ZnS Quantum Dots Based Voltage-Sensing Light-Emitting Device

This article reports the synthesis of ZnS quantum dots (QDs) embedded in polyvinylpyrrolidone matrix via a simple chemical technique and its novel application as a nano-light-emitting device. The synthesized specimen has been characterized by using UV/Vis spectroscopy, X-ray diffraction study, atomic force microscopy, and high-resolution transmission electron microscopy. These studies indicate the sizes of QDs to be within 8 nm. The prepared QD samples have been examined in a fabricated ZnO/QD-based nano-light-emitting device by exploring the variation of electroluminescence (EL) (light emission phenomenon) with supply voltage at room temperature. The almost linear variation of EL intensity with voltage is obtained for a specific range of voltage, which makes ZnS nanoparticles suitable for light-emitting devices.