Synthesis of ZnS whiskers and their photoluminescence properties

Abstract

ZnS whiskers were successfully synthesized by the chemical vapor deposition method with the assistance of CuS micro-spheres. The composition, morphology and structure of the samples were characterized by X-ray diffraction, X-ray energy dispersive spectroscopy, scanning electron microscopy, and the temperature-dependent photoluminescence (PL) spectrum over a temperature range from 10 to 250 K was studied. The results show that the as-synthesized ZnS whiskers have an average length of 0.3 mm and diameter of 2.5 μm with a cubic zinc-blende structure. There exist three emission bands in the blue, green and yellow regions, and the emission mechanism is discussed. As the temperature increases, the temperature-dependent PL spectrum shows anomalous behavior, where distinct inverted V-shaped characters of blue and green emission integrated intensity and an inconspicuous S-shape of blue emission peak energy are observed. The transition mechanism is discussed.

Thermal growth and luminescence of wurtzite ZnS nanowires and nanoribbons

“…The one at 3.2 eV has been attributed to S interstitial [29]. The band at 2.8 eV has been usually associated with native defects of ZnS, such as sulfur vacancies [29] or zinc vacancies [30]. At lower energies the blue self-activated band of ZnS appears.…”