White light emission from rare earth activated yttrium silicate nanocrystalline powders and thin films

J. A. Gonzalez-Ortega, E. M. Tejeda, N. Perea, G. A. Hirata, E. J. Bosze, J. McKittrick

Research output: Contribution to journalConference articlepeer-review

47 Scopus citations

Abstract

We present a potential rare earth activated white-emitting nanocrystalline phosphor powders produced by combustion synthesis and report their luminescent properties and thin films deposited by pulsed laser ablation. Effects of varying the atomic concentration of rare earth dopants in Y2SiO 5:Cex,Tby (0.0065 < x < 0.0085, 0.010 < y < 0.040), along with morphological, microstructural and photoluminescence (PL) properties were investigated in order to produce white-light emission close to D65 with optimized luminescent efficiency. Characteristic electronic transitions measured from photoluminescence spectra at λem = 544 nm (5D 47F5) in Tb3+ and λem = 418 nm (5d → 2F7/2) in Ce3+ show that an inductive energy transfer occurs when Tb 3+ ions absorbs the energy from Ce3+ upon excitation with long-UV photons (λexc = 358-380 nm). The optimal concentration for the best luminescence intensity has been obtained in Y 2SiO5:Ce0.0075,Tb0.025, and the closest to daylight white emission was found with a composition of Y 2SiO5:Ce0.0075,Tb0.040. These activated phosphors with two rare earth ions in the yttrium silicate host (Y2SiO5) represent an efficient way to produce white-light emission close to D65 with chromaticity coordinates of x = 0.225 and y = 0.320.

Original languageEnglish (US)
Pages (from-to)1221-1227
Number of pages7
JournalOptical Materials
Volume27
Issue number7
DOIs
StatePublished - Apr 2005
EventProceedings of the First Topical Meeting on Nanostructured Materials and Nanotechnology CIO 2004 -
Duration: Sep 22 2004Sep 24 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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