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 publicationJournal articleAcademic researchpeer-review

141 Citations (Scopus)


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 languageEnglish
Pages (from-to)22378-22381
Number of pages4
JournalJournal of Materials Chemistry
Issue number42
Publication statusPublished - 14 Nov 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this