IMPROVED LUMINESCENCE OF CU DOPED ZNTE QUANTUM DOTS IRRADIATED WITH 120 MEV FE3+ IONS

Cu-doped ZnTe quantum dots (ZnTe: Cu QDs) have been irradiated with 120 MeV Fe3+ swift heavy ions (SHIs). Irradiated samples cover the important green window for nano light emitting devices at 560 to 569 nm. X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM) and scanning electron microscope (SEM) studies have been carried out on the SHI irradiated ZnTe: Cu quantum dots. UV-Vis absorption spectroscopy reveals that absorption edges of irradiated samples are little bit red shifted with respect to the unirradiated sample. Moreover, intense luminescent peaks (FL & EL) are observed at green region for the irradiated samples. Significantly, better luminescent peaks are achieved at the same wavelength for the irradiated samples.