期刊
NANO LETTERS
卷 10, 期 7, 页码 2679-2682出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl101474d
关键词
Graphene; excited states; electronic relaxation; triplet states
类别
资金
- Petroleum Research Fund [47677-G10]
- National Science Foundation [0747751]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0747751] Funding Source: National Science Foundation
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
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