Qi Hetong, Cui Xiaofeng, Zhang Hengqi, Tong Yuxi, Qian Manping, Zhou Wenshuai, Ding Shujiang, Qi Honglan
School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
School of Future Technology, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Chem Asian J. 2023 Mar 14;18(6):e202201284. doi: 10.1002/asia.202201284. Epub 2023 Feb 13.
We report the rational design of the matrix-free carbon dots (C-dots) with long wavelength and wavelength-tunable room-temperature phosphorescence (RTP). Taking advantage of microwave-assisted heating treatment, three RTP C-dots in boric acid (BA) composites are synthesized by using diethylenetriaminepentakis (methylphosphonic acid) as a multiple-sites crosslink agent, a moderately acid catalyst and P source; phenylenediamines (either o-PD, m-PD, or p-PD, respectively) as building block while BA as a carbonization-retardant matrix. After the water-soluble BA matrix is removed by dialysis, three matrix-free C-dots are obtained with RTP emission at 540, 550 and 570 nm under an excitation wavelength of 365 nm. Alterations of RTP emission of three matrix-free C-dots are ascribed to the difference in their particle size and band gap from n-π* transition. Furthermore, the application of three matrix-free C-dots are successfully performed in information encryption and decryption.
我们报道了具有长波长和波长可调室温磷光（RTP）的无基质碳点（C-点）的合理设计。利用微波辅助加热处理，以二乙烯三胺五（甲基膦酸）作为多位点交联剂、适度的酸催化剂和磷源；分别以邻苯二胺（o-PD）、间苯二胺（m-PD）或对苯二胺（p-PD）作为结构单元，同时以硼酸（BA）作为碳化阻滞剂基质，合成了三种硼酸复合材料中的RTP C-点。通过透析去除水溶性BA基质后，得到了三种无基质C-点，在365nm激发波长下，它们在540、550和570nm处有RTP发射。三种无基质C-点的RTP发射变化归因于它们的粒径和n-π*跃迁带隙的差异。此外，三种无基质C-点成功地应用于信息加密和解密。
