In our work, N-doped carbon dots (CDs) were synthesized by a facile hydrothermal method with fermented rice as the carbon source. The CDs show bright blue fluorescence, and the maximum emission wavelength was 380 nm with wavelength ranges from 320 to 560 nm. Interestingly, these as-prepared CDs show strong blue photoluminescent properties under the radiation with ultraviolet (UV) light. Moreover, it also exhibits good sensitive fluorescence detection for Fe³⁺ ions; the detection limit is 0.1 μM, which is significant fluorescence quenching based on CDs. Other representative metal ions were further tested to verify their selectivity, which provides a solid underpinning for the practical use in Fe³⁺ ions detection in real samples, e.g. underground water. In addition, the CDs work well as a fluorescent ink and can encrypt and store information.

在我们的工作中，以发酵大米为碳源，通过简便的水热法合成了 N 掺杂的碳点（CDs）。CDs显示出明亮的蓝色荧光，最大发射波长为380 nm，波长范围为320至560 nm。有趣的是，这些制备的 CD 在紫外线 (UV) 光辐射下显示出强烈的蓝色光致发光特性。此外，它还对Fe ³⁺离子表现出良好的灵敏荧光检测；检测限为0.1 μM，是基于CDs的显着荧光猝灭。进一步测试了其他代表性金属离子以验证其选择性，这为实际样品中 Fe ³⁺离子检测的实际应用提供了坚实的基础，例如地下水。此外，CD 还可以作为荧光墨水使用，并且可以加密和存储信息。