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Anomalous Behaviors of Visible Luminescence from Graphene Quantum Dots: Interplay between Size and Shape

Cited 387 time in Web of Science Cited 405 time in Scopus
Authors
Kim, Sung; Hwang, Sung Won; Kim, Min-Kook; Shin, Dong Yeol; Shin, Dong Hee; Kim, Chang Oh; Yang, Seung Bum; Park, Jae Hee; Hwang, Euyheon; Choi, Suk-Ho; Ko, Geunwoo; Sim, Sunghyun; Sone, Cheolsoo; Choi, Hyoung Joon; Bae, Sukang; Hong, Byung Hee
Issue Date
2012-09
Citation
ACS Nano, Vol.6 No.9, pp.8203-8208
Keywords
graphenequantum dotsizeshapeedgephotoluminescence
Abstract
For the application of graphene quantum dots (GQDs) to optoelectronic nanodevices, it is of critical importance to understand the mechanisms which result in novel phenomena of their light absorption/emission. Here, we present size-dependent shape/edge-state variations of GQDs and visible photoluminescence (PL) showing anomalous size dependences. With varying the average size (d(a)) of GQDs from 5 to 35 nm, the peak energy of the absorption spectra monotonically decreases, while that of the visible PL spectra unusually shows nonmonotonic behaviors having a minimum at d(a) = similar to 17 nm. The PL behaviors can be attributed to the novel feature of GQDs, that is, the circular-to-polygonal-shape and corresponding edge-state variations of GQDs at d(a) = similar to 17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.
ISSN
1936-0851
URI
https://hdl.handle.net/10371/172127
DOI
https://doi.org/10.1021/nn302878r
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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