Long-lived fluorinated boron-nitride dots exhibiting room-temperature phosphorescence and high-temperature resistance

Matrix- and metal-free phosphorescence materials with long room-temperature lifetime and high-temperature phosphorescence properties have attracted tremendous attention but seldom reported. Herein, a universal fluorination strategy was proposed to obtain a series of matrix-free fluorinated boron nitride dots (F-BNDs) with markedly extended lifetime by constructing rigid F-induced hydrogen-bond networks. Miraculously, when the F-BNDs(e) were heated to 150 °C, the afterglow was temperature-controlled and still maintained with a lifetime as long as 0.25 s. In terms of their interesting phosphorescence properties, this work actually provides a guiding strategy to realize F-BND phosphorescence materials with time-resolved and temperature-controlled lifetime encoding characteristics. Widespread applications in higher-level information encryption, time-resolved information displaying, dynamic multidimensional anti-counterfeiting and colorless security ink were demonstrated.