Self‐Calibrated Thermometer and Dynamic Anti‐Counterfeiting Based on YNbO<sub>4</sub>:Pr<sup>3+</sup> Luminescent Material
Yuqi Chen, Fangyi Zhao, Kangrui Qiang, Qinan Mao, Heyi Yang, Yiwen Zhu, Meijiao Liu, Jiasong Zhong
Abstract
Abstract Phosphors with multifunctional applications have attracted extensive research, especially in thermometer and anti‐counterfeiting fields. Herein, a series of Pr 3+ ‐doped YNbO 4 (YNO) phosphors with adjustable photoluminescence and red persistent luminescence (PersL) performances are developed. YNO host exhibits the blue self‐activated luminescence, and the different Pr 3+ emission peaks possess various thermal stability properties due to the thermal quenching channel generated by the intervalence charge transfer state between Pr 3+ and Nb 5+ ions. Two kinds of fluorescence intensity ratio models with high absolute and relative sensitivities are realized to measure the temperature under dual‐wavelength excitation. Moreover, YNO:Pr 3+ exhibits the red PersL with a duration of about 120 s upon ceasing the UV excitation light source. The fabricated YNO:Pr 3+ ‐polydimethylsiloxane films display different luminescence patterns with the passage of time after turning off UV light, which can cleverly achieve dynamic conversion. These results demonstrate that YNO:Pr 3+ phosphor has potential applications in dual‐wavelength excited thermometry and dynamic anti‐counterfeiting fields.