An efficient and stable fluorescent graphene quantum dot-agar composite as a converting material in white light emitting diodes

C. M. Luk; L. B. Tang; W. F. Zhang; Siu Fung Yu; K. S. Teng; Shu Ping Lau

doi:10.1039/c2jm35305a

An efficient and stable fluorescent graphene quantum dot-agar composite as a converting material in white light emitting diodes

C. M. Luk, L. B. Tang, W. F. Zhang, Siu Fung Yu, K. S. Teng, Shu Ping Lau

Research output: Journal article publication › Journal article › Academic research › peer-review

170 Citations (Scopus)

Abstract

Graphene quantum dots (GQDs) have attracted great attention due to their unique optoelectronic properties. There remains a critical challenge to utilize the water-soluble GQDs for device applications. Here we report a facile method to fabricate a GQD-agar composite. The composite exhibits excellent optical stability and no luminescence quenching is observed. The composite is successfully applied as a colour converting material in blue light-emitting diodes (LEDs) to achieve white light emission. The luminous efficiency and light conversion efficiency of the white LED are 42.2 lm W -1 and 61.1% respectively. The light conversion efficiency of the WLED is stable for over 100 hours of continuous operation.

Original language	English
Pages (from-to)	22378-22381
Number of pages	4
Journal	Journal of Materials Chemistry
Volume	22
Issue number	42
DOIs	https://doi.org/10.1039/c2jm35305a
Publication status	Published - 14 Nov 2012

ASJC Scopus subject areas

General Chemistry
Materials Chemistry

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10.1039/c2jm35305a

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abstract = "Graphene quantum dots (GQDs) have attracted great attention due to their unique optoelectronic properties. There remains a critical challenge to utilize the water-soluble GQDs for device applications. Here we report a facile method to fabricate a GQD-agar composite. The composite exhibits excellent optical stability and no luminescence quenching is observed. The composite is successfully applied as a colour converting material in blue light-emitting diodes (LEDs) to achieve white light emission. The luminous efficiency and light conversion efficiency of the white LED are 42.2 lm W -1 and 61.1% respectively. The light conversion efficiency of the WLED is stable for over 100 hours of continuous operation.",

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AU - Teng, K. S.

AU - Lau, Shu Ping

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AB - Graphene quantum dots (GQDs) have attracted great attention due to their unique optoelectronic properties. There remains a critical challenge to utilize the water-soluble GQDs for device applications. Here we report a facile method to fabricate a GQD-agar composite. The composite exhibits excellent optical stability and no luminescence quenching is observed. The composite is successfully applied as a colour converting material in blue light-emitting diodes (LEDs) to achieve white light emission. The luminous efficiency and light conversion efficiency of the white LED are 42.2 lm W -1 and 61.1% respectively. The light conversion efficiency of the WLED is stable for over 100 hours of continuous operation.

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An efficient and stable fluorescent graphene quantum dot-agar composite as a converting material in white light emitting diodes

Abstract

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