Room-temperature phosphorescence (RTP) carbon dots (CDs) are highly promising for optoelectronic applications but typically rely on external matrices to achieve high efficiency and long-lived emission. Herein, we address this limitation by designing matrix-free self-protected RTP CDs (CDsT) via one-step hydrothermal treatment of a polymer, poly(acrylamide-co-N-acryloylcarbazole). Such molecular design affords a dual-enhancement mechanism. Specifically, nitrogen atoms strengthen spin-orbit coupling, thereby facilitating intersystem crossing and efficient population of triplet excitons. Meanwhile, extensive hydrogen bonding between amide and amino groups restricts the intramolecular motions, significantly suppressing the nonradiative decay. Consequently, the cross-linked CDs exhibit blue fluorescence and bright green RTP. Elevating the reaction temperature from 120 to 220 °C progressively enriches C═N–C and C═O functional groups, which remarkably prolongs the phosphorescence lifetime from 446 to 761 ms. These optical properties provide possible promise in 3D dynamic information encryption and time-delayed ligh-emitting diodest, providing a new paradigm for designing advanced self-protective RTP nanomaterials.
Room-temperature phosphorescence (RTP) has attracted considerable attention in optical security, information protection, and environmental sensing. However, achieving efficient RTP remains challenging due to the spin-forbidden nature of triplet transitions and the high susceptibility of triplet excitons to environmenta...
Lu-Qing Zhai, Jia-Ru Shi, Rui-Xi Wang et al.· Chemical Communications· 0 citations
Carbon dots (CDs) represent a rapidly advancing class of fluorescent nanomaterials. Due to the dominant nonradiative decay channels of the triplet excited state of CDs, these materials generally exhibit no observable phosphorescence (PH) or delayed fluorescence. Here, we report the development of a sustainable and effi...
A. C. W. W. M. N. Peshala Koswatta, Thilini Upeksha Senevirathnage, Gomathi Vinayakam Mageswari et al.· ACS Omega· 0 citations
Carbon dots (CDs), an emerging class of carbon-based nanophosphors, have been regarded as ideal candidates for realizing long-afterglow room-temperature phosphorescence (RTP) owing to their exceptional optical properties, low cost, low toxicity, and high stability. In this study, three room-temperature phosphorescent c...
Yu-Hua Wang, Zi-Jie Wang, Han-Jun Liu et al.· Spectrochimica Acta Part A -...· 0 citations
Carbon dots (CDs) have emerged as promising room-temperature phosphorescence (RTP) materials for advanced anti-counterfeiting and encryption applications owing to their tunable emission and favorable biocompatibility. However, the simultaneous realization of multicolor phosphorescence, long lifetime, and dynamic color...
Kehan Zhang, Haidong Jin, Shenghui Li et al.· Spectrochimica Acta Part A -...· 0 citations
Room temperature phosphorescence (RTP) materials derived from sustainable resources are highly desirable but remain challenging due to the intrinsic instability of triplet excitons under ambient conditions. Herein, a biobased RTP system is reported by selectively integrating chlorogenic acid-derived carbon dots (CDs) i...
Flexible room-temperature phosphorescence (RTP) materials hold great promise for a wide range of optical applications. However, the strong interdependence between luminescent and mechanical properties severely hampers further advances in this field. Herein, we report a γ-cyclodextrin (γ-CD)-based host-guest encapsulati...
Ming Chen, Chun-Chao Zhang, Yan-Yang Wang et al.· Angewandte Chemie· 0 citations
We use cookies to run the site and, with your consent, for analytics and to show ads.
See our Cookie Policy.
