Characterization of a white-colour DBD-driven cadmium bromide exciplex lamp

• Published in: Plasma sources science & technology 2010-10, Vol.19 (5), p.055014-055014
• Main Authors: Guivan, Mykola M, Guyvan, Anna M
• Format: Article
• Language: English
• Subjects: Cadmium; Dibromides; Discharge; Discharge lamps; Electric discharges; Electric potential; Exact sciences and technology; Lamps; Other gas discharges; Physics; Physics of gases, plasmas and electric discharges; Physics of plasmas and electric discharges; Rare gases; Spectra; Voltage pulses
• ISSN: 0963-0252; 1361-6595
• DOI: 10.1088/0963-0252/19/5/055014

The emission spectra from an atmospheric-pressure gas-discharge plasma in mixtures of cadmium dibromide vapour with gases (Ne, Ar, Kr, Xe and N2), as well as the temporal characteristics of voltage and current, have been investigated. A dielectric barrier discharge at a repetition frequency of sinusoidal voltage pulses up to 140 kHz was used to create the gas-discharge plasma. The discharge radiation has been analysed in the spectral range 200--900 nm with a resolution of 0.05 nm. In the spectra, the study has revealed radiation from CdBr(B--X, C--X) exciplex molecules, atomic lines of cadmium and rare gases, and in mixtures with xenon, radiation of XeBr(B--X, B--A) exciplex molecules. The most intense CdBr(B--X) radiation was observed in CdBr2/Xe mixtures. A discharge radiation of a silvery-white colour was observed when the temperature of the mixture was above 250 degree C. The XeBr(B--X) radiation predominated in the spectra at temperatures of the mixture up to 200 degree C. A further increase in the temperature resulted in the prevalence of the CdBr(B--X) radiation. Regularities in the spectral characteristics of the radiation from the gas-discharge plasma are discussed. The high-frequency atmospheric-pressure barrier discharge in mixtures of cadmium dibromide with gases can be used in multiwave exciplex lamps, operating in the UV and visible regions.