Diagnostics of Planar XeI^* UV Exciplex Lamp Excited by Coplanar Surface Barrier Discharge

Abstract

In this contribution to the research, electrical, optical, as well as energetic properties of the coplanar surface barrier discharge (CSBD) operated with the Xe/I₂ and Kr/Xe/I₂ mixtures at pressures of p (Xe)≤ 50 kPa and p (Kr/Xe) = 10 - 100 kPa are presented. Varying the gas composition, pressure and pump pulse repetition rate makes it possible to control the discharge pattern and achieve a diffuse discharge or completely filamentary CSBD. The optimal UV output was obtained using Xe/I₂ = 20/0.04 kPa and Kr/Xe/I₂ = 46/4/0.04 kPa mixtures. The krypton admixture enhances the Xel(B-X) emission for about 15% in comparison with a binary Xe/I₂ mixture. The average radiation power and efficiency of 8 mW/cm² and 3% were measured at a frequency of 100 kHz.