Photonic Materials and Devices Laboratory, Department of Physics, National Institute of Technology Calicut, Kerala, India.
PG Department of Physics, St Joseph's College for Women, Alappuzha, Kerala, India.
Luminescence. 2022 Sep;37(9):1475-1481. doi: 10.1002/bio.4320. Epub 2022 Jul 18.
Although different studies in carbon dots (CDs) have been reported based on heteroatom doping, most of them have focussed on the enhancement of fluorescence properties. Here we report a comparative study of both fluorescence and room-temperature phosphorescence (RTP) of nitrogen-sulphur-doped CDs (N-S CDs) and nitrogen-boron-doped CDs (N-B CDs) with N-doped CDs (N CDs). The CDs used in the study were synthesized through microwave-assisted pyrolysis. Among the doped CDs, sulphur-doped CDs showed a high fluorescence quantum yield. Upon irradiation, the aqueous dispersion of the CDs demonstrated blue fluorescence. Furthermore, by incorporating the CDs in a potash alum matrix, blue fluorescence, as well as green phosphorescence was observed. The phosphorescence lifetime measurements indicated that the N-S CDs exhibited a longer emission lifetime and a red-shifted emission in contrast with other samples, which might be attributed to the presence of a greater proportion of surface states on the N-S CDs.
尽管已有基于杂原子掺杂的不同碳点 (CDs) 研究报告，但大多数研究都集中在荧光性质的增强上。在这里，我们报告了氮硫掺杂 CDs (N-S CDs) 和氮硼掺杂 CDs (N-B CDs) 与氮掺杂 CDs (N CDs) 的荧光和室温磷光 (RTP) 的对比研究。用于该研究的 CDs 是通过微波辅助热解合成的。在掺杂的 CDs 中，硫掺杂 CDs 表现出高的荧光量子产率。在照射下，CDs 的水性分散体显示出蓝色荧光。此外，通过将 CDs 掺入钾明矾基质中，观察到蓝色荧光以及绿色磷光。磷光寿命测量表明，与其他样品相比，N-S CDs 表现出更长的发射寿命和红移发射，这可能归因于 N-S CDs 上存在更大比例的表面态。
