Ultraviolet-Cathodoluminescent 330 Nm Light Source From A 2-Inch Wide Cnt Electron-Beam Emission Under Dc Electric Field

We report a 2-inch wide-area AlGaN-based ultraviolet (UV) - cathodoluminescence (CL) light source emission using electron beam (EB) pumped source under DC electric field from an AlGaN/GaN multi-quantum-well grown on a sapphire substrate. The EB-pumping is achieved by wide-area carbon nanotubes (CNT) based field emitters and is arranged via a metal mesh, thereby acting as a gate to pump the electron flow. We have carried out UV-CL measurements with a turn-on field emission in the anode voltage ranging between 5 kV and 9 kV at anode current up to 1 mA. The best results are obtained at the low consumption energy of 7 W (anode current 1 mA; anode voltage 7 kV). The 330 nm UV-CL emission shows an output power of -225 mW, with an as-calculated power efficiency of -3.6%. The CL measurements show (5-8) % defect luminescence in the visible region.