光致发光
激发态
偶极子
基态
电偶极子跃迁
斯托克斯位移
吸收(声学)
电介质
化学
跃迁偶极矩
量子点
分子物理学
材料科学
原子物理学
磁偶极子
纳米技术
发光
物理
光电子学
有机化学
复合材料
作者
Parisa Mohammad-Jafarieh,Abolfazl Akbarzadeh,Rahman Salamat-Ahangari,Mohammad Pourhassan-Moghaddam,Kazem Jamshidi-Ghaleh
出处
期刊:BMC chemistry
[Springer Nature]
日期:2021-09-25
卷期号:15 (1)
被引量:3
标识
DOI:10.1186/s13065-021-00779-6
摘要
Carbon dots (C-dots) are photoluminescent nanoparticles with less than 10 nm in size. Today, many studies are performed to exploit the photoluminescence (PL) property of carbon dots, and our focus in this study is to estimate the dipole moment of carbon dots. For reaching our aims, C-dots were synthesized and dissolved in the different solvents.Carbon dots with intense photoluminescence properties have been synthesized by a one-step hydrothermal method from a carbon bio-source. In this research, we report on the effect of aprotic solvents on absorption and fluorescence spectra and dipole moments of C-dots dispersed in a range of many aprotic solvents with various polarity and dielectric constant at room temperature. The change in the value of dipole moment was estimated by using the Stokes shifts. The difference between the dipole moment of the excited state and the ground state was shown using an extended form of Lippert equations by Kawski and co-workers.The values found for μg = 1.077 D, and μe = 3.157 D, as well as the change in the dipole moments. The results showed that the dipole moment of the excited state is more than the ground state, indicating a high density and redistribution of electrons in the excited state. Finally, the quantum yield of C-dots in the eclectic aprotic solvents was communicated and discussed.
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