Extraction of Y2O3:Cr3+nanophosphor by eco-friendly approach and its suitability for white light-emitting diode applications.
Cr3+-doped Y2O3(0.5-9 mol%) was synthesized by a simple solution combustion method using Aloe vera gel as a fuel/surfactant. The final obtained product was calcined at 750°C for 3 h, which is the lowest temperature reported so far for the synthesis of this compound. The calcined product was confirmed for its crystallinity and purity by powder X-ray diffraction (PXRD) studies which showed a single-phase nano cubic phosphor. The particles size estimated by Scherrer formula was in the range of 6-19 nm. The UV-vis spectra showed absorption bands at 198, 272 and 372 nm having band gap energy in the range 4.00-4.26 eV. In order to investigate the possibility of its use in white light emitting display applications, the photoluminescence properties of Cr3+-doped Y2O3nanophosphors were studied at an excitation wavelength in the near ultraviolet (UV) light region (361 nm). The emission spectra consisted of emission peaks in the blue (4F9/2→6H15/2), orange (4F9/2→6H13/2) and red (4F9/2→6H11/2) regions. The CIE coordinates (0.33, 0.33) lie in the white light region. Hence Y2O3:Cr3+can be used for white light-emitting diode (LED) applications.
Department of Physics, GFGC Tumkur, Tumkur, 572 102, Karnataka, India.|Department of Physics, Sathyabama University, Chennai, 600 119, Tamilnadu, India.
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Prasanna Kumar
Department of Physics, Maharani's Science College, Palace Road, Bangalore, 560 001, India.
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Ramgopal
School of Physical sciences, REVA University, Bangalore, 560 064, Karnataka, India.
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DV
Sunitha
Department of Physics, B.M.S. Institute of Technology, VTU Belagavi affiliated, Bangalore, 560064, India.
B Daruka
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Prasad
CNR Rao Centre for Advanced Materials, Tumkur University, Tumkur, 572103, India.
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Nagabhushana
Department of Physics, Lalbahadur Shastry Govt., First Grade College, Bangalore, 560 032, India.
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Vidya
Dayanand Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore, 560 078, India.
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KS
Anantharaju
Research Centre, Department of Science, East West Institute of Technology, Bangalore, 560 091, India.
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SC
Prashantha
Dayanand Sagar University, Shavige Malleshwara Hills, Kumaraswamy Layout, Bangalore, 560 078, India.
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SC
Sharma
Department of Mechanical Engineering, R. V. College of Engineering, Bangalore, 560 059, India.
K R
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Prabhakara
D002857:Chromium / Q000737:chemistry*; D049449:Luminescence; D053758:Nanoparticles / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010316:Particle Size; D055668:Photochemical Processes; D013499:Surface Properties; D014466:Ultraviolet Rays; D015019:Yttrium / Q000737:chemistry*
D002857:Chromium; D015019:Yttrium; D010100:Oxygen
Aloe vera gel; Y2O3:Cr3+; green route; nanophosphor; nanostructures