Optical properties of the system Zn1-xMnxIn2S4

The crystalline structure of cuaternary alloys Zn1-xMnxIn2S4 beyond to the spatial group (Rm). The optical properties of the semimagnetic semiconducto rs family Zn1-xMnxIn2S4 are studied in this work by two techniques, optical absorption and photoluminiscence, to clarify their possible applications an d their optical characterization in the visible region, because it is a wid e gap energy material. It has been found that this compound accepts Mn conc entration up to x = 0.47 without alters its rombohedral phase and it provid es a wide range to adjust the gap. The gap of the alloys was determined fro m the optical absorption measurements for a systematic variation of the Mn concentration of x = 0.06, 0.17, 0.36, 0.45, 0.47, at 300 K and 25 K. The g aps vary with the concentration in 2.45, 2.08, 2.03, 2.14, and 2.10 eV at 3 00 K, respectively The real composition of the alloys was determined by the energy dispersion microanalysis technique EDX. Transitions of ion Mn+2 in its levels d(T-4(1) --> (6)A(1)) was found from electroluminiscence measure ments. T-4(1) splitting this degenerate level in two levers T-7 and Gamma(8 ) that explain the narrow photoluminiscence band in 1.86 and 1.87 eV al 25 K. These bands are invariant with the temperature and concentration.