Title: Visible quantum cutting in green-emitting BaGdF5 : Tb3+ phosphors via downconversion
Authors: Tzeng, Hsin-Yi
Cheng, Bing-Ming
Chen, Teng-Ming
Department of Applied Chemistry
Keywords: quantum cutting;phosphors;photo luminescence spectra;quantum efficiency
Issue Date: 1-Jan-2007
Abstract: The visible quantum cutting (QC) under the excitation at 215 and 187nm in a newly discovered BaGdF5:Tb3+ via downconversion mechanism has been observed and investigated. We have measured the vacuum ultraviolet (VUV) excitation and emission spectra and proposed possible mechanisms to rationalize the observed QC effect. In QC process, one short-wavelength UV or one VUV photon absorbed by Tb3+ was found to split into more than one visible photon emitted by Tb3+ through cross-relaxation and subsequent direct energy transfer between Tb3+ and Tb3+ and/or Gd3+ ions, depending on the excitation wavelength. On the basis of the calculations from the emission spectra in the visible region obtained, we have obtained optimal quantum efficiency as high as 168% and 180% for green-emitting BaGdF5:Tb3+ under excitation at 215 and 187 nm, respectively. (c) 2006 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jlumin.2006.01.326
ISSN: 0022-2313
DOI: 10.1016/j.jlumin.2006.01.326
Volume: 122
Begin Page: 917
End Page: 920
Appears in Collections:Conferences Paper

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