Preparation and Properties of II-Ln[sub 2]-S[sub 4] Ternary Sulfides

Some 50 ternary sulfides of the type were explored, where and . The structure of the compounds, if they were formed, was investigated with x‐ray diffraction techniques using primarily the materials synthesized in powder form. Single crystals were subsequently grown from the powders for several compounds including and which were found to have bandgaps of 2.1 and 2.3 eV, respectively, at room temperature. Doping with a variety of impurities provided conducting n‐type specimens for both and , and for the latter p‐type specimens were also obtained. Weak cathodoluminescence was observed from several compounds including with a green‐yellow and with a blue‐green emission color.