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Optical High Temperature Sensor Based on Enhanced Green Upconversion Emissions in Er3+–Yb3+–Li+ Codoped TiO2 Powders

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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 2H11/24I15/2 and 4S3/24I15/2 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.
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Document Type: Research Article

Publication date: 2011-11-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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