The influence of ultraviolet (UV) laser irradiation on the optical properties of carbon dots (CDs) prepared by the hydrothermal synthesis from citric acid and ethylenediamine has been investigated. Investigation was performed in close-packed carbon films obtained by drop-casting. Observed photoluminescence redshift in films was ascribed to Förster Resonance Energy Transfer (FRET). UV laser irradiation increased carbon dot film light transmission and photoluminescence intensity and leads to a blueshift of photoluminescence. We attribute these changes to CD surface distraction via oxidation that leads to changing of FRET conditions. Controllable changing of carbon dot transmission and photoluminescence parameters by confocal laser irradiation might be used for optical microcoding and the creation of fluorescent labels.

中文翻译：

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具有高效 Interdot Förster 共振能量转移的碳点薄膜用于紫外光氧化光学编码

研究了紫外（UV）激光照射对柠檬酸和乙二胺水热合成制备的碳点（CDs）光学性质的影响。在通过滴铸获得的密堆积碳膜中进行了研究。在薄膜中观察到的光致发光红移归因于 Förster 共振能量转移 (FRET)。紫外激光照射增加了碳点膜的透光率和光致发光强度，并导致光致发光蓝移。我们将这些变化归因于通过氧化导致 FRET 条件变化的 CD 表面分心。通过共焦激光照射可控地改变碳点透射率和光致发光参数可用于光学微编码和荧光标记的创建。