Graphene Oxide-Phosphor Hybrid Nanoscrolls With High Luminescent Quantum Yield: Synthesis, Structural, and X-ray Absorption Studies

ACS Appl Mater Interfaces. 2015 Mar 18;7(10):5693-700. doi: 10.1021/am507342w. Epub 2015 Mar 4.

Abstract

Highly luminescent graphene oxide (GO)-phosphor hybrid thin films with a maximum quantum yield of 9.6% were synthesized via a simple chemical method. An intense luminescence emission peak at 537 nm and a broad emission peak at 400 nm were observed from the GO-phosphor hybrid films. The maximum quantum yield of the emissions from the hybrid films was found to be 9.6%, which is 48 times higher than that of pristine GO films. The GO-phosphor hybrids were prepared via spin-coating and subsequent postannealing of the films, resulting in scrolling of the GO sheets. The resulting GO nanoscrolls exhibited a length of ∼2 μm with nanoscale interior cavities. Transmission electron microscopy and selected-area electron diffraction analyses revealed that the lattice structure of the tubular scrolls is similar to that of carbon nanotubes. While pristine GO films are p-type, in the GO-phosphor hybrids, the Fermi level shifted upward and fell between the HOMO-LUMO gap due to phosphor attachment via C-N bonding. The highly luminescent GO-phosphor hybrids will find important applications in graphene-based optoelectronic devices.

Keywords: X-ray absorption; carbon nanotubes; graphene oxide; nanoscrolls.

Publication types

  • Research Support, Non-U.S. Gov't