Synergistic use of Raman and photoluminescence signals for optical thermometry with large temperature sensitivity


In this work we demonstrate that large temperature sensitivity over a wider temperature range is possible by adopting the dual use of Raman and photoluminescence (PL) signals emitted by rare-earth doped crystalline phosphors when excited by a suitable laser light. We define Raman-PL-intensity ratio (RPIR) as an alternative thermometric parameter to define temperature sensitivity and exploited the contrasting effect of temperature on the intensities of the PL and Raman lines of a Eu3+-doped BaTiO3 ferroelectric phosphor and achieved large temperature tuning of color (red <-> blue/green) and large relative temperature sensitivities in a wide temperature range: +6.4 %K-1 at 65 K, +2.4 %K-1 at 303 K. Our strategy offers greater flexibility for the design of phosphor systems for optical thermometry with high sensitivity.



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De, A; Dwij, V; Sathe, V; Hernandez-Rodriguez, MA; Carlos, LD; Ranjan, R

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RR acknowledges the Science and Engineering Research Board, Department of Science and Technology, Govt. Of India for financial assistance (Grant No. EMR/2016/001457) . This work was partially developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by Por-tuguese funds through the Foundation for Science and Technology/MCTES. MAHR thanks the grant financed by the SusPhotoSolutions project (CENTRO-01-0145-FEDER-000005) and AD acknowledges the Department of Science and Technology (DST) , Government of India for the award of Inspire fellowship. Authors thank both the reviewers of this paper for their fruitful suggestions.

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