Optical temperature sensing through the upconversion luminescence from Ho³⁺/Yb³⁺ codoped CaWO₄

详细信息    查看全文

• 作者：Wei Xu ; Hua Zhao ; Yaxin Li ; Longjiang Zheng ; Zhiguo Zhang ; Wenwu Cao
• 关键词：Upconversion ; Ho3+ ions ; Blue emissions ; Temperature sensor
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：188
• 期：Complete
• 页码：1096-1100
• 全文大小：1133 K

文摘

Under 980 nm diode laser excitation, efficient upconversion emissions from the Ho³⁺/Yb³⁺ codoped CaWO₄ phosphor were obtained. The upconversion quantum efficiency was evaluated to be about 3.3 % when the power density of the excitation laser was 47 W/cm². Additionally, temperature dependent blue emissions from the ⁵F_2,3/³K₈ and ⁵G₆/⁵F₁ states of Ho³⁺ ions were studied in the range of 303-923 K. The result demonstrated that using the ratio between the blue luminescence intensities of Ho³⁺ ions, the sensitivity and the accuracy for optical thermometry achieved here are superior to the previously reported Er³⁺ green fluorescence based optical temperature sensors.