Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape

Sung Kim; Sung Won Hwang; Min Kook Kim; Dong Yeol Shin; Dong Hee Shin; Chang Oh Kim; Seung Bum Yang; Jae Hee Park; Euyheon Hwang; Suk Ho Choi; Geunwoo Ko; Sunghyun Sim; Cheolsoo Sone; Hyoung Joon Choi; Sukang Bae; Byung Hee Hong

doi:10.1021/nn302878r

Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape

Sung Kim, Sung Won Hwang, Min Kook Kim, Dong Yeol Shin, Dong Hee Shin, Chang Oh Kim, Seung Bum Yang, Jae Hee Park, Euyheon Hwang, Suk Ho Choi, Geunwoo Ko, Sunghyun Sim, Cheolsoo Sone, Hyoung Joon Choi, Sukang Bae, Byung Hee Hong

Research output: Contribution to journal › Article › peer-review

614 Citations (Scopus)

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 = ∼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 = ∼17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.

Original language	English
Pages (from-to)	8203-8208
Number of pages	6
Journal	ACS Nano
Volume	6
Issue number	9
DOIs	https://doi.org/10.1021/nn302878r
Publication status	Published - 25 Sept 2012

Keywords

edge
graphene
photoluminescence
quantum dot
shape
size

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10.1021/nn302878r

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title = "Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape",

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 = ∼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 = ∼17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.",

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author = "Sung Kim and Hwang, {Sung Won} and Kim, {Min Kook} and Shin, {Dong Yeol} and Shin, {Dong Hee} and Kim, {Chang Oh} and Yang, {Seung Bum} and Park, {Jae Hee} and Euyheon Hwang and Choi, {Suk Ho} and Geunwoo Ko and Sunghyun Sim and Cheolsoo Sone and Choi, {Hyoung Joon} and Sukang Bae and Hong, {Byung Hee}",

year = "2012",

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doi = "10.1021/nn302878r",

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AU - Hwang, Sung Won

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AU - Shin, Dong Yeol

AU - Shin, Dong Hee

AU - Kim, Chang Oh

AU - Yang, Seung Bum

AU - Park, Jae Hee

AU - Hwang, Euyheon

AU - Choi, Suk Ho

AU - Ko, Geunwoo

AU - Sim, Sunghyun

AU - Sone, Cheolsoo

AU - Choi, Hyoung Joon

AU - Bae, Sukang

AU - Hong, Byung Hee

PY - 2012/9/25

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N2 - 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 = ∼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 = ∼17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.

AB - 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 = ∼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 = ∼17 nm as the GQD size increases, as demonstrated by high-resolution transmission electron microscopy.

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Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape

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Keywords

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