Electroluminescence in Zinc Sulfide Single Crystals

抄録

By using the vapor-phase synthesis method, zinc sulfide single crystals were grown of pure zinc and bomb hydrogen sulfide and they were doped with two impurities, copper and chlorine.
The brightness waves of E. L. in these crystals were studied by applying rectangular pulse voltage.
Since the E. L. of “in phase” was dominant in the crystals lacking chlorine and having appreciable voltage-dependency, it was concluded that it occurred as a result of the injection of electrons from the cathode.
In order to classify the mechanism of E. L. of “out of phase,” infrared quenching of E. L. was used. E. L. in ZnS:Cl, Cu was typical case sensitive to the quenching, and E. L. in artificial junction (ZnS:Cl–ZnS:Cu) was the typical case insensitive to the quenching. It was supposed that the difference between these two cases resulted from the difference in the mechanism supplying the primary electrons of E. L.