Development of microplasma based UV sources using diamond nanostructured cathodes

In this study we have developed a near Ultra Violet (NUV) source by using discharge of Ar + N₂ gas mixture with employ of DC power source. The cathode materials play vital role in efficiency and lifetime of UV sources, which are attained from micro-discharges of various gas compositions. In the present study, micro discharges are conducted in the cavity, which have been architecture by using cylindrical diamond nanotips cathode and ITO coated glass anode. The NUV emission (330 to 400 nm) from the N₂ (C-B transition) observed at pressure of 10 torr by applying the DC power of 30-120 mW. The NUV emissions have collected by optical emission spectrometer. The NUV emission intensities increased as function of power at constant pressure. Moreover the devices tested at low pressures and powers in non-harsh gas environment.