Synthesis and photoluminescence properties of Ln³⁺ (Ln³⁺=Tb³⁺, Dy³⁺, Sm³⁺, Er³⁺)-doped Ca₂Nb₂O₇ phosphors

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• 作者：Jieqiang Xian ; Shuangping Yi ; ^{yispgd@163.com" class="auth_mail" title="E-mail the corresponding author} ; Yaomin Deng ; Lu Zhang ; Xiaoxue Hu ; Yinhai Wang
• 关键词：Phosphors ; Critical distance ; Ca2Nb2O7 ; Concentration quenching
• 刊名：Physica B: Physics of Condensed Matter
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：483
• 期：Complete
• 页码：19-25
• 全文大小：2229 K

文摘

A series of Ln³⁺ (Ln³⁺=Tb³⁺/Dy³⁺/Sm³⁺/Er³⁺) ions doped Ca₂Nb₂O₇ phosphors have been synthesized by high-temperature solid-state reaction. The Ln³⁺-doped samples are well indexed to the pure Ca₂Nb₂O₇ phase which revealed for the X-ray diffraction (XRD) result. Under the ultraviolet light, the prepared Ca_2−xNb₂O₇:xLn³⁺ (Ln³⁺=Tb³⁺/Dy³⁺/Sm³⁺/Er³⁺) phosphors show the characteristic cyan (Tb³⁺), green–white (Sm³⁺), yellowish (Dy³⁺) and green (Er³⁺) emissions. The energy transfer mechanisms in Ca₂Nb₂O₇: Tb³⁺/Dy³⁺/Sm³⁺/Er³⁺ phosphors have been investigated and it deduced to be a resonant type via an electric dipole–dipole interaction. In addition, their critical distances have been calculated by concentration quenching methods. The luminescence properties of Ca₂Nb₂O₇:Tb³⁺/Dy³⁺/Sm³⁺/Er³⁺ phosphors indicated that the Ca₂Nb₂O₇ is a suitable host for rare earth doped laser crystal and optical materials.