Abstract

In this contribution, steady-state and time-resolved photoluminescence spectra of β-Si5.9Al0.1O0.1N7.9/Pr3+0.016 obtained at high hydrostatic pressures up to 260 kbar are presented. At ambient pressure, excitation spectra of the β-SiAlON/Pr3+ luminescence consist of sharp lines in the spectral region of 20000–22200 cm–1 related to the 3H4 → 3P0,1,2 transitions and a broad band with two maxima peaking at 30300 and 35700 cm–1, which are related to the ionization of Pr3+ ions occupying two different crystallographic sites in the β-SiAlON lattice. In both sites, the luminescence spectra consist of the dominant 1D2 red emission and 3P0 blue emission of Pr3+ ions. The intensity of luminescence related to transitions from the 3P0 state and the respective decay time gradually decreases when the pressure increases. The intensity of emission from the 1D2 state is independent of the pressure and remains strong over the entire pressure range. Weak dependence of the Pr3+ emission on applied pressure can be related to the covalent and strong Pr–N bonds and specific location of Pr3+ ions occupying empty lattice points in β-SiAlON.

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