Materials exhibiting long-lived, persistent luminescence in the visible spectrum are useful for applications in the display, information encryption and bioimaging sectors1,2,3,4. Herein, we report the development of several organic phosphors that provide colour-tunable, ultra-long organic phosphorescence (UOP). The emission colour can be tuned by varying the excitation wavelength, allowing dynamic colour tuning from the violet to the green part of the visible spectrum. Our experimental data reveal that these organic phosphors can have an ultra-long lifetime of 2.45 s and a maximum phosphorescence efficiency of 31.2%. Furthermore, we demonstrate the applications of colour-tunable UOP for use in a multicolour display and visual sensing of ultraviolet light in the range from 300 to 360 nm. The findings open the opportunity for the development of smart luminescent materials and sensors with dynamically controlled phosphorescence.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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This work is supported by the National Natural Science Foundation of China (21875104, 51673095, 91833304, 91833302 and 61605074), National Basic Research Program of China (973 Program, No. 2015CB932200), Natural Science Fund for Distinguished Young Scholars of Jiangsu Province (BK20180037), the Natural Science Fund for Colleges and Universities (17KJB430020) of Jiangsu Province, and Nanjing Tech Start-up Grant (3983500158 and 3983500169). We are grateful to the High Performance Computing Center of Nanjing Tech University for technical support.
The authors declare no competing interests.
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Gu, L., Shi, H., Bian, L. et al. Colour-tunable ultra-long organic phosphorescence of a single-component molecular crystal. Nat. Photonics 13, 406–411 (2019). https://doi.org/10.1038/s41566-019-0408-4
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