Liu Bo-Mei, Lin Yue, Liu Yingchun, Lou Bibo, Ma Chong-Geng, Zhang Hui, Wang Jing
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, China.
Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry, Sun Yat-sen University, Guangzhou, China.
Light Sci Appl. 2024 Oct 10;13(1):286. doi: 10.1038/s41377-024-01635-7.
Materials capable of dynamic persistent luminescence (PersL) within the visible spectrum are highly sought after for applications in display, biosensing, and information security. However, PersL materials with eye-detectable and excitation-wavelength-dependent characteristics are rarely achieved. Herein, a nonstoichiometric compound CaGaO:Bi (x < 2) is present, which demonstrates ultra-long, color-tunable PersL. The persistent emission wavelength can be tuned by varying the excitation wavelength, enabling dynamic color modulation from the green to the orange region within the visible spectrum. Theoretical calculations, in conjunction with experimental observations, are utilized to elucidate the thermodynamic charge transitions of various defect states, thereby providing insights into the relationship between Bi emitters, traps, and multicolored PersL. Furthermore, the utility of color-tunable PersL materials and flexible devices is showcased for use in visual sensing of invisible ultraviolet light, multicolor display, information encryption, and anti-counterfeiting. These discoveries create new opportunities to develop smart photoelectric materials with dynamically controlled PersL for various applications.
能够在可见光谱范围内实现动态持续发光（PersL）的材料在显示、生物传感和信息安全等应用中备受追捧。然而，具有人眼可检测且依赖激发波长特性的持续发光材料却很少见。在此，我们发现了一种非化学计量化合物CaGaO:Bi（x < 2），它展现出超长的、颜色可调的持续发光。通过改变激发波长可以调节持续发射波长，从而在可见光谱范围内实现从绿色到橙色区域的动态颜色调制。结合理论计算和实验观察，我们阐明了各种缺陷态的热力学电荷跃迁，进而深入了解Bi发射体、陷阱与多色持续发光之间的关系。此外，还展示了颜色可调的持续发光材料及其柔性器件在无形紫外光视觉传感、多色显示、信息加密和防伪方面的应用。这些发现为开发具有动态可控持续发光的智能光电材料以用于各种应用创造了新的机会。
