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Dual-Responsive Thermally Activated Delayed Fluorescence of Spiropyran Derivatives

CCS Chemistry 2022年第6期4卷 2080-2089页

作者： Liangwei Ma Guanghui Wang Bingbing Ding Xiang Ma Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237

For the first time,a series of photochromic dyes SP1-3 with dual-responsive thermally activated delayed fluorescence(TADF)characteristics were reported in this *** from the reversible light-responsive property of SP1-3,the eigen TADF of these compounds could be regulated between 588 and 678 nm or turned on/off by different wavelengths of light irradiation in a polyvinylpyrrolidone(PVP)*** emission lifetime of the spiropyran derivative was prolonged to millisecond level for the first ***,the delayed fluorescence of SP1 and SP3 could also be manipulated by mechanical force because of the mechanochromistic properties of SP1 and *** research is a significant breakthrough for photochromic materials and may broaden its scope.

关键词： photochromism spiropyran mechanochromism TADF long-lived emission

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Photon Upconversion Afterglow material toward Visual Information Coding/Decoding

Photon Upconversion Afterglow material toward Visual Informa...

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中国稀土学会2020学术年会暨江西(赣州)稀土资源绿色开发与高效利用大会

作者： Xinxin Han Enhai Song Yayun Zhou Tao Hu Zhiguo Xia Qinyuan Zhang State Key Laboratory of Luminescent Materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques South China University of Technology Key Lab of Featured Metal Resources Utilization and Advanced Materials Development Nano and Energy Research Center School of Physics Guangxi University

The development of luminescent material with visual afterglow plays a crucial role in information ***,a long-lived phosphor KCaF:Yb,Mnwith visualized photon upconversion (UC) afterglow is *** UC emission spectrum consists of a high color purity (～99.33%) yellow emission band peaking at～570 nm,and the UC afterglow signal can be observed by naked eye in both bright and dark fields even at a high temperature of 200℃.Moreover,the demonstration background and pigments have little influence on the UC afterglow *** density functional theory (DFT) calculations and the up-/down-conversion luminescence characteristics suggest that the UC afterglow is originated from the long-lived exchange coupled Yb-Mndimers formed in KCaF:Yb,Mn,which is independent on the conventional"afterglow trap".The random distribution characteristics of Mn,and the oxygen ion (O) introduced by Ybnon-equivalent doping are the key factors for forming the efficient UC emission center in this *** the photon UC afterglow phosphor in screen printing ink,a visualized information encoding/decoding prototype suitable for both human and machine fast identification is demonstrated.

关键词： Mn2+ upconversion long-lived emission anti-counterfeiting information encryption

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