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 journalArticle

340 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 languageEnglish
Pages (from-to)8203-8208
Number of pages6
JournalACS Nano
Volume6
Issue number9
DOIs
Publication statusPublished - 2012 Sep 25

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Graphene
Semiconductor quantum dots
Luminescence
graphene
quantum dots
luminescence
Photoluminescence
photoluminescence
electromagnetic absorption
High resolution transmission electron microscopy
Optoelectronic devices
Light absorption
Absorption spectra
absorption spectra
transmission electron microscopy
high resolution

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

Cite this

Kim, S., Hwang, S. W., Kim, M. K., Shin, D. Y., Shin, D. H., Kim, C. O., ... Hong, B. H. (2012). Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape. ACS Nano, 6(9), 8203-8208. https://doi.org/10.1021/nn302878r
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. / Anomalous behaviors of visible luminescence from graphene quantum dots : Interplay between size and shape. In: ACS Nano. 2012 ; Vol. 6, No. 9. pp. 8203-8208.
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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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Kim, S, Hwang, SW, Kim, MK, Shin, DY, Shin, DH, Kim, CO, Yang, SB, Park, JH, Hwang, E, Choi, SH, Ko, G, Sim, S, Sone, C, Choi, HJ, Bae, S & Hong, BH 2012, 'Anomalous behaviors of visible luminescence from graphene quantum dots: Interplay between size and shape', ACS Nano, vol. 6, no. 9, pp. 8203-8208. https://doi.org/10.1021/nn302878r

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

In: ACS Nano, Vol. 6, No. 9, 25.09.2012, p. 8203-8208.

Research output: Contribution to journalArticle

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AU - Kim, Sung

AU - Hwang, Sung Won

AU - Kim, Min Kook

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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