Luminescence spectroscopy of Silica coated ZnS quantum dots embedded in PVA matrix

We report room temperature luminescence spectra originating from ZnS quantum dots over coated with SiO₂, embedded on polyvinyl alcohol (PVA) matrix. The samples have been prepared by chemical route. Different techniques e.g. UV/VIS absorption spectroscopy; X-Ray diffraction study, high resolution transmission electron microscopy and luminescence study have been adopted for sample characterization. Optical absorption spectra show strong blue shift, which is an indication of strong quantum confinement. X-ray diffraction study and High resolution transmission electron microscopy show the existence of particles within 10 nm. Prepared samples exhibit luminescence such as Zn²⁺ related photoluminescence and efficient low voltage electroluminescence. This result has been utilized to test their applications in electronics as nano light emitting device.