Issue 42, 2012
From the journal:

Journal of Materials Chemistry

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

C. M. Luk,a   L. B. Tang,a   W. F. Zhang,a   S. F. Yu,a   K. S. Tengb  and  S. P. Lau*a  

* Corresponding authors

a Department of Applied Physics, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
E-mail: apsplau@polyu.edu.hk

b Multidisciplinary Centre, College of Engineering, University of Swansea, Singleton Park, Swansea SA2 8PP, UK

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

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Article information

DOI
https://doi.org/10.1039/C2JM35305A
Article type
Communication
Submitted
08 Aug 2012
Accepted
20 Sep 2012
First published
20 Sep 2012

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

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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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