Li Tengfei, Wu Chuanguang, Yang Mingsheng, Li Bowen, Yan Xiaorong, Zhu Xiaoran, Yu Haiping, Hu Mingjun, Yang Jun
Center on Nanoenergy Research, School of Physical Science and Technology, Guangxi University, Nanning 530004, China.
Beijing Institute of Nanoenergy & Nanosystems, Chinese Academy of Sciences, Beijing 101400, China.
Langmuir. 2022 Feb 22;38(7):2287-2293. doi: 10.1021/acs.langmuir.1c02973. Epub 2022 Feb 11.
Carbon dots (CDs) with long-lived room-temperature phosphorescence (RTP) or long afterglow properties draw much attention. However, most room-temperature phosphorescent materials are metal containing, and the exploitation of long-lived color-tunable RTP materials faces great challenges. Here, we report metal-free boron-doped CDs (B-CDs) for room-temperature phosphorescence with tunable color and an ultralong lifetime. B-CDs were obtained by simply calcining a mixture of boric acid and 1,3,5-benzenetricarboxylic acid in the atmosphere. The as-prepared B-CDs were characterized through UV-vis spectroscopy, photoluminescence spectroscopy, and so forth. Under the excitation of 310 nm UV light, B-CDs show RTP that appears as blue with a phosphorescence lifetime of 1042 ms, and after switching the excited wavelength to 365 nm, the RTP appears as green with a phosphorescence lifetime of 590 ms. Due to the unique RTP properties, B-CDs display promising applications in anticounterfeiting and information encryption.
具有长寿命室温磷光（RTP）或长余辉特性的碳点（CDs）备受关注。然而，大多数室温磷光材料都含有金属，开发长寿命、颜色可调的RTP材料面临巨大挑战。在此，我们报道了用于室温磷光的无金属硼掺杂碳点（B-CDs），其颜色可调且寿命超长。通过在大气中简单煅烧硼酸和1,3,5-苯三甲酸的混合物获得B-CDs。通过紫外可见光谱、光致发光光谱等对所制备的B-CDs进行了表征。在310 nm紫外光激发下，B-CDs呈现出蓝色的RTP，磷光寿命为1042 ms，将激发波长切换到365 nm后，RTP呈现绿色，磷光寿命为590 ms。由于独特的RTP特性，B-CDs在防伪和信息加密方面显示出广阔的应用前景。
