Advancing Beyond 800 Nm: Highly Stable Near‐Infrared Thermally Activated Delayed Lasing Triggered by Excited‐State Intramolecular Proton Transfer Process
Abstract
Abstract Near‐infrared (NIR) organic lasers have undergone rapid development in recent years, but still facing challenges in lowering the threshold and improving the stability. Herein, to overcome these challenges, a “two in one” strategy involving the integration of thermally activated delayed fluorescence (TADF) and excited‐state intramolecular proton transfer (ESIPT) activity in a single molecule is proposed. Specifically, a donor–acceptor–donor type TADF material 2,6‐bis[4‐(diphenylamino)phenyl]‐1,5‐dihydroxyanthraquinone (TPA‐DHAQ) with an ESIPT‐active moiety as the acceptor, is designed and synthesized, based on which, a NIR organic laser at 820 nm with an exceptionally low threshold of 6.3 µJ cm −2 can be realized. Benefiting from the synergistic effect of the TADF property and the ESIPT process, the resulting organic laser showed excellent stability by maintaining the laser intensity at ≈80% of the initial value after 580 min of continuous excitation. Finally, by modulating the size of the resonator, a single‐mode NIR laser is successfully realized. This work provides a novel molecular design strategy for the development of new TADF gain materials to overcome the problem of high threshold and poor stability of conventional NIR organic lasers, and shed light on the future development of NIR organic lasers.
Article Details
Authors (10)
Zong‐Lu Che
Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University 199 Ren'ai Road Suzhou Jiangsu 215123 P. R. China
You‐Jun Yu
Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University 199 Ren'ai Road Suzhou Jiangsu 215123 P. R. China
Chang‐Cun Yan
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu China
Shi‐Jie Ge
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu China
Peng Zuo
National Institute of Biological Sciences
Jun‐Jie Wu
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu China
Fu‐Ming Liu
Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University 199 Ren'ai Road Suzhou Jiangsu 215123 P. R. China
Zi‐Qi Feng
Institute of Functional Nano and Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon‐Based Functional Materials & Devices Soochow University 199 Ren'ai Road Suzhou Jiangsu 215123 P. R. China
Liang‐Sheng Liao
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu China
Xue‐Dong Wang
State Key Laboratory of Bioinspired Interfacial Materials Science Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University Suzhou Jiangsu China