Synthesis of carbon dots with strong luminescence in both dispersed and aggregated states by tailoring sulfur doping
Synthesis of carbon dots with strong luminescence in both dispersed and aggregated states by tailoring sulfur doping
复制标题
通过定制硫掺杂合成分散和聚集状态下具有强发光的碳点
DOI：
10.1016/j.jcis.2021.11.179
复制
发表时间：
2022-03-01
影响因子：
9.9
通讯作者：
Sun, Hongchen
中科院分区：
文献类型：
--
作者：
Li, Xianjing;Zheng, Mengdan;Sun, Hongchen
碳量子点（CDots）是一类环境友好的碳基发光纳米材料，已被应用于各种领域，包括生物成像和发光二极管（LED）。然而，在这些应用之前，CDot通常需要修改，因为它的一些限制（例如，聚集诱导发光猝灭）使其难以在固态下应用。为了同时实现CDots的多种应用，本文研究了如何通过微波辅助加热水杨酸和硫脲制备在分散态和聚集态都具有强绿黄色荧光的CDots。基于控制测试和密度泛函理论计算的分析，硫元素被掺杂到CDots中，并证明是关键的控制光致发光（PL）发射颜色。CDots具有良好的生物相容性和光稳定性，其光致发光量子产率（32%）能够作为生物成像试剂在体外和体内发挥作用，没有任何副作用。此外，聚集的CDots还表现出高的光致发光量子产率（26%）和显着的耐有机溶剂。这些优点将确保S掺杂的CDot可以用作颜色转换层，使得可以制造具有不同Commission International de L 'Eclariage坐标和可调色温的白色LED。(c)2021爱思唯尔公司All rights reserved.
Carbon dots (CDots), a class of environmentally friendly carbon-based luminescent nanomaterial, have been applied in a wide variety of fields, including bioimaging and light-emitting diodes (LEDs). Prior to these applications, however, CDots usually require modifications because some of its limitations (e.g., the aggregation-induced luminescence quenching) make it difficult to apply in solid state. In order to realize CDots-based multiple applications simultaneously, this paper examines how CDots with a strong greenish-yellow fluorescence in both dispersed and aggregated states are prepared by microwaveassisted heating salicylic acid and thiourea. Based on control testing and the analysis of density functional theory calculations, S element from thiourea is doped into CDots and proves to be critical in governing the photoluminescence (PL) emission color. Featured with excellent biocompatibility and photostability, the dispersed CDots with photoluminescence quantum yields (32%) are able to function as a biological imaging reagent in vitro and in vivo without any side effect. Furthermore, the aggregated CDots also exhibit high photoluminescence quantum yields (26%) and remarkable resistance to organic solvent. These advantages will ensure that S-doped CDots can be applied as a color conversion layer so that white LEDs with different Commission International de L'Eclariage coordinates and tunable color temperature can be fabricated. (c) 2021 Elsevier Inc. All rights reserved.