Jin Xilang, Zhao Huaqi, Bai Haiyan, Ding Liu, Chen Weixing
Engineering Research Center of Light Stabilizers for Polymer Materials, Universities of Shaanxi Province, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, Shaanxi Province 710021, PR China; Yulin Boyi-Jingking Research Institute of Industrial Technology Development Research, Yulin, Shaanxi Province 719054, PR China.
Engineering Research Center of Light Stabilizers for Polymer Materials, Universities of Shaanxi Province, School of Materials and Chemical Engineering, Xi'an Technological University, Xi'an, Shaanxi Province 710021, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Jan 15;305:123473. doi: 10.1016/j.saa.2023.123473. Epub 2023 Oct 6.
Facile synthesis of Ultralong room-temperature phosphorescence (URTP) with super stability and long-afterglow are of great significance, but hard to achieve. Herein, a brilliant gram-scale and solvent-free pyrolysis treatment strategy has been developed to prepare high-performance URTP carbon dots (CDs) by regulating different temperature (250-500 °C). The optimized CDs (CD-400) showed room-temperature phosphorescence 1.99 s and lasting over 22 s to naked eyes, which is superior to most of the reported URTP CDs. Owing to the stabilization effects of the modified BO layer on the surface, the homogenous distribution of CD-400 with the narrow diameter of 1.44 nm was constructed, displaying a superb stability through hydrogen-bond network. In addition, the doping atoms (N, O) greatly enhanced the n-π* transitions and stabilized triplet excitons radiative transitions, facilitating the effective intersystem crossing (ISC) and the RTP emissions. More importantly, the BO-modified CDs were successfully applied in the multi-level information encryption (time-resolved RTP performance) and fingerprint identification (bifurcation, whorl and termination details).
简便合成具有超高稳定性和长余辉的超长室温磷光（URTP）具有重要意义，但却难以实现。在此，我们开发了一种出色的克级且无溶剂的热解处理策略，通过调节不同温度（250 - 500°C）来制备高性能的URTP碳点（CDs）。优化后的碳点（CD - 400）在室温下的磷光时间为1.99秒，肉眼可见的持续时间超过22秒，优于大多数已报道的URTP碳点。由于表面改性的BO层的稳定作用，构建了直径为1.44纳米的窄直径且分布均匀的CD - 400，通过氢键网络展现出卓越的稳定性。此外，掺杂原子（N、O）极大地增强了n - π*跃迁并稳定了三重态激子的辐射跃迁，促进了有效的系间窜越（ISC）和室温磷光发射。更重要的是，BO改性的碳点成功应用于多级信息加密（时间分辨的室温磷光性能）和指纹识别（分叉、螺纹和终点细节）。
