The room temperature optical and related properties of K_2Cd_3S_4 and similar low-dimensional semiconductors with metal sulfide units are described. The near-band-edge optical absorption and photoluminescence bands dominated by excitonic transitions exhibit blue shifts and the corresponding binding energy values are larger, in comparison to those of the corresponding three-dimensional systems. The results are similar to those obtained from low-dimensional semiconductors based on metal halide units and similar to those of artificial systems based on conventional semiconductors.
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