Liu Yang, Zheng Chengyu, Yang Bai
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P.R. China.
Langmuir. 2022 Jul 12;38(27):8304-8311. doi: 10.1021/acs.langmuir.2c00738. Epub 2022 Jun 30.
Visible spectral afterglow materials offer unprecedented potential for a myriad of applications due to their long luminescence characteristics, but it is still insufficient to prepare matrix-free materials with multicolor afterglow including the blue color. In this study, we successfully developed phosphorus and nitrogen codoped carbonized polymer dots (CPDs) with multicolor room temperature phosphorescence (RTP) including the blue color by microwave-assisted chemical reactions under different reaction time. After ceasing UV light, all four prepared CPDs were able to emit vivid RTP with a maximum absolute phosphorescence quantum yield (QY) of 59.41% and a maximum lifetime of about 1 s (yellow CPDs). With the increase of microwave reaction time, the RTP color of CPDs showed a gradual blue shift from yellow to blue. The reason why the RTP color of CPDs showed a gradual blue shift was the decrease of C═O units as the extension of the microwave reaction time. In view of their fascinating multicolor RTP properties, potential applications of the four CPDs in the field of anticounterfeiting painting were presented and demonstrated. This work would inspire other researchers to enrich multicolor afterglow materials.
可见光谱余辉材料因其长发光特性在众多应用中具有前所未有的潜力，但制备包括蓝色在内的多色无基质余辉材料仍存在不足。在本研究中，我们通过不同反应时间的微波辅助化学反应，成功开发出具有包括蓝色在内的多色室温磷光（RTP）的磷氮共掺杂碳化聚合物点（CPD）。停止紫外光照射后，所有制备的四种CPD都能够发出鲜艳的RTP，最大绝对磷光量子产率（QY）为59.41%，最长寿命约为1秒（黄色CPD）。随着微波反应时间的增加，CPD的RTP颜色呈现出从黄色到蓝色的逐渐蓝移。CPD的RTP颜色逐渐蓝移的原因是随着微波反应时间的延长，C═O单元减少。鉴于其迷人的多色RTP特性，展示并论证了这四种CPD在防伪涂料领域的潜在应用。这项工作将激励其他研究人员丰富多色余辉材料。
