Highly sensitive optical thermometer of Sm <sup>3+</sup> , Mn <sup>4+</sup> activated LaGaO <sub>3</sub> phosphor for the regulated thermal behavior
Ziyang Li, Xue Yu, Ting Wang, Shaoqing Wang, Longchao Guo, Zhenzhen Cui, Guilong Yan, Wei Feng, Feng Zhao, Jiaqi Chen, Xuhui Xu, Jianbei Qiu
Abstract
Abstract Sm 3+ , Mn 4+ co‐activated LaGaO 3 phosphors, giving the characteristic emissions of orange and red emission simultaneously, were prepared by a solid‐state reaction. Their luminescence properties, energy transfer behavior, thermal stability, and ratiometric temperature sensing performance were investigated. Thanks to the inhibition of energy transfer between Sm 3+ and Mn 4+ ions at high temperature and the reconstruction of the traps, the distinct optical behavior of the involved activators dependent on the ambient temperature was evaluated. Anti‐thermal quenching performance of Sm 3+ ions along with the emission declination of Mn 4+ ions was observed. Hence, the optical thermometry characteristics of the resultant phosphor based on the fluorescent intensity ratio (orange/red) realize a recorded temperature sensitivity of 4.19% K −1 and 2.09% K −1 . Moreover, the as‐explored film combined with the LaGaO 3 : Sm 3+ , Mn 4+ phosphor is demonstrated to be a promising multi‐color optical thermometer.