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RISS 인기검색어
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- 저자 : Vinod Taxak (검색결과 2 건)
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Vinod Taxak,Satyender Pal khatkar,Sonika Singh,Sheetal Lohra,Avni Khatkar 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.3
A color tunable terbium doped GdSrAl3O7 nanophosphor has been synthesized at low temperature using solution combustion synthesis. The photoluminescent properties of nanophosphors have been explored by analyzing their excitation and emission spectra alongwith their decay curves. The emission spectra exhibit dominating green light at 544 nm due to 5D4→7F5 transition of Tb3+ ions in GdSrAl3O7 on excitation by UV light of 239 nm. Furthermore, the luminescence in Gd(1-x)SrAl3O7: xTb3+ nanophosphors shifted from blue to green color by properly tuning the concentration of terbium ions. Decay curves indicate that non-radiative cross-relaxation is primarily responsible for concentration quenching phenomenon in the GdSrAl3O7 host. X-ray diffraction (XRD) analysis confirmed that single tetragonal phased nanophosphor could be readily obtained at low temperature 550°C. The smooth surfaced nanocrystals with particle size of 45 - 50 nm have also been examined by transmission electron microscopy (TEM). All these features augmented the probability of GdSrAl3O7: Tb3+ nanophosphor for potential applications in optical devices.
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Synthesis by Using the Combustion Method and Photoluminescence of SrZnO2 :Tb3+ Nanophosphors
Satyender Pal khatkar,Sang Do Han,Chi Hwan Han,Dinesh Kumar,Gaytri Sharma,Vinod Bala Taxak 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
SrZnO2:Tb3+ nanocrystals were synthesized by using a combustion route with metal nitrates as precursors and urea as a fuel in a furnace preheated to 500 C. The nanocrystals obtained through combustion synthesis were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD) techniques. The nanocrystals had sizes from 27 nm to 43 nm. The nanocrystals prepared under an UV source revealed green luminescence that was attributed to transitions from the 5D4 excited state to the 7FJ (J = 3 . 6) ground state of Tb3+ ions. The predominant green color from the magnetic dipole transition 5D4 ! 7F5 of Tb3+ was located at 545 nm. In addition, the dependence of the luminescence intensity on the Tb3+ concentrations and effect of heat treatment on the size of the nanocrystals are discussed. The intensity of the 5D4 emission increases with increasing sintering temperature while that of the 5D3 emission decreases.own
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