An All-Optical Ratiometric Thermometer Based on Reverse Thermal Response from Interplay among Diverse Emission Centers and Traps with High-Temperature Sensitivity

• Published in: Industrial & engineering chemistry research Vol. 58; no. 47; pp. 21242 - 21251
• Main Authors: Lv, Yang, Jin, Yahong, Wu, Haoyi, Liu, Dong, Xiong, Guangting, Ju, Guifang, Chen, Li, Hu, Yihua
• Format: Journal Article
• Language: English
• Published: American Chemical Society 27.11.2019
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.9b05286

The use of noninvasive and rapid responsive spectroscopy coupled to potential applications under harsh conditions has led to an increased interest in all-optical ratiometric thermometers. In this work, we report on a novel all-optical ratiometric thermometer made of Ca8BaCe­(PO4)7:Mn2+, trap-mediated red emission of Mn2+ displayed antithermal quenching in the room-temperature (RT)–573 K range for a Mn2+ content of 0.05. The blue emission of Ce3+ weakens rapidly at elevated temperature, thereby leading to an increased discriminability of fluorescence intensity and a good temperature sensitivity. The maximum fluorescence and lifetime-based relative sensitivity are ∼2.17% K–1 and 5.14% K–1. The insight of interplay among diverse emission centers and traps is revealed. Moreover, the color of the emissions changes between yellow and red with temperature variations when Eu2+ ions are doped into Ca8BaCe­(PO4)7:Mn2+. The highly sensitive self-calibrated optical thermometer shows great promise with safety anticounterfeiting applications.