Size Manipulated Photoluminescence and Phosphorescence in CaTiO3:Pr3+ Nanoparticles

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• 作者：Xianmin Zhang ; Jiahua Zhang ; Xia Zhang ; Meiyuan Wang ; Haifeng Zhao ; Shaozhe Lu ; Xiao-jun Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 13, 2007
• 年：2007
• 卷：111
• 期：49
• 页码：18044 - 18048
• 全文大小：240K
• 年卷期：v.111,no.49(December 13, 2007)
• ISSN：1932-7455

文摘

Red emitting nanophosphors of CaTiO₃:Pr³⁺ with various particle sizes were prepared by sol-gel methodsand structurally characterized by X-ray diffraction and field emission scanning electron microscopy. Thefluorescent and phosphorescent properties of CaTiO₃:Pr³⁺ nanoparticles as a function of particle sizes wereinvestigated by using photoluminescence and photoluminescence excitation spectra as well as time decaypatterns of fluorescence and phosphorescence. On the analysis of the longer lifetimes at 300 K as comparedto that at 77 K and the appearance of maximal photoluminescence, the dependence of photoluminescence onphosphorescence is demonstrated. A very highly efficient phosphorescence recombination channel in thenanophosphor is proposed and discussed. This work provides a promising method to develop novel phosphorsby manipulating the number of traps on the surface of nanophosphors through adjusting the particle size.