碳点与铋基氟化物纳米材料室温复合研究

Study on the Composite of Carbon Dots and Bismuth Based Fluoride Nanomaterials at Room Temperature

为了解决碳点(CDs)在固态或聚集状态下荧光猝灭问题,提出了一种基于无机物复合的碳点固态荧光策略。以柠檬酸和乙醇胺为原料合成的青光碳点溶液(C-CDs)及水稳定性良好的氟铋钾(K_(0.3)Bi_(0.7)F_(2.4))为基质,在室温下通过共沉淀法复合制备C-CDs@K_(0.3)Bi_(0.7)F_(2.4)纳米复合材料。通过XRD、TEM、FT-IR和XPS等表征手段,证明了C-CDs附着在K_(0.3)Bi_(0.7)F_(2.4)纳米粒子上。此外,还研究了C-CDs@K_(0.3)Bi_(0.7)F_(2.4)纳米复合材料热稳定性能。结果表明,C-CDs@K_(0.3)Bi_(0.7)F_(2.4)纳米复合材料不仅能够在波长450 nm激发下发射出555 nm黄色荧光,而且在125℃下还能保持初始强度的55%,说明共价键复合的C-CDs@K_(0.3)Bi_(0.7)F_(2.4)纳米复合材料具有较好的热稳定性。该研究不仅为CDs基荧光粉的制备提供了一种新方法,也展现了CDs在照明领域中的应用前景。

In order to solve the problem of fluorescence quenching of carbon dots(CDs)in solid state or aggregate state,a solid-state fluorescence strategy of carbon dots based on inorganic compound was proposed.In this paper,the citric acid and ethanolamine was used in synthesize of cyan emissive carbon dots(C-CDs),and then combined with water-stable matrix of fluorobismuth potassium(K_(0.3)Bi_(0.7)F_(2.4)).The obtained composite has been characterized by XRD,TEM,FT-IR,XPS and other characterization methods.The results show that the C-CDs has been successfully modified on K_(0.3)Bi_(0.7)F_(2.4) nanoparticles.In addition,we also investigated the thermal stability of C-CDs@K_(0.3)Bi_(0.7)F_(2.4) nanocomposites,which not only emits 555 nm yellow fluorescence under 450 nm excitation,but also maintains 55%of the initial intensity at 125℃.It indicates that the covalently bonded C-CDs@K_(0.3)Bi_(0.7)F_(2.4) nanocomposites have good thermal stability.This study not only provides a new method for the preparation of CDs based phosphor,but also demonstrates the application prospect of CDs in the lighting field.