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Ultrastable and ultrasensitive pH-switchable carbon dots with high quantum yield for water quality identification,glucose detection,and two starch-based solid-state fluorescence materials

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Nano Research 2020年第11期13卷 3012-3018页

作者： Daiyong Chao Jinxing Chen Qing Dong Weiwei Wu Desheng Qi Shaojun Dong College of Chemistry Jilin UniversityChangchun130012China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

It is attractive and encouraging to develop new fluorescent carbon dots(CDs)with excellent optical properties and promising applications ***,highly-efficient green emissive CDs(m-CDs)with a high quantum yield(QY)of 71.7%in water are prepared through a facile solvothermal ***,the m-CDs exhibit excellent fluorescence stability in the pH range of 1–***,the fluorescence intensity of the m-CDs is almost completely quenched as the pH is increased from 9 to *** mechanism of the unique pH-responsive behavior is discussed in detail and a plausible mechanism is *** to the unique pH-responsive behavior,the m-CDs are used as a on-off fluorescent probe for water quality *** combining the reversible pH-ultrasensitive optical properties of the m-CDs in the pH range of 9–10 with the glucose oxidase-mimicking(GOx-mimicking)ability of Au nanoparticles(AuNPs),glucose can be quantitatively ***,two environment-friendly starch-based solid-state fluorescence materials(powder and film)are developed through green preparation routes.

关键词： carbon dot high quantum yield pH-ultrasensitive optical properties water quality identification glucose detection solid-state fluorescence materials

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Facile synthesis of high-brightness green-emitting carbon dots with narrow bandwidth towards backlight display

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Chinese Chemical Letters 2024年第5期35卷 277-282页

作者： Rui Cheng Tingting Zhang Xin Huang Jian Yu State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China

high-performance carbon dots(CDs)allowing the application in high-end display devices are highly desirable and usually limited by the absence of simple and easy synthesis *** this work,we exploited an easy-to-implement strategy for the one-step synthesis of green-emitting CDs(G-CDs)with superb optical *** G-CDs were synthesized using m-phenylenediamine(m-PD)as a single precursor,and the reaction reacted at 180℃for 12 h The resultant G-CDs exhibit high-purity and excitationindependent green fluorescence with the photoluminescence(PL)peak located at 516 nm,full width at half maximum(FWHM)of 46 nm,and PL quantum yield(QY)of∼80%under the 470nm excitation *** G-CDs and corresponding composite film prepared with polyvinyl butyral(G-CDs@PVB)exhibit good PL stability after undergoing long-time storage for one year and 360 h exposure under 460nm blue *** G-CDs@PVB film was used as color-conversion materials in green-emitting light-emitting diode(LED)application,exhibiting a Commission internationale de l’Eclairage(CIE)chromaticity coordinate of(0.21,0.44).The film was also used in CD-based liquid crystal display(CD-LCD)application,achieving a color gamut value of 85%.This work will offer a working basis for the synthesis of high-performance CDs as well as their application in displays.

关键词： Carbon dots One-step synthesis Narrow bandwidth high quantum yield Display

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Photo-induced Ag modulating carbon dots:Greatly improved fluorescent properties and derived sensing application

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Chinese Chemical Letters 2024年第1期35卷 338-342页

作者： Yuwei Wang Ye Li Guixiang Yang Xiaofeng Yang Chenglu Yan Huaqiao Peng Huiyong Wang Juan Du Baozhan Zheng Yong Guo Department of Chemistry Sichuan UniversityChengdu 610064China Institute of Quality Standard and Testing Technology for Agro-products Sichuan Academy of Agricultural SciencesChengdu 610066China Key Laboratory of Aviation Fuel&Chemical Airworthiness and Green Development The Second Research Institute of Civil Aviation Administration of ChinaChengdu 610041China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

Carbon dots(CDs)have been attracted much attention and widely studied due to their excellent fluorescence(FL)properties,better biocompatibility and outstanding photo/chemical ***,the disadvantage of lower quantum yield(QY)still limits its wide ***,we reported a novel and convenient strategy to prepare photo-induced Ag/CDs(p-Ag/CDs)by irradiating the mixed Ag+and hydrophobic CDs(h-CDs)acetone solution with ultraviolet(UV)*** obtained p-Ag/CDs exhibit a greatly enhanced FL emission together with a blue shift(460 nm)than h-CDs(520 nm).The QY of p-Ag/CDs is measured to be 51.1%,which is 10.4 times higher than that of h-CDs(4.9%),indicating that photo-induced Ag modulation can effectively improve the optical properties of *** mechanisms for the FL enhancement and blue shift of h-CDs are studied in *** results prove that the greatly enhanced FL emission is from the generated Ag nanoparticles(AgNPs)by UV light irradiation based on metal-enhanced fluorescence(MEF),and the increased oxygen-contained groups in this process lead to the blue shift in CDs ***,the p-Ag/CDs exhibit higher sensitivity and selectivity for sulfide ions(S2-)detection than that of h-CDs,which have a lower response to S2-.This work not only offers a novel strategy to improve the FL properties of materials but also endows them with new functions and broadens their application fields.

关键词： Carbon dots Photo-induced Ag modulating Fluorescent enhancement high quantum yield Derived sensing application Sulfide determination

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Controllable emission bands and morphologies of high-quality CsPbX3 perovskite nanocrystals prepared in octane

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Nano Research 2018年第9期11卷 4654-4663页

作者： Shuai Ye Mengjie Zhao Jun Song Junle Qu Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University Shenzhen 518060 China

Halide perovskite （CsPbX3, X = C1, Br, or I） quantum dots have received increasing attention as novel colloidal nanocrystals （NCs）. Accurate control of emission bands and NC morphologies are vital prerequisites for most CsPbX3 NC practical applications. Therefore, a facile method of synthesizing CsPbX3 （X = C1, Br, or I） NCs in the nonpolar solvent octane was developed. The process was conducted in air at - 90℃ to synthesize high-quality CsPbX3 NCs showing 12-44 nm wide emission and high photoluminescence quantum yield, exceeding 90%. An in situ anion-exchange method was developed to tune CsPbX3 NC photoluminescence emission, using PbX2 dissolved in octane as the halide source. NC morphology was controlled by dissolving specific metal-organic salts in the precursor solution prior to nucleation, and nanocubes, nanodots, nanosheets, nanoplatelets, nanorods, and nanowires were obtained following the same general method providing a facile, versatile route to controlling CsPbX3 NC emission bands and morphologies, which will broaden the range of CsPbX3 NC practical applications.

关键词： CsPbX3 quantum dots nonpolar solvent octane controllable composition controllable morphology high quantum yield

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Crystal structures,two-photon absorption and theoretical calculation of a series of bis-vinylpyridine compounds synthesized by one-step solid state reaction

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Science China Chemistry 2011年第5期54卷 730-736页

作者： LI DongMei ZHANG Qiong A.M.Showkot HOSSAIN SUN Mei WU JieYing YANG JiaXiang ZHOU HongPing TAO LiMin WANG ChuanKui TIAN YuPeng Key Laboratory of Functional Inorganic Materials Chemistry of Anhui Province Department of Chemistry Anhui UniversityHefei 230039China Department of Physics Shandong Normal UniversityJinan 250014China State Key Laboratory of Crystal Materials Shandong University Jinan 250100China State Key Laboratory of Coordination Chemistry Nanjing University Nanjing 210093China

Three bis-vinylpyridine compounds (4,4′-bis(2-vinylpyridine)biphenyl L1,4,4′-bis(3-vinylpyridine) biphenyl L2,and 4,4′-bis (4-vinylpyridine)biphenyl L3) were synthesized by one-step solid-state reactions at room temperature,giving nearly quantitative yields. The compounds obtained were fully characterized by IR,MS and NMR spectroscopies. The structures of L2 and L3 were determined by single crystal X-ray diffraction analysis. No noticeable solvatochromism was observed in either one-photon absorption or one-photon excited fluorescence spectra. All of the compounds have high fluorescence quantum yields and long fluorescence lifetime. The linear and nonlinear optical properties of the compounds were investigated both experimentally and theoretically. Interestingly,the position of the nitrogen atom from pyridine influences their two-photon absorption across-sections.

关键词： two-photon absorption one-step solid-state reaction high quantum yield pyridine derivatives

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