Improved optical thermometry in Er³⁺:Y₂O₃ nanocrystals by re-calcination

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• 作者：Lu Liu ; Yujin Chen ; Xinlu Zhang ; Zhenguo Zhang ; Yuxiao Wang
• 关键词：Upconversion ; Temperature sensing ; Fluorescence intensity ratio ; Sensitivity
• 刊名：Optics Communications
• 出版年：15 November, 2013
• 年：2013
• 卷：309
• 期：Complete
• 页码：90-94
• 全文大小：1376 K

文摘

Variations of fluorescence intensity ratio of green upconversion emissions in Er³⁺:Y₂O₃ nanocrystals and their bulk counterpart have been studied as a function of temperature. In the temperature range of 323-773 K, the maximum sensitivity of about 0.003 K^鈭? is obtained in the samples synthesized by the conventional sol-gel method at 800 掳C. It is found that the upconversion emission is enhanced by a factor of about 56 after re-calcining the conventional samples at 1300 掳C. Besides that, the sensitivity is increased to the value of about 0.004 K^鈭?, and the sensing accuracy is also improved. With efficient upconversion luminescence, high degree of sensitivity and accuracy, Er³⁺ doped Y₂O₃ bulk counterpart show promising application in nanoscale thermal sensor.