Abstract

Fluorescence intensity ratio thermometry based on hybrid ${\mathrm{Eu}}^{3+}$-doped ${\mathrm{GdVO}}_4$ and ${\mathrm{Cr}}^{3+}$-doped ${\mathrm{Al}}_2{\mathrm{O}}_3$ particles has been studied. We aim at overcoming the limitation that the relative sensitivity ($S_r$) decreases with the square of temperature owing to the thermal relation between the two emitting levels in one matrix in terms of the Boltzmann distribution law. The design of hybrid ${\mathrm{Eu}}^{3+}$-doped ${\mathrm{GdVO}}_4$ and ${\mathrm{Cr}}^{3+}$-doped ${\mathrm{Al}}_2{\mathrm{O}}_3$ particles constructs two emission bands with opposite temperature dependences. Furthermore, the $S_r$ makes a breakthrough by obtaining greater sensitivity in a high-temperature range; the maximum value obtained is $1.4\%{\mathrm{K}}^{-1}$ at 633 K.

© 2019 Optical Society of America

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