Sensitisation of the luminescence of Er3+ and Ho3+ ions by Cr4+ ions in a Y2SiO5 crystal

The luminescence of Er³⁺ and Ho³⁺ ions was sensitised by Cr⁴⁺ ions in an yttrium orthosilicate Y₂SiO₅ (YSO) crystal. The luminescence spectra of YSO:C:Er and YSO:Cr:Ho crystals and the kinetics of the luminescence of the Cr donor ions were investigated at 77 K and 300 K and analysed. Radiative energy transfer from Cr⁴⁺ to Ho³⁺ was observed in a Y₂SiO₅:0.2% Cr 0.5% Ho crystal. The Cr⁴⁺—Er³⁺ energy transfer in a Y₂SiO₅4+ to Er³⁺ was estimated to be 14% — 19% at 77 K.