Preparation, characterization and high quantum efficiency of yellow-emitting CsVO3 nanofibers

Abstract

The self-activated yellow-emitting CsVO3 nanofibers were prepared by the hydrothermal reaction method. The structural refinement was conducted on the base of XRD measurement. The surface properties of the CsVO3 nanofibers were investigated using Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Energy Dispersive Spectrometry (EDS). One of the morphological characterizations is the high length–diameter ratio with diameters of 100–150 nm and lengths of tens of micrometers. The UV–vis absorption spectrum and the electronic band structures of CsVO3 nanofiber show a direct allowed electronic gap with band energy of 2.997 eV. The luminescence properties such as photoluminescence spectra, decay lifetime, color coordinates and the absolute internal quantum efficiency (η) were studied. Notably, CsVO3 nanofibers present a bright yellow luminescence with a high quantum efficiency of 85%. It is suggested that CsVO3 nanofibers could be used for efficient lighting and display.