Investigations of white light emitting europium doped zinc oxide nanoparticles

Abstract

Europium doped zinc oxide nanoparticles have been synthesized using a chemical route. The amount of doped europium was varied which shows the changes in the photoluminescence (PL) intensity. The post synthesis annealing effect on the properties of ZnO nanoparticles has also been investigated. In general, PL is broad and a white light is emitted which originates from ZnO and the intra-4f transitions of Eu3+ ions. The x-ray diffraction patterns do not show any Eu-related peaks for as-synthesized ZnO nanoparticles as well as for annealed samples. X-ray absorption spectroscopy reveals that europium ions are present on the surface of the core of ZnO and inside the shell of zinc hydroxide [Zn(OH2)] after annealing.

Synthesis and characterization of Eu3+, Ti4+@ ZnO organosols and nanocrystalline c-ZnTiO3thin films aiming at high transparency and luminescence

“…Complementary Raman studies are being performed to elaborate these results. As reported by Ashtaputre et al [20], the addition of Eu 3+ does not drastically change the initial ZnO condensation process. The size of the ZnO nanoparticles was estimated at about 4 nm from the wavelength of the bandgap absorption edge and XRD patterns (see S1 and S2 in supporting information given in stacks.…”

Effects of mineralizing agent on the morphologies and photoluminescence properties of Eu3+-doped ZnO nanomaterials

“…9. In the spectrum, the peaks located at 580, 587 and 614 nm are observed, which can be attributed to the 4f-4f intrashell transitions of 5 D 0 → 7 F 0 , 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 of Eu 3+ ions, respectively [62]. Comparing three spectra, it can be seen the intensity of the defect emissions of samples A, B and C are obviously different.…”

Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

“…In order to confirm the charge state (+2, +3) of Eu ions present in the sample, PL The peaks at 420 and 457 nm corresponds to the 5d → 4f transitions of Eu 2+ ion [22,23]. Upon 325 nm excitation (Fig.7b), emission peaks in the range 423 to 484 nm are noticed which are related to Eu 2+ ions.…”