The carbon nanodots are the newly emerging areas of research which have applications in many fields such as sensors, catalysts, bioimaging etc. Their excellent photoluminescence emission in visible region has prompted many researchers to explore new synthesis routes and precursors for better quantum yield. In this work carbon quantum dots are synthesized by using aloe vera biomass by facile carbonization process. The aqueous solution of carbon quantum dots (CQDs) shows blue light emission upon excitation by 365 nm ultra violet radiation. The field effect scanning electron microscopy images showed CQDs as spherical quantum dots of the size around 10 nm. The transmission electron microscopy (TEM) bright field images confirmed the size of the CQDs. The CQDs thus prepared can be used for bioimaging of plant cells and as an ink for security printing applications. A CQD@LaPO₄:Eu³⁺ nanocomposite has been prepared and its photoluminescence property has been studied. The increased photoluminescence intensity of composite can be attributed to Förster Resonance Energy Transfer (FRET) from CQDs to Eu³⁺.

碳纳米点是新兴的研究领域，在传感器、催化剂、生物成像等多个领域都有应用。它们在可见光区的优异光致发光发射促使许多研究人员探索新的合成路线和前驱体以获得更好的量子产率。在这项工作中，使用芦荟生物质通过简单的碳化过程合成了碳量子点。碳量子点 (CQD) 的水溶液在 365 nm 紫外辐射激发下显示蓝光发射。场效应扫描电子显微镜图像显示 CQD 为大小约为 10 nm 的球形量子点。透射电子显微镜 (TEM) 明场图像证实了 CQD 的大小。如此制备的 CQD 可用于植物细胞的生物成像和作为安全印刷应用的油墨。CQD@LaPO₄ :Eu ³⁺纳米复合材料的制备和光致发光性能的研究。复合材料的光致发光强度增加可归因于从 CQD 到 Eu ^{3+ 的}Förster 共振能量转移 (FRET) 。