题目：

Excited-State Intramolecular Proton Transfer Parent Core Engineering for Six-Level System Lasing Toward 900 nm

作者：

Chang-Cun Yan^1,#, Yan-Ping Liu^2,#, Wan-Ying Yang^1,#, Jun-Jie Wu¹, Xue-Dong Wang^1,*,and Liang-Sheng Liao^1,3,*

单位：

¹Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren’ai Road, Suzhou, 215123, Jiangsu (P. R. China)

²State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University Hangzhou, 310027, Zhejiang (P. R. China)

³Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau SAR (P. R. China)

摘要：

Organic molecules which can undergo excited-state intramolecular proton transfer (ESIPT) process have been considered as ideal gain materials for near-infrared organic lasers owing to their effective four-level systems. However, extending lasing wavelength beyond 800 nm with present ESIPT-active gain materials is still in challenge. Herein, we established a molecular design strategy that operates via extending the π-conjugated system of the ESIPT parent core to enhance the cascaded double ESIPT process and thus to achieve the red-shifted six-level system lasing. Concretely, a model molecule with 1,9-dihydroxyanthracene as the ESIPT parent core was designed and synthesized, which was proved to undergo twice cascaded ESIPT processes while the 1,8-dihydroxynaphthalene-based analogue can only undergo once ESIPT process based on DFT calculations and ultrafast dynamics analyses. Finally, a six-level system lasing toward 900 nm was achieved with a low threshold of 27.4 μJ cm⁻².

影响因子：

15.336

分区情况：

一区

链接：

https://onlinelibrary.wiley.com/doi/10.1002/anie.202210422