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Amphiphilic Carbon Dots with Excitation‐Independent Double‐Emissions
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-06-05 , DOI: 10.1002/ppsc.202000146
Yun Liu 1 , Dong‐ming Sun 1, 2 , Zhi‐ying Zhang 1 , Li Zhang 1, 2 , Shi‐dong Nie 1 , Jun‐ping Xiao 2 , Yeon Sook Chung 3 , Hyeonho Choi 3 , Sunghan Kim 3 , Chun‐yan Liu 1
Affiliation  

Developing total carbon‐based multicolor emissive carbon dots (Cdots), especially amphiphilic Cdots (A‐Cdots) with several luminescent bands and limited emissive sites, is still a challenge. Herein, A‐Cdots with bright excitation‐independent blue/yellow photoluminescence (PL) bands from two types of fluorophores are synthesized by the solvothermal treatment of citric acid and dodecylamine in cyclohexane (c‐hexane) solution. Due to the hydrogen‐bonding interaction of carboxylic groups linked with A‐Cdots and the hydrophobic effects of long‐chain alkyl groups, assemblies of A‐Cdots with reversed micelle‐like structure formed in c‐hexane solution lead to remarkable yellow‐PL (y‐PL) with quantum yield of 33.1%. Time‐resolved fluorescence and the distinct solvation effects of A‐Cdots conclude that the blue‐PL and y‐PL are from the radiative recombination of emissive sites of amide and carboxylic groups. For the solvent‐dependent optical properties and the amplification effect of dual‐color PL, the A‐Cdots exhibit good potential in the very sensitive detection of trace impurities in alkane solution, such as ethanol in c‐hexane with content as low as 0.033% (v/v). With A‐Cdots as phosphors, white‐light‐emitting diodes (WLEDs) are successfully constructed with luminous efficiency of 52.72 lm W−1. This work provides a new thinking for the design of multicolor luminous Cdots materials and their potential applications.

中文翻译:

具有独立于激发的双排放的两亲碳点

研发总的基于碳的多色发射碳点(Cdots),尤其是具有几个发光带和有限发射点的两亲Cdots(A-Cdots)仍然是一个挑战。在此,通过在环己烷(c-己烷)溶液中对柠檬酸和十二烷基胺进行溶剂热处理,合成了来自两种类型荧光团的具有明亮激发独立的蓝色/黄色光​​致发光(PL)带的A-Cdots。由于与A-Cdots相连的羧基的氢键相互作用和长链烷基的疏水作用,在正己烷溶液中形成具有反胶束状结构的A-Cdots的组装导致显着的黄色PL( y‐PL),量子产率为33.1%。时间分辨荧光和A-Cdots的独特溶剂化作用得出结论,blue-PL和y-PL来自酰胺和羧基的发射位点的辐射重组。对于溶剂依赖性的光学性质和双色PL的放大效果,A-Cdots在灵敏地检测烷烃溶液中的痕量杂质(例如含量为0.033%的正己烷中的乙醇)方面具有良好的潜力(v / v)。以A点作为磷光体,成功构建了白光发光二极管(WLED),发光效率为52.72 lm W 例如在正己烷中的乙醇含量低至0.033%(v / v)。以A点作为磷光体,成功构建了白光发光二极管(WLED),发光效率为52.72 lm W 例如在正己烷中的乙醇含量低至0.033%(v / v)。以A点作为磷光体,成功构建了白光发光二极管(WLED),发光效率为52.72 lm W-1。这项工作为多色发光Cdots材料的设计及其潜在应用提供了新思路。
更新日期:2020-06-05
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