Low-temperature optical thermometer based on the luminescence of the double perovskite Ba2MgWO6: Nd3+
Journal of Luminescence(2023)
Abstract
Here, we report Nd3+ - doped Ba2MgWO6 (BMW) as a potential remote luminescent thermometer, working over a wide operating temperature range up to 673 K. The crystal structure, morphology and luminescence of samples were characterized. The lifetime of Nd3+ 4F3/2 decreases from 0.55 ms to 0.46 ms when the content of Nd3+ increases caused by the cross-relaxation. The temperature sensing ability of Ba2MgWO6 was evaluated for the first time by applying the thermally coupled Nd3+ levels as well as based on the emissions ratio of Nd3+ ions and the host. An impressive maximum of relative sensitivity (Sr = 4.46%K−1 at 198 K) with very small uncertainty (δT=0.005K) working in 77–248 K was achieved for the sample BMW: 4%Nd3+. The results promote the BMW: Nd3+ double perovskite as a promising optical thermometer that can operate in a wide operating temperature, especially in the low – temperature range.
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Key words
Double perovskites,Neodymium,Luminescence,Relative sensitivity,Low-temperature optical thermometer
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