Ultraviolet phosphorescent carbon nanodots  

作　　者：Shi-Yu Song Kai-Kai Liu Qing Cao Xin Mao Wen-Bo Zhao Yong Wang Ya-Chuan Liang Jin-Hao Zang Qing Lou Lin Dong Chong-Xin Shan 

机构地区：[1]Henan Key Laboratory of Diamond Optoelectronic Material and Devices,Key Laboratory of Material Physics,Ministry of Education,School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Light(Science & Applications)》2022年第6期1274-1284,共11页光（科学与应用)（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(Grant Nos.U21A2070,62075198,and 11904326);the Henan Center for Outstanding Overseas Scientists(GZS201903).

摘　　要：Phosphorescent carbon nanodots(CNDs)have generated enormous interest recently,and the CND phosphorescence is usually located in the visible region,while ultraviolet(UV)phosphorescent CNDs have not been reported thus far.Herein,the UV phosphorescence of CNDs was achieved by decreasing conjugation size and in-situ spatial confinement in a NaCNO crystal.The electron transition from the P_(x) to the sp^(2) orbit of the N atoms within the CNDs can generate one-unit orbital angular momentum,providing a driving force for the triplet excitons population of the CNDs.The confinement caused by the NaCNO crystal reduces the energy dissipation paths of the generated triplet excitons.By further tailoring the size of the CNDs,the phosphorescence wavelength can be tuned to 348 nm,and the room temperature lifetime of the CNDs can reach 15.8 ms.As a demonstration,the UV phosphorescent CNDs were used for inactivating gram-negative and gram-positive bacteria through the emission of their high-energy photons over a long duration,and the resulting antibacterial efficiency reached over 99.9%.This work provides a rational design strategy for UV phosphorescent CNDs and demonstrates their novel antibacterial applications.

关 键 词：RATIONAL ULTRAVIOLET LIFETIME 

分 类 号：O43[机械工程—光学工程]