@article{45b89b708e4342f1ab0cc871f532f62f,
title = "Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo(p-phenylene)s",
abstract = "Frequency-upconverted fluorescence and stimulated emission induced by multiphoton absorption (MPA) have attracted much interest. As compared with low-order MPA processes, the construction of high-order MPA processes is highly desirable and rather attractive, yet remains a formidable challenge due to its inherent low transition probability. We report the observation of the first experimental frequency-upconverted fluorescence and stimulated emission by simultaneous six-photon excitation in an organic molecular system. The well-designed organic conjugated system based on cross-shaped spiro-fused ladder-type oligo(p-phenylene)s (SpL−z, z=1–3) manifests reasonably high MPA cross-sections and brilliant luminescence emission simultaneously. The six-photon absorption cross-section of SpL-3 with an extended π-conjugation was evaluated as 8.67×10−169 cm12 s5 photon−5. Exceptionally efficient 2- to 6-photon excited stimulated emission was achieved under near-infrared laser excitation.",
keywords = "frequency-upconverted stimulated emission, MPA cross-section, multiphoton absorption (MPA), oligo(p-phenylene)s, spiro-fused molecules",
author = "Yi Jiang and Li, {King Fai} and Kun Gao and He Lin and Tam, {Hoi Lam} and Liu, {Yuan Yuan} and Yu Shu and Ka-Leung Wong and Lai, {Wen Yong} and Cheah, {Kok Wai} and Wei Huang",
note = "Funding Information: The authors acknowledge financial support from the National Natural Science Foundation of China (21835003, 91833304, 21422402, 21674050), the National Key Basic Research Program of China (2017YFB0404501, 2014CB648300), the Natural Science Foundation of Jiangsu Province (BE2019120), Program for Jiangsu Specially-Appointed Professor (RK030STP15001), the Six Talent Peaks Project of Jiangsu Province (TD-XCL-009), the 333 Project of Jiangsu Province (BRA2017402), the NUPT ?1311 Project? and Scientific Foundation (NY218164, NY217169), the Leading Talent of Technological Innovation of National Ten-Thousands Talents Program of China, the Excellent Scientific and Technological Innovative Teams of Jiangsu Higher Education Institutions (TJ217038), the Synergetic Innovation Center for Organic Electronics and Information Displays, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD, YX030003). Funding Information: The authors acknowledge financial support from the National Natural Science Foundation of China (21835003, 91833304, 21422402, 21674050), the National Key Basic Research Program of China (2017YFB0404501, 2014CB648300), the Natural Science Foundation of Jiangsu Province (BE2019120), Program for Jiangsu Specially‐Appointed Professor (RK030STP15001), the Six Talent Peaks Project of Jiangsu Province (TD‐XCL‐009), the 333 Project of Jiangsu Province (BRA2017402), the NUPT “1311 Project” and Scientific Foundation (NY218164, NY217169), the Leading Talent of Technological Innovation of National Ten‐Thousands Talents Program of China, the Excellent Scientific and Technological Innovative Teams of Jiangsu Higher Education Institutions (TJ217038), the Synergetic Innovation Center for Organic Electronics and Information Displays, and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD, YX030003). Publisher Copyright: {\textcopyright} 2021 Wiley-VCH GmbH",
year = "2021",
month = apr,
day = "26",
doi = "10.1002/anie.202100542",
language = "English",
volume = "60",
pages = "10007--10015",
journal = "Angewandte Chemie. International Edition",
issn = "1433-7851",
publisher = "John Wiley & Sons Ltd.",
number = "18",
}