An efficient and stable fluorescent graphene quantum dot–agar composite as a converting material in white light emitting diodes
- 20 September 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 22 (42), 22378-22381
- https://doi.org/10.1039/c2jm35305a
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.Keywords
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