Sensitized luminescence and energy transfer in Ce and Eu codoped calcium magnesium chlorosilicate期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Sensitized luminescence and energy transfer in Ce and Eu codoped calcium magnesium chlorosilicate

Authors:	H Lin X R Liu E Y B Pun

Affiliation:	^a Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, People's Republic of China ^b Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022, People's Republic of China

Abstract:	Ce³⁺ and Eu²⁺ ions codoped calcium magnesium chlorosilicate Ca₈Mg(SiO₄)₄Cl₂] phosphors have been synthesized and characterized. Intense bluish-green light was observed under ultraviolet and blue light excitations. The diffuse reflection, excitation and emission spectra of Ca₈Mg(SiO₄)₄Cl₂:Ce³⁺,Eu²⁺ were measured at room temperature, and enhancement of Eu²⁺ emission was confirmed. The fluorescence lifetimes of Ce³⁺ were measured, and the mechanism of nonradiative energy transfer from Ce³⁺ to Eu²⁺ is found to be electric dipole–dipole interaction. The probabilities and efficiencies of nonradiative energy transfer were also calculated, and the results indicate that the efficiency can be as high as 86% in this material system.

Keywords:	Calcium magnesium chlorosilicate Sensitized luminescence Ce³⁺ Eu²⁺ Energy transfer
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