Synthesis of Single-Crystalline Hexagonal Graphene Quantum Dots from Solution Chemistry

Seok Hwan Lee, Do Youb Kim, Jaemin Lee, Seul Bee Lee, Hyun Han, Young Yun Kim, Sung Cik Mun, Sang Hyuk Im, Tae Ho Kim, O. Ok Park

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


Graphene-based carbon nanostructures with nanometer dimensions have been of great interest due to the existence of a bandgap. So far, well-ordered edge structure and uniformly synthesized graphene quantum dots (GQDs) with a hexagonal single-crystalline structure have not been directly observed owing to the limited precision of current synthesis approaches. Herein, we report on a novel approach not just for the synthesis of the size-controlled single-crystalline GQDs with hexagonal shape but also for a new discovery on constructing 2D and 3D graphene single crystal structures from d-glucose via catalytic solution chemistry. With size-controlled single-crystalline GQDs, we elucidated the crucial role of edge states on luminescence from the correlation between their crystalline size and exciton lifetime. Furthermore, blue-emissive single-crystalline GQDs were used as an emitter on light-emitting diodes and exhibit stable deep-blue emission regardless of the voltage and doping level.

Original languageEnglish
Pages (from-to)5437-5442
Number of pages6
JournalNano Letters
Issue number8
Publication statusPublished - 2019 Aug 14

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.


  • Graphene quantum dots
  • bottom-up synthesis
  • deep-blue electroluminescence
  • hexagonal structure
  • single-crystalline

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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