Optical properties of Cr-doped Zn_(1-x)Mn_xTe semimagnetic nanocrystals

摘要

The effect of Cr co-doping on the optical properties of Mn-doped ZnTe nanocrystals ( NCs) embedded in a glass matrix is studied in this paper. The substitutional incorporation of Cr2+ ions into these semiconducting NCs was strongly evidenced by optical absorption and crystal field theory analyses, which showed the characteristic transitions of Cr2+ and Cr3+ ions. Transmission electron microscopy images revealed the NC size and invariance lattice parameter, with the incorporation of Mn2+ and Cr2+ ions. PL spectra showed that co-doping with Cr favors a competition between Mn2+ and Cr2+ ions, resulting in a decrease in the rate of Mn2+ substitution, zinc vacancy filling (V-Zn) in Zn1-x-yMnxCryTe NCs, and the formation of interstitial Cr3+ ions in the host glass system. Published by AIP Publishing.