Origin of the deviation between the fluorescence intensity ratio of a thermally coupled level and the Boltzmann distribution law

Feng Qin, Hua Zhao, Wei Cai, Zhiguo Zhang, Wenwu Cao

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The temperature dependence of the fluorescence intensities of the thermally coupled pairs of some typical rare-earth ions was studied. The fluorescence intensity ratios (FIRs) of the thermally coupled pairs increased exponentially with increasing temperature. However, except for Er3+ and Nd3+, the FIRs of other rare-earth ions exhibited significant deviation from the Boltzmann distribution law. We suppose the deviation originates from the non-thermal population in the upper level of the coupled pairs. The temperature dependence of the deviation is discussed. Eliminating the deviation is beneficial for the development of FIR thermometry; only by clearly understanding the deviation can we eliminate it.

Original languageEnglish (US)
Article number60008
Issue number6
StatePublished - Dec 2016


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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