Vertically Aligned ZnO and ZnS Quantum Dot Based Hybrid White LED

An organic/inorganic hetrojunction light emitting device consisting of quantum dots and conjugate polymers in a stacked layer configuration is reported. The device structure was fabricated using spin coating on a glass substrate coated with a transparent and conducting indium titanium oxide. The quantum dots were synthesised using a low temperature wet chemical route. The structure, morphology and optical properties of the constituent layers have also been examined. It is shown that the quantum dots form a compact layer of vertically aligned rod like structure. The current-voltage behaviour of the hetrojunctions showed good rectifying characteristics. A broad white light emission band ranging from 350-650 nm was observed in the electroluminescence spectra of the device.