National and Local Joint Engineering Laboratory of Optical-Conversion Materials and Technology & School of Physical Science and Technology , Lanzhou University , Lanzhou 730000 , P.R. China.
Inorg Chem. 2018 Dec 17;57(24):15229-15239. doi: 10.1021/acs.inorgchem.8b02524. Epub 2018 Nov 29.
In this study, nitrogen-doped green emissive carbon dots (N-doped CDs) are synthesized via a convenient one-step solid state reaction method. The N-doped CDs show excitation-dependent fluorescence behavior with a maximum emission of 540 nm. Upon the optimum excitation at 400 nm, the quantum yield (QY) of the green emissive CDs is determined to be 13.4% and 50.3% in deionized water and ethanol, respectively. The higher quantum yield of N-doped CDs in ethanol could be caused by a strong hydrogen-bonding. In addition, the obtained N-doped CDs demonstrate excellent thermal stability, which is supported by the fact that the emission intensity nearly has no change after keeping the sample at 90 °C for 120 min. Moreover, the N-doped CDs exhibit green emission after entering into the HeLa cell membrane, indicating their potential to be used as bioimaging agent. Furthermore, the N-doped CDs are dispersed in PVA matrix for solid state film, where the solid-state quenching is effectively avoided. A green LED is fabricated by packing the CDs-PVA composite on the top of a 395 nm n-UV-Chip, which provides a potentially healthy green light.
在这项研究中，通过简便的一步固相反应法合成了氮掺杂绿色发光碳点（N-doped CDs）。N-doped CDs 表现出激发依赖性荧光行为，最大发射波长为 540nm。在最佳激发波长为 400nm 时，绿色发光 CDs 的量子产率（QY）在去离子水中和乙醇中分别确定为 13.4%和 50.3%。N-doped CDs 在乙醇中具有较高的量子产率可能是由于强氢键的存在。此外，所获得的 N-doped CDs 表现出优异的热稳定性，这一事实表明，在 90°C 下保持样品 120 分钟后，发射强度几乎没有变化。此外，N-doped CDs 在进入 HeLa 细胞膜后发出绿色荧光，表明其有潜力作为生物成像剂。此外，N-doped CDs 分散在 PVA 基质中形成固态薄膜，其中有效地避免了固态猝灭。通过将 CDs-PVA 复合材料包装在 395nm n-UV-Chip 的顶部，制备了绿色 LED，提供了一种潜在健康的绿光。
