The CdSe nanocrystalline powder and nanocomposite films were characterized by for morphology and structure by transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. TEM studies were performed with a Techani 20 G2 transmission electron microscope, operating at 200 kV. XRD was taken on a Rigaku Rotating Anode (H-3R) diffractometer using Cu(Kα) radiation with accelerating voltage 40 kV. Optical properties of CdSe nanocrystal and composite films were studied through optical absorption and photo-luminescence (PL) measurements. UV–visible absorption spectra were obtained with Perkin-Elmer λ12 spectrometer and photoluminescence studies were performed by a fluorescence spectrometer of Perkin Elmer LS-55 fluorescence spectrometer with 150 W Xe lamp source for excitation and double ¼ cm monochromators for both excitation and detection.
For electro-luminescence (EL) investigations EL cells were fabricated by depositing emissive layer on SnO2 coated conducting glass plate. The conduction glass plates were prepared by depositing a layer of SnO2 over heated glass plates using chemical vapor deposition technique. A thin mica sheet having small window of 2×2 mm2 was fixed over emissive layer and an aluminum strip was fixed over it. For electroluminescence studies A.C. voltage of various frequencies was applied at conducting glass plate and aluminum electrodes using EL power supply with audio frequency generator. EL brightness at different voltages and frequencies was measured by a photomultiplier tube connected to a picoammeter. EL spectra were obtained with the help of grating monochromator and photomultiplier tube.