physics}, volume = {147}, number = {1-2}, year = {2014}, month = {SEP}, pages = {57-64}, publisher = {ELSEVIER SCIENCE SA}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

Graphene-nanocrystalline calcium sulphide has been synthesized using in-situ reduction of calcium salt and graphene oxide. Graphene oxide was prepared using Hummer{\textquoteright}s method. Surface morphology and crystal structure of samples were observed by transmission electron microscopy (TEM) and X-Ray diffraction (XRD). Ultra thin graphene and graphene oxide sheets with size ranging between tens to several hundreds of square nanometers are observed in TEM images. The TEM micrographs of G-CaS show that CaS particles are embedded in graphene sheets and the average particle size of CaS particles in the composite is less than 50 nm. The reduction in the intensity of various functional groups in FTIR spectrum also confirms the formation of graphene. The UV-Visible spectra of CaS shows absorption peak at 220 nm with a small shoulder at 250 nm whereas in G-CaS 220 nm absorption peak has reduced intensity and the shoulder at 250 nm has now shifted to 270 nm due to modification in the defect structure of CaS by graphene. CaS and G-CaS shows photoluminescence emission at 470 nm (lambda(exc.) = 375 nm) and 440 nm (lambda(exc.) = 350 nm) respectively, however emission intensity of G-CaS is relatively lower than CaS. Although the emission intensity is found to be lower than CaS, addition of CaS to graphene in G-CaS complex has made graphene luminescent. XPS spectra also indicate reduction of various oxygen containing functional groups in highly reduced graphene oxide and G-CaS. (C) 2014 Elsevier B.V. All rights reserved.

}, keywords = {Luminescence, Nanostructures, powder diffraction, Precipitation}, issn = {0254-0584}, doi = {10.1016/j.matchemphys.2014.04.006}, author = {Sharma, Geeta and Patil, K. R. and Gosavi, S. W.} } @article { ISI:000364265500015, title = {Arsenic detection in water: YPO4:Eu3+ nanoparticles}, journal = {Journal of Solid State Chemistry}, volume = {232}, year = {2015}, month = {DEC}, pages = {83-90}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

This work reports on the novel technique of detection of arsenic in aqueous solution utilising the luminescence properties of lanthanide doped nanomaterials. Eu3+ (5\%) doped YPO(4)nanorodswere utilised for the said experiment. Co-precipitation method was used for the synthesis of the materials and characterised them with different instrumental techniques like X-ray diffraction (XRD), Infra-red (IR), UV-absorption, scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence studies. This nanoparticle can adsorb both arsenic and arsenious acids. We studied the effect of arsenic adsorption on the luminescence behaviour of the nanoparticles. Arsenic acid enhanced the luminescence intensity whereas arsenious acid quenched the luminescence. This luminescence enhancement or quenching is related with arsenic concentration. This relation of luminescence property with concentration of arsenic can be used to detect arsenic in industrial waste. (C) 2015 Elsevier Inc. All rights reserved.

}, keywords = {Arsenic detection, Luminescence, Nanomaterials}, issn = {0022-4596}, doi = {10.1016/j.jssc.2015.09.009}, author = {Ghosh, Debasish and Luwang, Meitram Niraj} } @article { ISI:000358370700007, title = {Identifying solid luminogens through gold-catalysed intramolecular hydroarylation of alkynes}, journal = {European Journal of Organic Chemistry}, number = {22}, year = {2015}, month = {AUG}, pages = {4860-4867}, publisher = {WILEY-V C H VERLAG GMBH}, address = {POSTFACH 101161, 69451 WEINHEIM, GERMANY}, abstract = {

The identification of a new class of luminogens based on pyrrolo-quinoxaline embedded coumarin (PQC) structures is reported. The reaction relies on the gold-catalyzed hydroarylation reaction of appropriately substituted aryl alkynoates that produces molecules that exhibit solvatochromism and aggregation-induced emission enhancement (AIEE) phenomena. The application of PQCs for live cell imaging has also been demonstrated.

}, keywords = {Cell imaging, Dyes/pigments, fluorescence, Gold, Luminescence, Solvatochromism}, issn = {1434-193X}, doi = {10.1002/ejoc.201500503}, author = {Shaikh, Aslam C. and Shalini, S. and Vaidhyanathan, Ramanathan and Mane, Manoj V. and Barui, Ayan Kumar and Patra, Chitta Ranjan and Venkatesh, Yeduru and Bangal, Prakriti Ranjan and Patil, Nitin T.} } @article { ISI:000370900600019, title = {Photoluminescent tetrahedral d(10)-metal Schiff base complexes exhibiting highly ordered mesomorphism}, journal = {Polyhedron}, volume = {105}, year = {2016}, month = {FEB}, pages = {150-158}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A series of four-coordinate d(10)-metal complexes of the type [ML2] {M = Zn, Cd, Hg; L = 4-nitro-2-((octadecylimino)methyl)phenol}, incorporating a new N-alkylated bidentate [N,O]-donor salicylaldimine Schiff base ligand, has been synthesized and characterized by elemental analyses, FT-IR, UV-Vis, H-1 NMR and FAB-mass spectroscopies. The ligand is non-mesomorphic and devoid of any photoluminescence. The zinc(II) and cadmium(II) complexes displayed highly ordered mesophases reminiscent of soft crystals. The phases have been characterized by polarizing optical microscopy (POM), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD) studies. The complex of mercury(II) decomposed prior to melting. An orthogonal symmetry with a {\textquoteleft}herringbone{\textquoteright} array for the zinc complex and a primitive triclinic symmetry (p(1)) for the cadmium complex, respectively, has been proposed. The complexes exhibited fluorescence at room temperature, both in the solution and in the solid state, with emission maxima in the blue region. Density functional theory (DFT) calculations carried out using the GAUSSIAN 09 program at the B3LYP level revealed a distorted tetrahedral geometry around the metal center in all the complexes. Natural bond orbital (NBO) analysis suggested appreciable charge transfer from the ligand to the metal center in the complexes. (C) 2015 Elsevier Ltd. All rights reserved.

}, keywords = {Density functional theory, Luminescence, Mesophase, Schiff base, X-ray diffraction}, issn = {0277-5387}, doi = {10.1016/j.poly.2015.11.053}, author = {Chakraborty, Sutapa and Purkayastha, Debraj Dhar and Das, Gobinda and Bhattacharjee, Chira R. and Mondal, Paritosh and Prasad, S. Krishna and Rao, D. S. Shankar} } @article { ISI:000368952100001, title = {Selective detection of Fe3+, Cr3+ and Cu2+ in water using highly luminescent Gd2O3:Eu3+ nanoparticles}, journal = {Journal of Luminescence}, volume = {171}, year = {2016}, month = {MAR}, pages = {1-8}, publisher = {ELSEVIER SCIENCE BV}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, abstract = {

Rod shaped Eu3+ doped Gd2O3 nanoparticles were synthesised by a simple wet-chemical method followed by high temperature heating at 700 degrees C. The nanoparticles were characterised by X-ray diffraction (XRD), infra-red (IR), transmission electron microscopy (TEM), x-ray photonelectron spectroscopy (XPS), photoluminescence (PL) studies and lifetime measurement. The particles show strong host sensitised luminescence in water. Luminescence in water is selectively quenched by Fe3+, Cr3+ and Cu2+ ions. This luminescence quenching phenomenon has been utilised to detect metal ions in synthetic water and environmental water samples. Results obtained by luminescence quenching for environmental water samples are in good agreement with the results obtained from inductively coupled plasma atomic emission spectroscopy (ICP-AES) study. (C) 2015 Elsevier B.V. All rights reserved.

}, keywords = {Detection, Luminescence, Nanoparticles, Quenching, Sensitization}, issn = {0022-2313}, doi = {10.1016/j.jlumin.2015.10.020}, author = {Ghosh, Debasish and Luwang, Meitram Niraj} } @article {43954, title = {Multicolour and nearly white light emission in YP0.8V0.2O4:Sm3+ nanorods: controlled energy transfer}, journal = {Journal of Alloys and Compounds}, volume = {726}, year = {2017}, month = {DEC}, pages = {1161-1167}, type = {Journal Article}, abstract = {Nanorods of YP0.8V0.2O4:Sm{\textthreesuperior}$^{+}$ have been synthesized under hydrothermal conditions. Substitution of vanadium (V$^{5}$$^{+}$) sites in YVO4 by phosphorus ions (P$^{5}$$^{+}$) has been confirmed by Fourier transform infrared spectroscopy, X-ray diffraction and transmission electron microscopy. Careful selection of Sm{\textthreesuperior}$^{+}$ concentration in YP0.8V0.2O4 enables to achieve the controlled energy transfer from the VO4{\textthreesuperior}$^{-}$ absorption to the excited states of Sm{\textthreesuperior}$^{+}$ ions. The controlled energy transfer has been confirmed from the steady state luminescence and decay lifetime studies of VO4{\textthreesuperior}$^{-}$ emission. With the controlled retention of VO4{\textthreesuperior}$^{-}$ emission, tuning of light emission from the singly (Sm{\textthreesuperior}$^{+}$) doped YP0.8V0.2O4 nanorods is realized. At a particular doping concentration of Sm{\textthreesuperior}$^{+}$ (1.25 at.\%), a nearly white light emission is observed. The quantum yield of this nearly white light emission is found to be \~{}28\%. Tunability of the light and white light emission are supported by CIE chromaticity. The energy transfer efficiency from the VO4{\textthreesuperior}$^{-}$ absorption to the excited states of Sm{\textthreesuperior}$^{+}$ ion in YP0.8V0.2O4 reaches upto \~{}86\% with the doping concentration of 2.25 at.\%. }, keywords = {Energy Transfer, Luminescence, Multicolor, Nanorod}, doi = {10.1016/j.jallcom.2017.08.099}, author = {Singh, N.S.}, editor = {Wangkhem, R.} } @article {47096, title = {Role of Nd3+ concentration on the microstructure and scintillation behaviour of langbeinite sulphate}, journal = {Materials Letters}, volume = {284}, year = {2021}, month = {FEB }, pages = {128997}, type = {Article}, abstract = {

Langebeinite (K2Ca2(SO4)(3)) ceramics doped with increasing concentrations of Nd3+ ions (0.01-0.04 mol\%) was prepared by wet chemical precipitation and calcination at 800 degrees C. Thermal studies revealed high temperature stability of the phosphors. UV-VIS-NIR spectroscopic analysis of phosphors reveal strong absorption peaks representing f -\> f transitions. Direct bandgap derived from Kubelka-Munk plot was found to be similar to 5.66 eV. FTIR studies reveal tetrahedral symmetry of the SO42 ions. SEM micrographs reveal the formation of phosphors with wide particle size distribution and elemental composition was analysed using EDX studies. Scintillation studies representing a single high intensity peak around 784 nm is ascribed to I-4(9/2) -\> F-4(5/2) + H-2(9/2) transition. Langbeinite phosphor with 0.02 mol\% of Nd3+ exhibited maximum emission intensity indicating optimal concentration for scintillation studies favouring the development of NIR emitting phosphors. (c) 2020 Elsevier B.V. All rights reserved.

}, keywords = {Ceramics, Langebeinites, Luminescence, Microstructure, Neodymium, Scintillation}, issn = {0167-577X}, doi = {10.1016/j.matlet.2020.128997}, author = {Poornima, Velswamy and Mohan, Subramaniam and Uma, Tiruchirappalli Sivagnanam} }