Photoluminescence study of CuInS2 : Yb3+ under high magnetic fields

Photoluminescence spectra of a bulk single crystal of Yb-doped CuInS2 have been investigated in a high magnetic field up to 25 T. Sharp luminescence p eaks are assigned to the intra-4f-shell transitions of Yb3+. A crystal-fiel d level diagram has been proposed from the peak energy of the spectra. Thes e peaks are found to split into several peaks on applying magnetic field du e to the Zeeman effect. The splitting of peaks increases linearly to the fi eld up to 20 T, and deviates from the linearity above 20T, which is interpr eted as a result of mixing between the crystal-field levels. (C) 2001 Elsev ier Science B.V. All rights reserved.