Carbon nanodots:A metal-free,easy-to-synthesize,and benign emitter for light-emitting electrochemical cells
作者机构：Department of PhysicsUmeåUniversitySE-90187 UmeåSweden LunaLEC ABLinnaeus väg 24SE-90187 UmeåSweden College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China
出 版 物：《Nano Research》 (纳米研究（英文版）)
年 卷 期：2022年第15卷第6期
页 面：5610-5618页
核心收录：
学科分类：0808[工学-电气工程] 07[理学] 08[工学] 070205[理学-凝聚态物理] 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：support from J.C.Kempes Minnes Stipendiefond(No.SMK-1849.1) the Swedish Energy Agency(Nos.45419-1,46523-1,and 50779-1) the Swedish Research Council(Nos.2017-04380,2017-04862,2018-03937,and 2019-02345) the Swedish Foundation for Strategic Research,Stiftelsen Olle Engkvist Byggmästare(Nos.186-0637 and 193-0578) Bertil&Britt Svenssons stiftelse för belysningsteknik,the Swedish Foundation for International Cooperation in Research and Higher Education via an Initiation Grant for Internationalization(No.2019-8553)。
主 题：carbon nanodot light-emitting electrochemical cell phloroglucinol sustainable synthesis solution-based fabrication
摘 要：Light-emitting electrochemical cells(LECs)can be fabricated with cost-efficient printing and coating methods,but a current drawback is that the LEC emitter is commonly either a rare-metal complex or an expensive-to-synthesize conjugated polymer.Here,we address this issue through the pioneering employment of metal-free and facile-to-synthesize carbon nanodots(CNDs)as the emitter in functional LEC devices.Circular-shaped(average diameter=4.4 nm)and hydrophilic CNDs,which exhibit narrow cyan photoluminescence(peak=485 nm,full width at half maximum=30 nm)with a high quantum yield of 77%in dilute ethanol solution,were synthesized with a catalyst-free,one-step solvothermal process using low-cost and benign phloroglucinol as the sole starting material.The propensity of the planar CNDs to form emission-quenching aggregates in the solid state was inhibited by the inclusion of a compatible 2,7-bis(diphenylphosphoryl)-9,9’-spirobifluorene host compound,and we demonstrate that such pristine host-guest CND-LECs turn on to a peak luminance of 118 cd·m^(−2)within 5 s during constant current-density driving at 77 mA·cm^(−2).
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