Gd(1.96-x)Y(x)Eu0.04O3 (x = 0.0, 0.49, 0.98, 1.47, 1.96 mol%) nanophosphors: propellant combustion synthesis, structural and luminescence studies.
Gd(1.96-x)Y(x)Eu0.04O3 (x = 0.0, 0.49, 0.98, 1.47, 1.96 mol%) nanophosphors were synthesized by propellant combustion method at low temperature (400°C). The powder X-ray diffraction patterns of as formed Gd1.96Eu0.04O3 showed monoclinic phase, however with the addition of yttria it transforms from monoclinic to pure cubic phase. The porous nature increases with increase of yttria content. The particle size was estimated from Scherrer's and W-H plots which was found to be in the range 30-40 nm. These results were in well agreement with transmission electron microscopy studies. The optical band gap energies estimated were found to be in the range 5.32-5.49 eV. PL emission was recorded under 305 nm excitation show an intense emission peak at 611 nm along with other emission peaks at 582, 641 nm. These emission peaks were attributed to the transition of (5)D0→(7)FJ (J = 0, 1, 2, 3) of Eu(3+) ions. It was observed that PL intensity increases with increase of Y content up to x = 0.98 and thereafter intensity decreases. CIE color co-ordinates indicates that at x = 1.47 an intense red bright color can be achieved, which could find a promising application in flat panel displays. The cubic and monoclinic phases show different thermoluminescence glow peak values measured under identical conditions. The response of the cubic phase to the applied dose showed good linearity, negligible fading, and simple glow curve structure than monoclinic phase indicating that suitability of this phosphor in dosimetric applications.
Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India.
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Shilpa
Department of Physics, B.M.S. Institute of Technology, Bangalore 560 064, India.
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Dhananjaya
Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur 572 103, India. Electronic address: bhushanvlc@gmail.com.
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Nagabhushana
Vice Chancellor, Chhattisgarh Swamy Vivekananda Technical University, North Park Avenue, Sector - 8, Bhilai, Chhattisgarh 490 009, India.
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Sharma
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India.
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Shivakumara
Department of Chemistry, B.M.S. Institute of Technology, Bangalore 560 064, India.
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Sudheerkumar
Department of Chemistry, M.S. Ramaiah Institute of Technology, Bangalore 560 054, India.
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Nagabhushana
CSIR-National Aerospace Laboratories (CSIR), Bangalore 560 017,India.
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Chakradhar
D005063:Europium / Q000737:chemistry*; D005682:Gadolinium / Q000737:chemistry*; D049449:Luminescence; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D014961:X-Ray Diffraction; D015019:Yttrium / Q000737:chemistry*
D010087:Oxides; D005063:Europium; D015019:Yttrium; D005682:Gadolinium
Nanomaterials; Photoluminescence; SEM; TEM; Thermoluminescence; X-ray diffraction