激发波长
极性(国际关系)
极地的
激发
光致发光
纳米点
波长
聚集诱导发射
激发态
溶剂极性
光化学
辐射传输
溶剂
化学
材料科学
碳链
荧光
光电子学
纳米技术
光学
有机化学
物理
原子物理学
生物化学
细胞
天文
量子力学
作者
Shamsa Kanwal,Farukh Mansoor,Datao Tu,Renfu Li,Wei Zheng,Shan Lu,Xueyuan Chen
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (36): 13059-13065
被引量:1
摘要
Surface groups of carbon nanodots (CNDs) play a key role in modulating their photoluminescence (PL) properties. However, most of the as-prepared CNDs are complex mixtures of CNDs bearing different surface groups. Thus, the purification of CNDs is essential to reveal the PL mechanism of CNDs. Herein, we present a facile method to synthesize hydroxyl (-OH) free CNDs, followed by intelligently guided column chromatographic separation of CNDs with specific functional groups according to their degree of polarity. After systematic investigation of the separated non-polar CNDs (NP-CNDs) and polar CNDs (P-CNDs), it is revealed that radiative photon emission dominates in the NP-CNDs, which exhibits excitation wavelength-independent emissions. In contrast, an increase in the solvent polarity of P-CNDs improves Frank-Condon excited state stabilization to achieve excitation wavelength-dependent emissions. In particular, white-light emitting P-CNDs with CIE coordinates of (0.332, 0.336) are produced. These findings provide new insights into the nature of the PL mechanism for CNDs, which may pave the way towards the rational design of highly efficient and emission tunable CNDs for various applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI