Triplet States and Electronic Relaxation in Photoexcited Graphene Quantum Dots
Triplet States and Electronic Relaxation in Photoexcited Graphene Quantum Dots
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DOI：
10.1021/nl101474d
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发表时间：
2010-07-01
期刊：
影响因子：
10.8
通讯作者：
Li, Liang-shi
中科院分区：
文献类型：
--
作者：
Mueller, Mallory L.;Yan, Xin;Li, Liang-shi
光激发石墨烯中的电子弛豫是其光反应性及其光电应用（如光电探测器和太阳能电池）的核心。本文报道了具有均匀尺寸的胶体石墨烯量子点中电子能量弛豫途径的首次系综研究。我们表明，光激发石墨烯量子点具有显著的弛豫到三重态的概率，并且在室温下发射磷光和荧光。由于三重态电子的长寿命和反应活性，我们的研究结果对石墨烯的应用具有重要意义
Electronic relaxation in photoexcited graphenes is central to their photoreactivity and their optoelectrical applications such as photodetectors and solar cells Herein we report on the first ensemble studies of electronic energy relaxation pathways in colloidal graphene quantum dots with uniform size We show that the photoexcited graphene quantum dots have a significant probability of relaxing into triplet states and emit both phosphorescence and fluorescence at room temperature, with relative intensities depending on the excitation energy Because of the long lifetime and reactivity of triplet electronic states, our results could have significant implications for applications of graphenes