Abstract Carbon dots (CDs) and CDs-polymer composites were one-step synthesized in a hydrothermal process using hexamethylenetetramine and polycarbonate as precursors. Their optical properties and the application as solid-state phosphors towards white light-emitting diodes (LEDs) were thoroughly investigated. CDs solutions exhibit strong yellow emission under blue illumination and possess excitation-independent luminescent behavior. Owing to precursor polymerization, CDs-polymer composites were synthesized in one step. The dried CDs-polymer composite powders exhibit excellent optical stability and no luminescence quenching was observed. Under light blue illumination, the powders show broad yellow luminescence with the peak wavelength centered at 550 nm and PL quantum yield of 14.86%. For their practical applications, stable white light emission was demonstrated by coating a 455 nm blue LED with the powders. Our research offers a valuable reference for growing CDs-polymer composites in a facile, low-cost and low-temperature hydrothermal process and developing white LEDs with light blue LEDs and metal-free phosphors.

中文翻译：

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具有固态光致发光的碳点-聚合物复合材料的一步水热合成

摘要 碳点 (CDs) 和 CDs-聚合物复合材料是使用六亚甲基四胺和聚碳酸酯作为前体在水热法中一步合成的。对它们的光学特性和作为固态磷光体在白色发光二极管 (LED) 中的应用进行了彻底的研究。CDs 溶液在蓝色照明下表现出强烈的黄色发射，并具有与激发无关的发光行为。由于前体聚合，CDs-聚合物复合材料一步合成。干燥的 CDs-聚合物复合粉末表现出优异的光学稳定性，没有观察到发光猝灭。在淡蓝色光照下，粉末呈宽黄色发光，峰值波长集中在 550 nm，PL 量子产率为 14.86%。对于它们的实际应用，通过用粉末涂覆 455 nm 蓝色 LED 证明了稳定的白光发射。我们的研究为在简便、低成本和低温水热工艺中生长 CD-聚合物复合材料以及开发具有淡蓝色 LED 和无金属荧光粉的白色 LED 提供了宝贵的参考。