Abstract
AbstractPhotoluminescence spectra, photoluminescence‐excitation spectra, Raman and EPR studies were performed in bulk Zn1–x –y Bex Mny Se solid solutions grown by the high pressure Bridgman method in the range of composition 0 < x < 0.2, 0 < y < 0.2. For low Mn content photoluminescence spectra at low temperatures consist of exciton, “edge” and deep levels emission bands. The main yellow band (2.05 eV) is due to internal transition in Mn2+. The exciton energy gap versus Mn content was determined for Zn1–x –y Bex Mny Se samples with Be content x = 0.05. EPR studies show that the g ‐factor is noticeably larger than the gfree value indicating a large exchange interaction. The decreasing of g ‐factor with increasing Mn concentration in the investigated samples can be explained as due to increasing of spin ordering. Applying the DPPH as a standard, the concentration of unpaired spins per unit weight of the crystal was estimated. Measured at room temperature Raman spectra consist of ZnSe‐like, MnSe‐like and BeSe‐like transverse (TO), longitudinal (LO), transverse (TA) and longitudinal (LA) phonon modes. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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