Quantum confinement-induced tunable exciton states in graphene oxide
Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons...
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sg-ntu-dr.10356-981342023-07-14T15:44:47Z Quantum confinement-induced tunable exciton states in graphene oxide Lee, Jaichan Cole, Jacqueline M. Lee, Dongwook Seo, Jiwon Zhu, Xi Lee, Jiyoul Shin, Hyeon-Jin Shin, Taeh Lee, Hangil Su, Haibin School of Materials Science & Engineering Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons in graphene-based materials, a basic ingredient for optical devices, induced by quantum confinement. Electron confinement in the unreacted graphitic regions of graphene oxide was probed by high resolution X-ray absorption near edge structure spectroscopy and first-principles calculations. Using experiments and simulations, we were able to tune the core/valence exciton energy by manipulating the size of graphitic regions through the degree of oxidation. The binding energy of an exciton in highly oxidized graphene oxide is similar to that in organic electroluminescent materials. These results open the possibility of graphene oxide-based optoelectronic device technology. Published version 2013-09-04T08:14:38Z 2019-12-06T19:51:07Z 2013-09-04T08:14:38Z 2019-12-06T19:51:07Z 2013 2013 Journal Article Lee, D., Seo, J., Zhu, X., Lee, J., Shin, H. J., Cole, J. M., Shin, T., Lee, J., Lee, H.,& Su, H. (2013). Quantum confinement-induced tunable exciton states in graphene oxide. Scientific Reports, 3. 2045-2322 https://hdl.handle.net/10356/98134 http://hdl.handle.net/10220/13316 10.1038/srep02250 23872608 en Scientific reports © 2013 Nature Publishing Group. This is Open Access Journals.This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported license. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0 application/pdf |
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Graphene oxide has recently been considered to be a potential replacement for cadmium-based quantum dots due to its expected high fluorescence. Although previously reported, the origin of the luminescence in graphene oxide is still controversial. Here, we report the presence of core/valence excitons in graphene-based materials, a basic ingredient for optical devices, induced by quantum confinement. Electron confinement in the unreacted graphitic regions of graphene oxide was probed by high resolution X-ray absorption near edge structure spectroscopy and first-principles calculations. Using experiments and simulations, we were able to tune the core/valence exciton energy by manipulating the size of graphitic regions through the degree of oxidation. The binding energy of an exciton in highly oxidized graphene oxide is similar to that in organic electroluminescent materials. These results open the possibility of graphene oxide-based optoelectronic device technology. |
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School of Materials Science & Engineering |
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School of Materials Science & Engineering Lee, Jaichan Cole, Jacqueline M. Lee, Dongwook Seo, Jiwon Zhu, Xi Lee, Jiyoul Shin, Hyeon-Jin Shin, Taeh Lee, Hangil Su, Haibin |
format |
Article |
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Lee, Jaichan Cole, Jacqueline M. Lee, Dongwook Seo, Jiwon Zhu, Xi Lee, Jiyoul Shin, Hyeon-Jin Shin, Taeh Lee, Hangil Su, Haibin |
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Lee, Jaichan Cole, Jacqueline M. Lee, Dongwook Seo, Jiwon Zhu, Xi Lee, Jiyoul Shin, Hyeon-Jin Shin, Taeh Lee, Hangil Su, Haibin Quantum confinement-induced tunable exciton states in graphene oxide |
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Lee, Jaichan |
title |
Quantum confinement-induced tunable exciton states in graphene oxide |
title_short |
Quantum confinement-induced tunable exciton states in graphene oxide |
title_full |
Quantum confinement-induced tunable exciton states in graphene oxide |
title_fullStr |
Quantum confinement-induced tunable exciton states in graphene oxide |
title_full_unstemmed |
Quantum confinement-induced tunable exciton states in graphene oxide |
title_sort |
quantum confinement-induced tunable exciton states in graphene oxide |
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2013 |
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https://hdl.handle.net/10356/98134 http://hdl.handle.net/10220/13316 |
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1772825544479473664 |