Efficient Solid-State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC-Electroluminescent Device

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Minsu Park
  • Hyewon Yoon
  • Jaeho Lee
  • Jungmo Kim
  • Jinho Lee
  • Seong-Eui Lee
  • Seunghyup Yoo

Detail(s)

Original languageEnglish
Article number1802951
Journal / PublicationAdvanced Materials
Volume30
Issue number38
Online published7 Aug 2018
Publication statusPublished - 20 Sept 2018
Externally publishedYes

Abstract

Emerging graphene quantum dots (GQDs) have received much attention for use as next-generation light-emitting diodes. However, in the solid-state, π-interaction-induced aggregation-caused photoluminescence (PL) quenching (ACQ) in GQDs makes it challenging to realize high-performance devices. Herein, GQDs incorporated with boron oxynitride (GQD@BNO) are prepared from a mixture of GQDs, boric acid, and urea in water via one-step microwave heating. Due to the effective dispersion in the BNO matrix, ACQ is significantly suppressed, resulting in high PL quantum yields (PL-QYs) of up to 36.4%, eightfold higher than that of pristine GQD in water. The PL-QY enhancement results from an increase in the spontaneous emission rate of GQDs due to the surrounding BNO matrix, which provides a high-refractive-index material and fluorescence energy transfer from the larger-gap BNO donor to the smaller-gap GQD acceptor. A high solid-state PL-QY makes the GQD@BNO an ideal active material for use in AC powder electroluminescent (ACPEL) devices, with the luminance of the first working GQD-based ACPEL device exceeding 283 cd m−2. This successful demonstration shows promise for the use of GQDs in the field of low-cost, ecofriendly electroluminescent devices.

Research Area(s)

  • AC-electroluminescent device, boron oxynitride, GQDs, graphene quantum dots, photoluminescence

Citation Format(s)

Efficient Solid-State Photoluminescence of Graphene Quantum Dots Embedded in Boron Oxynitride for AC-Electroluminescent Device. / Park, Minsu; Yoon, Hyewon; Lee, Jaeho et al.
In: Advanced Materials, Vol. 30, No. 38, 1802951, 20.09.2018.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review