Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/13627
Title: An efficient and stable fluorescent graphene quantum dot-agar composite as a converting material in white light emitting diodes
Authors: Luk, CM
Tang, LB
Zhang, WF
Yu, SF 
Teng, KS
Lau, SP 
Issue Date: 2012
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry, 2012, v. 22, no. 42, p. 22378-22381 How to cite?
Journal: Journal of materials chemistry 
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.
URI: http://hdl.handle.net/10397/13627
ISSN: 0959-9428
EISSN: 1364-5501
DOI: 10.1039/C2JM35305A
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