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Abstract:
Fine structures of the luminescence bands 3T2(F)→3T1(F) of Ni2+ and 2E(D)→2T2(D) of Ni+ in ZnTe bulk crystals are presented. A threefold split zero-phonon line near 3840 cm-1 is assigned to Ni2+
and a main line at 3095 cm-1 followed by a low-energy statellite in a
distance of 400 cm-1 to Ni+. A comparison with other host crystals reveals an almost linear dependence of the transition energies on the
band gap. Charge-transfer energies are deduced from excitation spectra.
