磷光
同步
材料科学
光电子学
二极管
纳米点
磷光有机发光二极管
亮度
光学
荧光粉
发光二极管
量子效率
荧光
电致发光
闪烁
碳纤维
可见光谱
有机发光二极管
色温
并五苯
白光
作者
Xiangyu Li,Si-Tao Liu,Qing Cao,Shi-Yu Song,Mengdi Gao,Chaojun Gao,Wenshuo Zhang,Wen-Bo Zhao,Chongxin Shan,Kai-Kai Liu
出处
期刊:Nano Letters
[American Chemical Society]
日期:2025-12-11
卷期号:25 (51): 17937-17945
标识
DOI:10.1021/acs.nanolett.5c05349
摘要
White phosphorescent materials are highly desirable for delayed lighting and advanced display applications; however, their development is hindered by time-dependent spectral changes and low efficiency. Herein, we report bright and long-lived white phosphorescence from carbon nanodots (CNDs) achieved by synchronizing excited-state lifetime engineering yielding white phosphorescent CNDs with a lifetime of 800 ms and a quantum efficiency of 27.9%. A secondary carbonization strategy synchronizes multiple emission centers, enabling stable white phosphorescence over 6 s, tunable correlated color temperature (4400-7990 K), and CIE coordinates (0.29, 0.32) to (0.36, 0.34). Moreover, integration of these CNDs into a light emitting diode (LED) demonstrates delayed white emission with suppressed flicker under alternating-current excitation, providing eye-friendly illumination. Programmable delayed LED arrays reconstruct temporally fragmented signals into coherent images. This work demonstrates a robust strategy for bright and long-lasting white phosphorescent materials, laying the foundation for advanced delayed lighting and programmable display applications.
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