Deep-blue thermally activated delayed fluorescence carbon dots with ultralong lifetime. Issue 7 (25th January 2023)

• Record Type: Journal Article
• Authors: Jie, Yanni; Wang, Dong; Chen, Runfeng; Zhang, Jingyu; Li, Wenqi; Huang, Jianfeng; Dai, Penggao; Gao, Yang; Li, Fuchun; Fang, Jiawen
• Is Part Of: Nanoscale. Volume 15:Issue 7(2023)
• Page Start: 3337
• Page End: 3344
• Publication Date: 2023-01-25
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr05104d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Deep blue thermally activated delayed fluorescence of carbon dots with lifetime up to 2.02 s, which the longest, has been achieved. Abstract : Carbon dots (CDs) with deep-blue thermally activated delayed fluorescence (TADF) of more than 2 s were developed, exhibiting the longest lifetime to date. In contrast to the established deep-blue TADF systems, this developed CD-based system (BNCDs) could be facilely and effectively synthesized, and more impressively, the emission lasted for more than 16 s (to the naked eye). XRD, TEM, FT-IR, and XPS analyses were conducted, and structural characterizations indicated that the CDs formed hydrogen bonding with B2 O3 . The temperature-dependent photoluminescence (PL) spectra demonstrated the existence of thermally activated delayed fluorescence in the composite. Further studies revealed that the B2 O3 matrix restricted the vibration and rotation of CD chromophores and suppressed the non-radiative recombination of triplet excitons. Last but not least, potential applications in bioimaging, anti-counterfeiting, and information encryption were also explored. This work can provide new insights for developing metal-free and ultralong lifetime afterglow materials.