Efficient UV emission from carbon dots derived from a green-tea extract  

作　　者：Henry Opoku Junkai Ren Xin Zhou Peijuan Zhang Shi Tang Dongfeng Dang Ludvig Edman Jia Wang 

机构地区：[1]Department of Physics,UmeåUniversity,SE-90187 Umea,Sweden [2]Department of Medical and Translational Biology,UmeåUniversity,SE-90187 Umea,Sweden [3]Engineering Research Center of Energy Storage Materials and Devices,Ministry of Education,School of Chemistry,Xi’an Jiaotong University,Xi’an 710049,China [4]Wallenberg Initiative Materials Science for Sustainability,Department of Physics,Umea University,SE-90187 Umea,Sweden

出　　处：《Nano Research》2025年第4期516-525,共10页纳米研究(英文版)

基　　金：J.C.Kempes Minnes Stipendiefond(SMK-21-0015 and SMK-1956);the Swedish Research Council(2019-02345,2020-04437,and 2021-04778);Bertil&Britt Svenssons stiftelse for belysningsteknik(2021 host-14 and 2022 host-31);the Knut and Alice Wallenberg Foundation for a Proof of Concept grant(KAW 2022.0381);the Wallenberg Initiative Materials Science for Sustainability(WISE)funded by the Knut and Alice Wallenberg Foundation(WISE-AP01-D02);the European Union through an ERC Advanced Grant(ERC,InnovaLEC,101096650).

摘　　要：Emissive carbon dots(CDs)that are synthesized from biomass can be highly sustainable,but the number of reported biomass-derived CDs that emit in the ultraviolet(UV)range is small.Moreover,current commercial UV-emitting materials rely heavily on the use of non-sustainable resources,such as rare metals,heavy metals,and petroleum chemicals.This yields that the development of efficient biomass-derived UVCDs is desired.Here,we report on the hydrothermal conversion of a common green-tea extract(Polyphenon 60)into UV-CDs,which feature a photoluminescence(PL)peak wavelength of 384 nm,a full width at half maximum of 72 nm,and a photoluminescence quantum yield(PLQY)of 17% in water.By shifting to a lower-polarity solvent of 3-phenoxyanisole,the PLQY is strongly enhanced to 81%,and the PL peak blue-shifts to 370 nm,while the maximum solubility is lowered.These observations support the notion that the UV-CDs feature aggregation-induced emission and that they are endowed with hydrophilic surface groups.Moreover,the findings of excitation-wavelength-independent PL and a nanosecond-level short emission lifetime reveal that it is a single distinct fluorophore that produces the UV emission.We finally report preliminary results that the UV-CDs exhibit potential for inhibiting the proliferation of cancer cells.

关 键 词：carbon dots ultraviolet(UV)emission biomass aggregation-induced-emission cell proliferation inhibitor 

分 类 号：O62[理学—有机化学]