Time filter

Source Type

Ingle J.T.,Jd Institute Of Engineering And Technology | Gawande A.B.,Arts and Commerce College | Sonekar R.P.,Arts and Commerce College | Omanwar S.K.,Sant Gadge Baba Amravati University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

The inorganic Oxy-borate host phosphors YCa4O(BO 3)3:RE3+ (RE = Eu3+,Tb3+) were synthesized by a novel solution combustion technique. The synthesis is based on the exothermic reaction between the fuel (Urea) and Oxidizer (Ammonium nitrate). The heat generated in reaction is use for auto combustion of precursors. The structures of the prepared samples were confirmed by powder XRD technique. The photoluminescence properties of the powder samples were investigated under UV and VUV excitation; "The phosphor YCa 4O(BO3)3:Eu3+and YCa 4O(BO3)3:Tb3+ shows strong absorption in UV and VUV region and exhibits intense red and green emission upon excited by 254 nm UV and 147 nm VUV radiation". © 2013 Elsevier B.V. All rights reserved.


Ingle J.T.,Jd Institute Of Engineering And Technology | Sonekar R.P.,Arts and Commerce College | Omanwar S.K.,Sant Gadge Baba Amravati University | Wang Y.,Lanzhou University | Zhao L.,Lanzhou University
Journal of Alloys and Compounds | Year: 2014

An efficient and chromatic red emitting borate host phosphors (Y 1-x-y,Gd x)BaB9O16:Eu3+y were prepared by a simple route of solution combustion technique for different composition of host (0 ≤ x ≤ 0.97, y = 0.03). The synthesis is based up on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate). The heat generated in reaction is utilized for auto combustion of ingredients. Crystal structure and phase formation of product was identified by powder XRD technique while particle morphology was studied by FE-SEM. The photoluminescence (PL) properties under 252 nm ultraviolet (UV) and 147 nm vacuum ultraviolet (VUV) excitation were investigated. It was found that for increasing concentration of Gd dominant emission shift towards longer wavelength and more chromatic side while for optimal doping concentration of Gd 3+ ions an intermediate role for energy transfer mechanism from sensitizer to activator is highly efficient which increase transition probability of electric dipole of 5D0 → 7F2 of Eu3+ ion to emits pure and intense red line at 615 nm. This phosphor could be potential candidate for plasma display panel (PDPs) and mercury free lamps. © 2014 Elsevier B.V. All rights reserved.


Palaspagar R.S.,Jd Institute Of Engineering And Technology | Gawande A.B.,Sant Gadge Baba Amravati University | Sonekar R.P.,Gs College | Omanwar S.K.,Sant Gadge Baba Amravati University
Journal of Luminescence | Year: 2014

A series of red emitting Li2EuxAl 2(1-x)B2O7 (LABO) (x=0.001, 0.002, 0.005, 0.01, 0.02) phosphors were prepared by a solution combustion technique. The structure and surface morphology of synthesized phosphors were characterized by powder XRD and SEM and their photoluminescent properties under UV excitation were also investigated. The results indicate that phosphors are suitable for excitation under UV light at 254 nm. The dominant transition of Eu3+ in LABO is the electric dipole transition 5D0→7F 2 with the red emission around 616 nm. Eu3+ ions occupy both Al3+ and Li2+ sites in LABO. The optimum concentration for Eu3+ sites in LABO was observed to be 1 mol%. The photoluminescent excitation and emission spectra indicate the excellent red emitting property of Li2Al2B2O 7:Eu3+ phosphors due to the characteristic transitions of Eu3+ from 5D0→7Fj (j=0, 1, 2, 3, and 4). © 2014 Elsevier B.V.


Ingle J.T.,Jd Institute Of Engineering And Technology | Sonekar R.P.,Arts and Commerce College | Omanwar S.K.,Sant Gadge Baba Amravati University | Wang Y.,Lanzhou University | Zhao L.,Lanzhou University
Solid State Sciences | Year: 2014

The polycrystalline powder samples of Eu3+ activated; mixed metal yttrium borate phosphors M3Y2(BO3) 4 (M = Ba, Sr) with improved color purity of red emission for plasma display panels (PDPs) were prepared by solution combustion technique. The synthesis is based up on the exothermic reaction between the fuel (Urea) and oxidizer (Ammonium nitrate).The heat generated in the reaction is utilized for auto combustion of ingredients. The formation of desired product and crystal structure was confirmed by powder XRD technique; while particle morphology was studied using FE-SEM. Samples under 254 and 147 nm excitation showed intense and pure red emission around 613 nm corresponding to the electric dipole 5D0 → 7F2 transition of Eu 3+, CIE chromaticity coordinates of synthesized phosphors was found to be (x = 0.67, y = 0.32) close to National Television Standard Committee (NTSC) for red color; found suitable to employ in plasma display panels (PDPs) applications. © 2014 Elsevier Masson SAS. All rights reserved.


Ingle J.T.,Jd Institute Of Engineering And Technology | Sonekar R.P.,Arts and Commerce College | Omanwar S.K.,Sant Gadge Baba Amravati University | Wang Y.,Lanzhou University | Zhao L.,Lanzhou University
Optical Materials | Year: 2014

The optimization of primary phosphors required for display panels were carried out. Phosphors were synthesized by simple solution combustion technique. The synthesis is based on the exothermic reaction between the fuel (urea) and oxidizer (ammonium nitrate).The heat generated in the reaction is used for auto combustion of precursors. The crystal structures of the prepared samples were confirmed by powder XRD technique and particle morphology by FE-SEM. The Photoluminescence properties were investigated under ultraviolet (UV) and vacuum ultraviolet (VUV) radiations respectively. Prepared phosphors were found to have the best luminous performance with respect to intensity and color purity under 254 nm and 147 nm wavelength radiations. © 2014 Elsevier B.V. All rights reserved.


Ingle J.T.,Jd Institute Of Engineering And Technology | Gawande A.B.,Sant Gadge Baba Amravati University | Sonekar R.P.,Arts and Commerce College | Nagpure P.A.,Shivaji Science College | Omanwar S.K.,Sant Gadge Baba Amravati University
AIP Conference Proceedings | Year: 2013

The red emitting borate host phosphor YCaBO4:Eu3+ has been prepared by a novel solution combustion technique. The synthesis is based on the exothermic reaction between the fuel (Urea) and Oxidizer (Ammonium nitrate). The photoluminescence properties of the powder samples of YCaBO4:Eu3+ has been investigated under UV and VUV excitation. The phosphor shows strong absorption in UV and VUV region and exhibits intense red emission upon excited by 254 nm UV and 173 nm VUV radiation. Under UV 254 nm excitation, YCaBO4:Eu3+ exhibits intense red emission around 610 nm. Under VUV excitation of 173 nm, the phosphor emits intense red emission around 610 nm and few weak emissions. These weak emissions could be suppressed by annealing the sample repeatedly at proper temperature and the borate phosphor YCaBO4:Eu3+ could be a good red emitting phosphor for PDP display and mercury free lamps. © 2013 AIP Publishing LLC.

Loading Jd Institute Of Engineering And Technology collaborators
Loading Jd Institute Of Engineering And Technology collaborators