Ambivalent photoluminescence thermometer based on rhodium cationic complex

Abstract

We report on the photoluminescent (Pl) thermometer based on a rhodium cationic complex (Rh-CC). We discovered that optical pumps by 350 nm and 523 nm cause the Pl centered at 720–735 nm. Cooling of the Rh-CC up to 243 K resulted in conventional linear growth of Pl intensity, providing 4.5 % K⁻¹ relative thermal sensitivity (S_r). Herein, heating of the Rh-CC by laser light leads to unconventional non-linear evolution of the Pl spectrum, attributing to the amorphous state and carbon Pl with 0.5 % K⁻¹ relative thermal sensitivity up to 484 K. The results, thereby, demonstrate an ambivalent behavior of new Pl thermometer operating at 240–500 K temperature range with comparable sensitivity.