Efficient sensitization of Tb³⁺ emission by Dy³⁺ in CaMoO₄ phosphors: Energy transfer, tunable emission and optical thermometry

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• 作者：Xinyue Li^a ; Mingbin Dong^a ; Fangfang Hu^a ; Yanguang Qin^a ; Lu Zhao^a ; Xiaotao Wei^a ; ^b ; ^{wxt@ustc.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yonghu Chen^a ; Changkui Duan^a ; Min Yin^a ; ^{yinmin@ustc.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CaMoO4 phosphors ; Energy transfer process ; Tunable emission ; Optical thermometry
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：42
• 期：5
• 页码：6094-6099
• 全文大小：1012 K

文摘

Dy³⁺/Tb³⁺ codoped CaMoO₄ phosphors were synthesized by a simple sol–gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy. The energy transfer process of Dy³⁺→Tb³⁺ was confirmed by excitation and emission spectra and luminescence decay curves, and the energy transfer efficiency was also estimated. The results verified that the efficient emission of Tb³⁺ was sensitized by Dy³⁺ under the excitation of 354 nm, realizing tunable emission in CaMoO₄ phosphors. Furthermore, optical thermometry was achieved by the fluorescence intensity ratio between Tb³⁺: ⁵D₄→⁷F₅ (~546 nm) and Dy³⁺: ⁴F_9/2→⁶H_13/2 (~575 nm). It is expected that the investigated CaMoO₄ nanograins doped with Dy³⁺/Tb³⁺ have prospective applications in display technology and optical thermometry.