We have prepared high quality crystals of pure SrI2 and Eu-doped SrI2 by our original “Liquinert” process and investigated their luminescence properties. Under the excitation with the 193nm light of an ArF excimer laser, which corresponds to the wavelength above the bandgap of SrI2 bulk crystals, the pure and Eu doped SrI2 crystals exhibit no luminescence band related to defects or impurities around 560nm. This fact indicates that the crystals prepared by the “Liquinert” process contain lower defects and/or impurities. When the Eu-doped SrI2 crystals are excited with the 325nm light of a He–Cd laser, only the luminescence band due to the 5d→4f transition in the Eu2+ ions is observed around 425nm. The 425nm band observed at a forward configuration exhibits the shift to the longer wavelength side and the decrease of the luminescence intensity with increasing Eu concentration. The Eu concentration dependences of the peak wavelength and luminescence intensity are simulated on the basis of a simple self-absorption model.
Journal of Luminescence – Elsevier
Published: Aug 1, 2016
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