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Deep Ultraviolet Photoluminescence of Water-Soluble Self-Passivated Graphene Quantum Dots

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WOS被引频次:722
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成果类型:
期刊论文
作者:
Tang, Libin;Ji, Rongbin;Cao, Xiangke;Lin, Jingyu;Jiang, Hongxing;Li, Xueming;Teng, Kar Seng;Luk, Chi Man;Zeng, Songjun;Hao, Jianhua;Lau, Shu Ping
通讯作者:
Lau, S.P.(apsplau@polyu.edu.hk)
作者机构:
[Ji, Rongbin; Tang, Libin] Kunming Institute of Physics, Kunming, 650223, Yunnan Province, China
[Jiang, Hongxing; Cao, Xiangke; Lin, Jingyu] Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, United States
[Luk, Chi Man; Hao, Jianhua; Tang, Libin; Lau, Shu Ping; Zeng, Songjun] Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong, Hong Kong
[Li, Xueming] Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, China
[Teng, Kar Seng] Multidisciplinary Nanotechnology Center, College of Engineering, University of Swansea, Singleton Park, Swansea SA2 8PP, United Kingdom
通讯机构:
[Lau, Shu Ping] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China.
语种:
英文
关键词:
Average diameter - Blue light - Blue light emitting diodes - Carbon-based - Deep ultraviolet - Emission wavelength - grapheme - Hydrothermal methods - Microwave-assisted - Photoluminescence quantum yields - self-passivated - White light
期刊:
ACS NANO
ISSN:
1936-0851
年:
2012
卷:
6
期:
6
页码:
5102-5110
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:化学;WOS学科类别:Chemistry, Multidisciplinary;Chemistry, Physical;Materials Science, Multidisciplinary;Nanoscience & Nanotechnology
入藏号:
WOS:000305661300059;EI:20122715192621
基金类别:
Research Grants Council of Hong Kong [PolyU 5013/09P]; HK PolyU grants [G-XY3E, 1-ZV8N]; National Natural Science Foundation of China [61106098, 61066004]; NSF [DRM-0906879]
机构署名:
本校为其他机构
院系归属:
能源与环境科学学院(太阳能研究所)
摘要:
Figure Persented: Glucose-derived water-soluble crystalline graphene quantum dots (GQDs) with an average diameter as small as 1.65 nm (∼5 layers) were prepared by a facile microwave-assisted hydrothermal method. The GQDs exhibits deep ultraviolet (DUV) emission of 4.1 eV, which is the shortest emission wavelength among all the solution-based QDs. The GQDs exhibit typical excitation wavelength-dependent properties as expected in carbon-based quantum dots. However, the emission wavelength is independent of the size of the GQDs. The unique optical properties of the GQDs are attributed to the self-passivated layer on the surface of the GQDs as revealed by electron energy loss spectroscopy. The photoluminescence quantum yields of the GQDs were determined to be 7-11%. The GQDs are capable of converting blue light into white light when the GQDs are coated onto a blue light emitting diode. ©2012 American Chemical Society.
参考文献:
Alivisatos AP, 1996, SCIENCE, V271, P933, DOI 10.1126/science.271.5251.933
Bao L, 2011, ADV MATER, V23, P5801, DOI 10.1002/adma.201102866
Biedermann LB, 2009, PHYS REV B, V79, DOI 10.1103/PhysRevB.79.125411
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