Issue 42, 2012

An efficient and stable fluorescent graphenequantum dot–agar composite as a converting material in white light emitting diodes

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.

Graphical abstract: An efficient and stable fluorescent graphene quantum dot–agar composite as a converting material in white light emitting diodes

Supplementary files

Article information

Article type
Communication
Submitted
08 Aug 2012
Accepted
20 Sep 2012
First published
20 Sep 2012

J. Mater. Chem., 2012,22, 22378-22381

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, S. F. Yu, K. S. Teng and S. P. Lau, J. Mater. Chem., 2012, 22, 22378 DOI: 10.1039/C2JM35305A

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