Abstract
Abstract4f—4f excitation and emission spectra involving various intermanifold transitions are determined for two Tm3+ centres in ZnS crystals by dye‐laser site‐selective measurements at helium temperatures. A crystal‐field analysis together with polarization data indicates that in both cases Tm is located on lattice sites, probably Zn sites. One of the sites (D3) is thought to be in „unperturbed”︁ environment, whereas in the second case (D2) the four nearest‐neighbour atoms are probably replaced by impurity atoms. The excitation and deexcitation mechanisms of the blue 1G4 → 3H6 emission of these centres are studied by site‐selective broad‐band excitation spectra and kinetical measurements. These studies demonstrate that donor‐acceptor pairs involving the two Tm centres as the donors play an important role in the excitation process. Estimates are given of the relevant pair to 4f state transfer rates.
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