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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