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

Abstract

The emission spectra from an atmospheric-pressure gas-discharge plasma in mixtures of cadmium dibromide vapour with gases (Ne, Ar, Kr, Xe and N 2 ), 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 CdBr 2 /Xe mixtures. A discharge radiation of a silvery-white colour was observed when the temperature of the mixture was above 250 • C. The XeBr(B-X) radiation predominated in the spectra at temperatures of the mixture up to 200 • 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.

Emission characteristics of Xe–RbBr plasma

“…Moreover, many different UV radiation sources, emitting on transitions of exciplex molecules of inert gas halides, have been created. It should be noted that toxic mixtures, such as mixtures with mercury or cadmium vapor [7][8][9], are part of the working mixtures that have proved to be the best in practice. Therefore, despite a lot of existing gas mixtures being used to produce radiation of exciplex molecules, studies of working media on new non-traditional mixtures, in particular, on the xenon-rubidium bromide mixture, which have similar emission properties but contain only non-toxic and environmentally friendly species, are of interest.…”

Optical and electrical characteristics of air dielectric barrier discharges in mode transition at atmospheric pressure

“…Dielectric barrier discharges (DBDs) at atmospheric pressure have attracted considerable attention over the last few decades due to their low-cost processing, their nearly arcfree operation, and their many industrial applications, such as industrial ozone generation [1], sterilization [2], pollution abatement [3], plasma-chemical vapor deposition and surface activation [4], surface modification of diverse materials [5], and as DBD lamps [6]. DBDs are typically non-thermal plasma sources in which the discharges are sustained between electrodes, where at least one electrode is covered by a dielectric [1].…”

Very large-scale gap distances of atmospheric pressure dielectric barrier glow discharge using semiconductor materials

“…The dielectric barrier discharge (DBD) at atmospheric pressure is one of the methods for producing nonequilibrium plasma for which there are the wide applications, including industrial ozone generation [1], sterilization [2], pollution abatement [3], plasma chemical vapor deposition and surface activation [4], surface treatment of materials [5], thin film deposition [6], and so on [7][8][9][10][11]. Compared with the filamentary discharge at atmospheric pressure, the productive efficiency of active particles is higher in the uniform discharge [12][13][14].…”