The first use of the combination of ammonium citrate (AC) and ethylenediamine tetraacetic acid (EDTA) as coordinating precursors for the synthesis of highly fluorescent (quantum yield = 67%) multicolour nitrogen-doped carbon dots (CDs) is reported. Under UV light, these CDs emitted outstanding luminescence in colours from dark blue to red. Interestingly, a single component white-light CD point with high fluorescence efficiency was obtained by surface control. Alterations of the photoluminescence (PL) emission of these full-colour CDs were tentatively proposed to benefit from surface functional groups, such as CO and CN. An energy-level model was proposed to explain the continuously adjustable full-colour emission. The white light may be attributed to the overlap of diverse light emission induced by electron transitions between the energy levels. Subsequently, to avoid aggregation-induced solid-state fluorescence quenching, multicolour CD-based sandwich glasses with various colour emission was fabricated, which is anticipated to be compatible with the all-optical light-emitting diodes (LEDs). The facile preparation and outstanding optical features are believed to provide an alternative synthesis route and inspire more research into applications and CD-based materials of multicolour CDs.

中文翻译：

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多色氮掺杂碳点：可调光致发光和夹层荧光玻璃基发光二极管

据报道，首次使用柠檬酸铵（AC）和乙二胺四乙酸（EDTA）的组合作为配位前体，用于合成高荧光（量子产率= 67％）的多色氮掺杂碳点（CD）。在紫外线的作用下，这些CD发出从深蓝色到红色的出色发光。有趣的是，通过表面控制获得了具有高荧光效率的单组分白光CD点。暂时提议改变这些全色CD的光致发光（PL）发射，以受益于表面官能团（例如C O和CN.提出了能级模型来解释连续可调的全色发射。白光可归因于由能级之间的电子跃迁引起的不同发光的重叠。随后，为了避免聚集引起的固态荧光猝灭，制造了具有各种颜色发射的基于多色CD的夹层玻璃，其有望与全光学发光二极管（LED）兼容。人们认为，这种简便的制备方法和出色的光学特性可提供一种替代的合成途径，并激发人们对多色CD的应用和基于CD的材料进行更多的研究。