Optical High Temperature Sensor Based on Enhanced Green Upconversion Emissions in Er3+–Yb3+–Li+ Codoped TiO2 Powders
Abstract:The Er3+–Yb3+–Li+ codoped TiO2 powders have been prepared by sol–gel method. The strong enhancement of green and red upconversion emissions were obtained for Er3+–Yb3+ codoped TiO2 by additional Li+ codoping and investigated using 976 nm semiconductor laser diode excitation. The enhanced upconversion emissions by the addition of Li+ resulted from the formation of Li compound with lower crystal field symmetry. The fluorescence intensity ratio (FIR) of green upconversion emissions from the transitions of 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 of Er3+ in the Er3+–Yb3+–Li+ codoped TiO2 has been studied as a function of temperature in the range of 300–925 K, and the maximum sensitivity was determined to be 0.0025 K−1. Er3+–Yb3+–Li+ codoped TiO2 material with the highest operating temperature up to 925 K, has higher temperature sensitivity and fluorescence efficiency being a promising candidate for applications in optical high temperature sensor.
Document Type: Research Article
Publication date: November 1, 2011
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