Web Release Date: November 20,
Size Manipulated Photoluminescence and Phosphorescence in CaTiO3:Pr3+ Nanoparticles
and
Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, 16 Eastern South Lake Road, Changchun 130033, China, Graduate School of Chinese Academy of Sciences, Beijing, 100039, China, and Department of Physics, Georgia Southern University, Statesboro, Georgia 30460
Received: August 1, 2007
In Final Form: September 21, 2007
Abstract:
Red emitting nanophosphors of CaTiO3:Pr3+ with various particle sizes were prepared by sol-gel methods and structurally characterized by X-ray diffraction and field emission scanning electron microscopy. The fluorescent and phosphorescent properties of CaTiO3:Pr3+ nanoparticles as a function of particle sizes were investigated by using photoluminescence and photoluminescence excitation spectra as well as time decay patterns of fluorescence and phosphorescence. On the analysis of the longer lifetimes at 300 K as compared to that at 77 K and the appearance of maximal photoluminescence, the dependence of photoluminescence on phosphorescence is demonstrated. A very highly efficient phosphorescence recombination channel in the nanophosphor is proposed and discussed. This work provides a promising method to develop novel phosphors by manipulating the number of traps on the surface of nanophosphors through adjusting the particle size.
Download the full text: PDF | HTML
