Effects of Er³⁺ concentration on down-/up-conversion luminescence and temperature sensing properties in NaGdTiO₄: Er³⁺/Yb³⁺ phosphors

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• 作者：Xiangping Li ; Xin Wang ; Hua Zhong ; Lihong Cheng ; ^{cheng-lihong@126.com" class="auth_mail" title="E-mail the corresponding author} ; Sai Xu ; Jiashi Sun ; Jinsu Zhang ; Xuejing Li ; Lili Tong ; Baojiu Chen ; ^{chenmbj@sohu.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Concentration quenching ; Down-conversion ; Up-conversion ; Temperature sensing
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：42
• 期：13
• 页码：14710-14715
• 全文大小：597 K

文摘

Usually, Er³⁺ doping concentration effect on the temperature sensing properties of Er³⁺ containing materials is ignored. In this work, we demonstrated the influence of Er³⁺ concentration and excitation path on the spectral and temperature sensing properties in Er³⁺, Yb³⁺ co-doped NaGdTiO₄ system. The NaGdTiO₄: Er³⁺/Yb³⁺ phosphors were prepared by a high temperature solid state reaction method. Different spectral patterns for down- and up-conversion processes were observed and ascribed to the different excitation and population routes. The concentration quenching behaviors for down- and up-conversion processes were explained via cross relaxations between Er³⁺ ions. Most importantly, the Er³⁺ concentration dependent optical temperature sensing performance was observed and experimentally explained as a fact that the optical transition rate of Er³⁺ in different samples was changed with various Er³⁺ doping concentration.