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

被引：1565

作者：

Tang, Libin ^{[1
,2
]}

Ji, Rongbin ^{[2
]}

Cao, Xiangke ^{[3
]}

Lin, Jingyu ^{[3
]}

Jiang, Hongxing ^{[3
]}

Li, Xueming ^{[4
]}

Teng, Kar Seng ^{[5
]}

Luk, Chi Man ^{[1
]}

Zeng, Songjun ^{[1
]}

Hao, Jianhua ^{[1
]}

Lau, Shu Ping ^{[1
]}

机构：

[1] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China

[2] Kunming Inst Phys, Kunming 650223, Yunnan Province, Peoples R China

[3] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA

[4] Yunnan Normal Univ, Solar Energy Res Inst, Kunming 650092, Peoples R China

[5] Univ Swansea, Coll Engn, Multidisciplinary Nanotechnol Ctr, Swansea SA2 8PP, W Glam, Wales

来源：

ACS NANO | 2012年 / 6卷 / 06期

基金：

中国国家自然科学基金;

关键词：

graphene; quantum dots; deep ultraviolet; fluorescence; self-passivated; graphene quantum dots; LIGHT-EMITTING-DIODES; BORON-NITRIDE; SIZE; SPECTROSCOPY; EFFICIENCY; SHEETS;

D O I：

10.1021/nn300760g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Glucose-derived water-soluble crystalline graphene quantum dots (GQDs) with an average diameter as small as 1.65 nm (similar to 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.

引用

页码：5102 / 5110

页数：9

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