Tao Ye, Tang Lele, Wei Qi, Jin Jibiao, Hu Wenbo, Chen Runfeng, Yang Qingqing, Li Huanhuan, Li Ping, Xing Guichuan, Fan Quli, Zheng Chao, Huang Wei
Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing 210023, China.
Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau 999078, China.
Research (Wash D C). 2020 Dec 1;2020:2904928. doi: 10.34133/2020/2904928. eCollection 2020.
Organic ultralong room-temperature phosphorescence (OURTP) with a long-lived triplet excited state up to several seconds has triggered widespread research interests, but most OURTP materials are excited by only ultraviolet (UV) or blue light owing to their unique stabilized triplet- and solid-state emission feature. Here, we demonstrate that near-infrared- (NIR-) excitable OURTP molecules can be rationally designed by implanting intra/intermolecular charge transfer (CT) characteristics into H-aggregation to stimulate the efficient nonlinear multiphoton absorption (MPA). The resultant upconverted MPA-OURTP show ultralong lifetimes over 0.42 s and a phosphorescence quantum yield of ~37% under both UV and NIR light irradiation. Empowered by the extraordinary MPA-OURTP, novel applications including two-photon bioimaging, visual laser power detection and excitation, and lifetime multiplexing encryption devices were successfully realized. These discoveries illustrate not only a delicate design map for the construction of NIR-excitable OURTP materials but also insightful guidance for exploring OURTP-based nonlinear optoelectronic properties and applications.
具有长达数秒的长寿命三重激发态的有机超长效室温磷光（OURTP）引发了广泛的研究兴趣，但由于其独特的稳定三重态和固态发射特性，大多数OURTP材料仅由紫外线（UV）或蓝光激发。在此，我们证明，通过将分子内/分子间电荷转移（CT）特性植入H-聚集体中以刺激有效的非线性多光子吸收（MPA），可以合理设计近红外（NIR）可激发的OURTP分子。所得的上转换MPA-OURTP在UV和NIR光照射下均显示出超过0.42 s的超长寿命和约37%的磷光量子产率。借助非凡的MPA-OURTP，成功实现了包括双光子生物成像、视觉激光功率检测与激发以及寿命复用加密设备在内的新型应用。这些发现不仅为构建近红外可激发的OURTP材料提供了精细的设计蓝图，也为探索基于OURTP的非线性光电特性及应用提供了深刻的指导。
