The enhancement of the low absorption cross section and widening of the absorption range of the RE ions in the UV-blue region is still a challenge to develop optical systems with high performance. In this work we synthesized Bi- and Er-codoped Y2O3 nanocrystals by means of Pechini type sol-gel process. X-ray powder diffraction (XRPD) and transmission electron microscopy (TEM) were performed to evaluate the nanocrystalline particle size and phase. Photoluminescence investigation in the UV–vis and IR regions showed that the presence of Bi3+ ions promotes the strengthening of Er3+ emitter properties. In particular, an Er3+ sensitization process based on a broadband energy transfer mediated by the Bi3+ ions in the C2 site was evaluated, resulting in a wavelength spread for the photostimulation of the rare earth emissions in the visible and NIR range. We pointed out a resonant type via a dipole-dipole interaction as the most probable mechanism of energy transfer. Moreover, the critical distance between the Bi3+ and Er3+ ions was estimated to be of about 8.5 Å.

The enhancement of the low absorption cross section and widening of the absorption range of the RE ions in the UV-blue region is still a challenge to develop optical systems with high performance. In this work we synthesized Bi- and Er-codoped Y2O3 nanocrystals by means of Pechini type sol-gel process. X-ray powder diffraction (XRPD) and transmission electron microscopy (TEM) were performed to evaluate the nanocrystalline particle size and phase. Photoluminescence investigation in the UV-vis and IR regions showed that the presence of Bi3+ ions promotes the strengthening of Er3+ emitter properties. In particular, an Er3+ sensitization process based on a broadband energy transfer mediated by the Bi3+ ions in the C-2 site was evaluated, resulting in a wavelength spread for the photostimulation of the rare earth emissions in the visible and NIR range. We pointed out a resonant type via a dipole-dipole interaction as the most probable mechanism of energy transfer. Moreover, the critical distance between the Bi3+ and Er3+ ions was estimated to be of about 8.5 angstrom.

Energy Transfer in Bi- and Er-Codoped Y2O3 Nanocrystals: An Effective System for Rare Earth Fluorescence Enhancement

BACK, MICHELE;TRAVE, Enrico;MARIN, RICCARDO;MAZZUCCO, NICOLO';;RIELLO, Pietro
2014

Abstract

The enhancement of the low absorption cross section and widening of the absorption range of the RE ions in the UV-blue region is still a challenge to develop optical systems with high performance. In this work we synthesized Bi- and Er-codoped Y2O3 nanocrystals by means of Pechini type sol-gel process. X-ray powder diffraction (XRPD) and transmission electron microscopy (TEM) were performed to evaluate the nanocrystalline particle size and phase. Photoluminescence investigation in the UV–vis and IR regions showed that the presence of Bi3+ ions promotes the strengthening of Er3+ emitter properties. In particular, an Er3+ sensitization process based on a broadband energy transfer mediated by the Bi3+ ions in the C2 site was evaluated, resulting in a wavelength spread for the photostimulation of the rare earth emissions in the visible and NIR range. We pointed out a resonant type via a dipole-dipole interaction as the most probable mechanism of energy transfer. Moreover, the critical distance between the Bi3+ and Er3+ ions was estimated to be of about 8.5 Å.
File in questo prodotto:
File Dimensione Formato  
JPCC_118(2014)30071.pdf

non disponibili

Licenza: Accesso chiuso-personale
Dimensione 3.68 MB
Formato Adobe PDF
3.68 MB Adobe PDF   Visualizza/Apri

I documenti in ARCA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10278/3616275
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 42
  • ???jsp.display-item.citation.isi??? 39
social impact