Volume 116, Number 6, December 2016
|Number of page(s)||5|
|Published online||08 February 2017|
Origin of the deviation between the fluorescence intensity ratio of a thermally coupled level and the Boltzmann distribution law
1 Condensed Matter Science and Technology Institute, Harbin Institute of Technology - 150080 Harbin, China
2 School of Materials Science and Engineering, Harbin Institute of Technology - 150001 Harbin, China
3 Laboratory of Sono- and photo- theranostic Technology, Harbin Institute of Technology - 150001 Harbin, China
4 Department of Mathematics and Materials Research Institute, The Pennsylvania State University University Park, State College, 16082 PA, USA
Received: 10 November 2016
Accepted: 19 January 2017
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.
PACS: 07.20.Dt – Thermometers / 78.20.N- – Thermo-optic effects / 78.20.-e – Optical properties of bulk materials and thin films
© EPLA, 2016
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