Fluorescent carbon dots (CDs) are admirable nanomaterials due to their superior optical properties and low cost. However, regulation of the emission colors in CDs for lighting device still remains a challenge. In this work, we developed a green hydrothermal method to obtain three emission colors of CDs using l-tyrosine (for blue CDs), o-phenylendiamine (for green CDs) and l-tyrosine/o-phenylendiamine mixture (for orange-red CDs). These CDs possess good water dispersibility, strong emission with high quantum yields, and excellent photostability. Furthermore, the resulting CDs were dispersed in polyvinyl alcohol (PVA) matrix to yield solid state films, where the self-quenching effect in solid state was effectively avoided. A full-color light-emitting diode was fabricated by packing the CDs-PVA composites on the top of a UV-chip, which have superior potential applications in CDs-based solid-state lighting system.

荧光碳点（CD）由于其卓越的光学性能和低成本而成为令人钦佩的纳米材料。然而，调节照明设备的CD中的发射颜色仍然是一个挑战。在这项工作中，我们开发了一种绿色水热方法，使用l-酪氨酸（对于蓝色CD），邻苯二胺（对于绿色CD）和l-酪氨酸获得CD的三种发射颜色。-酪氨酸/邻苯二胺混合物（用于橙红色CD）。这些CD具有良好的水分散性，具有高量子产率的强发射性和出色的光稳定性。此外，将所得的CD分散在聚乙烯醇（PVA）基质中以产生固态膜，从而有效避免了固态的自猝灭效应。通过将CDs-PVA复合材料封装在UV芯片的顶部来制造全色发光二极管，该复合材料在基于CDs的固态照明系统中具有潜在的优越应用。