Visible quantum cutting in green–emitting BaGdF5:Tb3+ phosphors via downconversion
作者： Hsin-Yi Tzeng , Bing-Ming Cheng , Teng-Ming Chen
DOI: 10.1016/J.JLUMIN.2006.01.326
关键词: Photon upconversion 、 Atomic physics 、 Photon 、 Photoluminescence 、 Analytical chemistry 、 Chemistry 、 Excitation 、 Quantum yield 、 Quantum efficiency 、 Emission spectrum 、 Phosphor
摘要: Abstract The visible quantum cutting (QC) under the excitation at 215 and 187 nm in a newly discovered BaGdF5:Tb3+ via downconversion mechanism has been observed investigated. We have measured vacuum ultraviolet (VUV) emission spectra proposed possible mechanisms to rationalize QC effect. In process, one short-wavelength UV or VUV photon absorbed by Tb3+ was found split into more than emitted through cross-relaxation subsequent direct energy transfer between and/or Gd3+ ions, depending on wavelength. On basis of calculations from region obtained, we obtained optimal efficiency as high 168% 180% for green-emitting 187 nm, respectively.
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