Effect of Ho Co-Doping on the Long Lasting Emission of CaGa2S4:Eu

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概要

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• To investigate the long-lasting green afterglow from Ho added CaGa2S4:Eu compounds, photoluminescence (PL) and photoluminescence excitation (PLE) spectra are measured as a function of Ho concentration by keeping Eu one at 0.1 and 0.5 mol %. As Ho concentration increases, PL intensity of Eu decreases. PL from Ho at 660 nm has an additional broad excitation band ranging from 400 to 500 nm, emerging only if Eu2+ ion is co-doped. Since this new band just coincides with the Eu2+ emission in energy, electrons excited to the 5d states of Eu2+ are considered to transfer to the Ho excited states, which are actually confirmed by the weakened Eu emission observed. In the decay curve of Eu emission in a co-doped sample, two long-lasting components are observed. Their lifetimes, however, steeply decrease when Ho concentration increases more than 1 mol %. In this paper, energy transfer between the two dopants is discussed.

• 2011-05-25

著者

• Hidaka Chiharu

  Department of Physics, College of Humanities and Sciences, Nihon University, Setagaya, Tokyo 156-8550, Japan

関連論文

• Effect of Ho Co-Doping on the Long Lasting Emission of CaGa2S4:Eu
• Effect of Rare Earth Element Codoping on the Mn Red Emission in Ca and Sr Thiogallates: Focusing on Its Mechanism through Electron Spin Resonance Study of Single Crystals
• Analysis of the Enhancing Effect of Rare Earth Ion Co-Doping on the Red Emission of CaGa2S4:Mn2+ in View of Its Decay Time

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