Luminescence properties and energy transfer in La₆Ba₄(SiO₄)₆F₂:Ce³⁺,Tb³⁺ phosphors

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• 作者：Qingfeng Guo ; Libing Liao ; Zhiguo Xia
• 关键词：Phosphors ; Luminescence ; Apatite ; Hexagonal ; Energy transfer
• 刊名：Journal of Luminescence
• 出版年：January, 2014
• 年：2014
• 卷：145
• 期：Complete
• 页码：65-70
• 全文大小：1511 K

文摘

A series of new luminescent emission-tunable phosphors La₆Ba₄(SiO₄)₆F₂:Ce³⁺,Tb³⁺ with apatite structure have been synthesized by a high temperature solid-state reaction. X-ray diffraction, photoluminescence (PL) emission and excitation spectra, lifetime, as well as the effect of Tb³⁺ concentration were employed to characterize the resulting samples. The PL spectrum of La₆Ba₄(SiO₄)₆F₂:Ce³⁺,Tb³⁺ phosphor contains both the asymmetric broad-band blue emission (Ce³⁺ ion) and the line-type green emission (Tb³⁺ ion). The increased Tb³⁺ concentration induced the emitting colors to shift from blue to green region by the naked eye. Meanwhile, the energy transfer between Ce³⁺ and Tb³⁺ is thoroughly investigated, and the energy-transfer efficiency from Ce³⁺ to Tb³⁺ ion is also calculated. The results indicated that these phosphors could be considered as double emission phosphors for n-UV excited white light-emitting diodes.