Luminescence spectra of Eu 2+-containing materials under high pressures

Abstract

Luminescence spectra of Eu 2+-containing materials, EuCl 2 and β-SiAlON(Eu), have been measured under high pressures of up to ∼15 GPa. All the spectra show redshifts with pressure but the rates of the pressure shifts differ greatly depending on the material, indicating that the actual pressure exerted on the Eu 2+ ion is quite different from one material to another even when the applied external pressure is the same. A large pressure shift of ∼−150 cm −1/GPa is observed for EuCl 2 and an extremely small pressure shift of ∼−22 cm −1/GPa is observed for β-SiAlON(Eu).