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

摘要:

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_0.3Bi_0.7F_2.4）为基质，在室温下通过共沉淀法复合制备C-CDs@K_0.3Bi_0.7F_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_0.3Bi_0.7F_2.4纳米粒子上。此外，还研究了C-CDs@K_0.3Bi_0.7F_2.4纳米复合材料热稳定性能。结果表明，C-CDs@K_0.3Bi_0.7F_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_0.3Bi_0.7F_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。

关键词:碳点;氟铋钾;室温合成;固态发光

Abstract:

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_0.3Bi_0.7F_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_0.3Bi_0.7F_2.4 nanoparticles. In addition， we also investigated the thermal stability of C-CDs@K_0.3Bi_0.7F_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_0.3Bi_0.7F_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.

Key words:carbon dots;fluorine bismuth potassium;room temperature synthesis;solid state luminescence