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Unraveling Bright Molecule‐Like State and Dark Intrinsic State in Green‐Fluorescence Graphene Quantum Dots via Ultrafast Spectroscopy
Abstract
Graphene quantum dots (GQDs) have recently emerged as a promising type of low‐toxicity, high‐biocompatibility, and chemically inert fluorescence probe with a high resistance to photobleaching. They are a prospective substitution for organic materials in light‐emitting devices (LED), enabling the predicted concept of much brighter and more robust carbon LED (CLED). However, the mechanism of GQD emission remains an open problem despite extensive studies conducted so far, which is becoming the greatest obstacle in the route of technical improvement of GQD quantum efficiency. This problem is solved by the combined usage of femtosecond transient absorption spectroscopy and femtosecond time‐resolved fluorescence dynamics measured by a fluorescence upconversion technique, as well as a nanosecond time‐correlated single‐photon counting technique. A fluorescence emission‐associated dark intrinsic state due to the quantum confinement of in‐plane functional groups is found in green‐fluorescence graphene quantum dots by the ultrafast dynamics study, and the two characteristic fluorescence peaks that appear in all samples are attributed to independent molecule‐like states. This finding establishes the correlation between the quantum confinement effect and molecule‐like emission in the unique green‐fluorescence graphene quantum dots, and may lead to innovative technologies of GQD fluorescence enhancement, as well as its broad industrial application.
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Cited by
Zhu, S., Song, Y., Zhao, X., Shao, J., Zhang, J., & Yang, B. (2015) · Nano Research · doi:10.1007/s12274-014-0644-3 · Cited by 2,781
Self-citationCommon Origin of Green Luminescence in Carbon Nanodots and Graphene Quantum Dots
Wang, L., Zhu, S.-J., Wang, H.-Y., Qu, S.-N., Zhang, Y.-L., Zhang, J.-H., Chen, Q.-D., Xu, H.-L., Han, W., Yang, B., et al. (2014) · ACS Nano · doi:10.1021/nn500368m · Cited by 816
Self-citationShining carbon dots: Synthesis and biomedical and optoelectronic applications
Yuan, F., Li, S., Fan, Z., Meng, X., Fan, L., & Yang, S. (2016) · Nano Today · doi:10.1016/j.nantod.2016.08.006 · Cited by 746
Carbon Dots: Synthesis, Properties and Applications
Cui, L., Ren, X., Sun, M., Liu, H., & Xia, L. (2021) · Nanomaterials · doi:10.3390/nano11123419 · Cited by 538
Full‐Color Inorganic Carbon Dot Phosphors for White‐Light‐Emitting Diodes
Tian, Z., Zhang, X., Li, D., Zhou, D., Jing, P., Shen, D., Qu, S., Zboril, R., & Rogach, A. L. (2017) · Advanced Optical Materials · doi:10.1002/adom.201700416 · Cited by 470
Metadata
- Authors
- Wang, L., Zhu, S., Wang, H., Wang, Y., Hao, Y., Zhang, J., Chen, Q., Zhang, Y., Han, W., Yang, B., & Sun, H.
- Venue
- Advanced Optical Materials
- Publisher
- Wiley
- Published
- 2013-02-22
- Volume
- 1
- Issue
- 3
- Pages
- 264-271
- ISSN
- 2195-1071 (ISSN-L)
- OpenAlex
- W2140845289
- Cited by
- 161
- References
- 0
- FWCI
- 7.40
- Type
- journal article
- Language
- en
- Open access
- closed
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- Wang, L., Zhu, S., Wang, H., Wang, Y., Hao, Y., Zhang, J., Chen, Q., Zhang, Y., Han, W., Yang, B., & Sun, H. (2013). Unraveling Bright Molecule‐Like State and Dark Intrinsic State in Green‐Fluorescence Graphene Quantum Dots via Ultrafast Spectroscopy. Advanced Optical Materials. https://doi.org/10.1002/adom.201200020
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