Studies on CdSe/PVK nanocomposites films for electroluminescent display applications

Abstract In the present work, the thin films of CdSe/PVK nanocomposites with various concentration of CdSe have been synthesized by chemical route. Polyvinyl carbazole (PVK) was used as a stabilizer as well as host matrix to prevent agglomeration of nanoparticles. The synthesized CdSe/PVK films were characterized by X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), UV–Visible absorption spectra. The crystalline size was calculated from the XRD while FESEM images confirm the surface morphology of CdSe/PVK nanocomposites. CdSe nanocrystals have hexagonal phase and size increases with increasing CdSe content, Single PL peak at 498 nm for all the samples is caused by luminescence centres or surface/defect states. The EL spectra are quite broad as compared to PL spectra and the peaks are obtained at nearly same wavelength. The EL peak intensity increases slightly and shifts towards red by increasing concentration of CdSe in polymer matrix.