Dual sensitivity of spiropyran-functionalized carbon dots for full color conversions

作     者：Lin Ai Huimin Liu Rui Liu Haoqiang Song Ziqi Song Mingjun Nie Geoffrey I.N.Waterhouse Siyu Lu 

作者机构：Green Catalysis CenterCollege of ChemistryZhengzhou UniversityZhengzhou 450000China College of Chemistry and Chemical EngineeringJishou UniversityJishou 416000China School of Chemical SciencesThe University of AucklandAuckland 142New Zealand 

出 版 物：《Science China Chemistry》 (中国科学（化学英文版）)

年 卷 期：2022年第65卷第11期

页      面：2274-2282页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China(52122308,21905253,51973200,52103239) the Natural Science Foundation of Henan(202300410372) Henan Postdoctoral Foundation funding support from the MacDiarmid Institute for Advanced Materials Nanotechnology and the Dodd-Walls Centre for Photonic and Quantum Technologies 

主　　题：carbon dots dual-sensitivity full color emission spiropyran F?rster resonance energy transfer 

摘      要：Multicolor phosphors that respond rapidly to external stimuli are highly desirable for many applications, including lighting,optical displays and sensors. Herein, spiropyran(SP)-functionalized carbon dots(CDs) were synthesized with a broad-spectrum output that were responsive to both ultraviolet(UV)/visible light and pH. The SP-CDs possessed strong ester linkages between the UV-absorbing/blue-emitting CDs and blue-absorbing/red-emitting surface SP groups, allowing efficient F?rster resonance energy transfer(FRET) between the donor and acceptor. UV irradiation or acid addition cause the SP ring opening to merocyanine(MC) or protonated MCH+forms, respectively, together with the formation of sheet-like aggregates. These processes enhanced the red emissions by the SP groups and attenuated blue emissions from the CDs. These changes were fully reversible under visible light or basic conditions, respectively, allowing dynamic regulation of the fluorescence properties(emission colors from blue to red, photoluminescence(PL) intensity) under photoirradiation on the timescale of minutes. As proof-of concept, we demonstrate that the emission properties of the SP-CDs can be used to construct UV and pH sensing materials as well as light emitting diode(LED) with different colors.