Down-conversion luminescence and temperature sensing characteristics of LaSrGaO4:Er3+ |
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Authors: | Mimeng Liu Qinshan Li Qiang Ma Jinlong Shi Chong Wen Zhenhua Xing Jinxin Zhao Zhijun Wang Dawei Wang Panlai Li |
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Institution: | 1. National-Local Joint Engineering Laboratory of New Energy Photoelectric Devices, Hebei Key Laboratory of Optic-electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding, China;2. Hebei Key Laboratory of Semiconductor Lighting and Display Critical Materials, Baoding, China |
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Abstract: | Erbium(III) ion (Er3+) has abundant energy levels that can emit light covering a quite broad wavelength range in many hosts. Here we synthesized LaSrGaO4:Er3+ phosphors by a high-temperature solid-state method. Upon excitation at the ultraviolet (UV) band, LaSrGaO4:Er3+ phosphors could emit green, red and near-infrared emission simultaneously. The temperature dependent emission characteristics of the as-prepared samples was then studied and two kinds of luminescent ratiometric thermometry were constructed. The first one is on the basis of two green emission bands that stems from the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+. The intensity ratio between these two emission bands was found to follow well with the Boltzmann distribution, and its maximum relative sensitivity was calculated to be 0.84% K−1 at 299 K. The other one depends on the 4F9/2 → 4I15/2 transition of Er3+ and self-luminescence of the host LaSrGaO4, considering that these two emission lines have different temperature response. The relative sensitivity of this type of luminescence intensity ratio (LIR) thermometry could reach 1.86% K−1 at 299 K, we have successfully developed materials with one of the largest relative sensitivities to date, which provides some basis for the subsequent development of a new type of non-contact temperature sensor. |
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Keywords: | energy transfer LaSrGaO4:Er3+ relative sensitivity |
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