Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots

Libin Tang; Rongbin Ji; Xiangke Cao; Jingyu Lin; Hongxing Jiang; Xueming Li; Kar Seng Teng; Chi Man Luk; Songjun Zeng; Jianhua Hao; Shu Ping Lau

doi:10.1021/nn300760g

Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots

Libin Tang, Rongbin Ji, Xiangke Cao, Jingyu Lin, Hongxing Jiang, Xueming Li, Kar Seng Teng, Chi Man Luk, Songjun Zeng, Jianhua Hao, Shu Ping Lau

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

1566 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	5102-5110
Number of pages	9
Journal	ACS Nano
Volume	6
Issue number	6
DOIs	https://doi.org/10.1021/nn300760g
State	Published - Jun 26 2012

Keywords

deep ultraviolet
fluorescence
grapheme
graphene quantum dots
quantum dots
self-passivated

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10.1021/nn300760g

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@article{e13ce467e37b41a585d1c7df93c209b0,

title = "Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots",

abstract = "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.",

keywords = "deep ultraviolet, fluorescence, grapheme, graphene quantum dots, quantum dots, self-passivated",

author = "Libin Tang and Rongbin Ji and Xiangke Cao and Jingyu Lin and Hongxing Jiang and Xueming Li and Teng, {Kar Seng} and Luk, {Chi Man} and Songjun Zeng and Jianhua Hao and Lau, {Shu Ping}",

year = "2012",

month = jun,

day = "26",

doi = "10.1021/nn300760g",

language = "English",

volume = "6",

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journal = "ACS Nano",

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T1 - Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots

AU - Tang, Libin

AU - Ji, Rongbin

AU - Cao, Xiangke

AU - Lin, Jingyu

AU - Jiang, Hongxing

AU - Li, Xueming

AU - Teng, Kar Seng

AU - Luk, Chi Man

AU - Zeng, Songjun

AU - Hao, Jianhua

AU - Lau, Shu Ping

PY - 2012/6/26

Y1 - 2012/6/26

N2 - 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.

AB - 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.

KW - deep ultraviolet

KW - fluorescence

KW - grapheme

KW - graphene quantum dots

KW - quantum dots

KW - self-passivated

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U2 - 10.1021/nn300760g

DO - 10.1021/nn300760g

M3 - Article

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SN - 1936-0851

VL - 6

SP - 5102

EP - 5110

JO - ACS Nano

JF - ACS Nano

IS - 6

ER -

Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots

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Keywords

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