A highly sensitive ratiometric optical thermometer based on a Sr2MgWO6 double perovskite doped with Dy3+ exploiting thermally coupled and uncoupled levels

• Published in: Dalton transactions : an international journal of inorganic chemistry 2024-11
• Main Authors: Vu, Thi Hong Quan, Bondzior, Bartosz, Stefańska, Dagmara, Dan, Shovan, Dereń, Przemysław Jacek
• Format: Article
• Language: English
• ISSN: 1477-9234; 1477-9234
• DOI: 10.1039/d4dt02940b

The increasing demand for highly sensitive optical thermometers operating within a wide temperature range necessitates the development of new phosphors. In this work, the potential temperature sensing performance of a novel yellow-emitting phosphor, Sr2MgWO6 double perovskite, doped with varying concentrations of Dy3+ was investigated for the first time. Increasing the concentration of Dy3+ from 0% to 7% shifted the color of luminescence from blue to yellowish-orange within the CIE1931 color space. The energy transfer efficiency from (WO6)6- to Dy3+ also increased significantly to 98.4%. Moreover, the sample doped with 3% Dy3+ showed the highest emission intensity, with a concentration beyond this threshold inducing concentration quenching. This phenomenon was primarily governed by dipole-dipole interactions. The highest quantum yield was found to be 30.7% for the sample doped with 3% Dy3+. Upon 266 nm wavelength excitation, the temperature sensing ability of the samples doped with 3%, 5%, and 7% Dy3+ was examined based on the fluorescence intensity ratio between the thermally coupled and uncoupled levels. It showed that the relative thermal sensitivity of Sr can be tuned by changing the Dy3+ concentration. Sr-max = 3.24% K-1 was obtained for the sample doped with 3% Dy3+ at 193 K within the 80-273 K operating range for thermally uncoupled levels. For thermally coupled levels, the Sr-max value reached 1.35% K-1 at 333 K for the sample doped with 7% Dy3+ in the range of 293-593 K. These results demonstrate the enormous potential of the studied materials for thermal sensing applications.The increasing demand for highly sensitive optical thermometers operating within a wide temperature range necessitates the development of new phosphors. In this work, the potential temperature sensing performance of a novel yellow-emitting phosphor, Sr2MgWO6 double perovskite, doped with varying concentrations of Dy3+ was investigated for the first time. Increasing the concentration of Dy3+ from 0% to 7% shifted the color of luminescence from blue to yellowish-orange within the CIE1931 color space. The energy transfer efficiency from (WO6)6- to Dy3+ also increased significantly to 98.4%. Moreover, the sample doped with 3% Dy3+ showed the highest emission intensity, with a concentration beyond this threshold inducing concentration quenching. This phenomenon was primarily governed by dipole-dipole interactions. The highest quantum yield was found to be 30.7% for the sample dope