High-frequency electrodeless lamps in argon–mercury mixtures

Abstract

In this paper, numerical and experimental investigations of high-frequency (HF) electrodeless lamps in argon–mercury mixtures are performed. The intensities of the mercury spectral lines having wavelengths λ = 404.66, 435.83, 546.07 nm (7 3S1–6 3P0,1,2) and the resonance line λ = 253.7 nm (6 3 P1–6 1S0) are measured at a wide range of mercury pressures, varying the HF generator current and argon filling pressure. A stationary self-consistent model of HF electrodeless discharge lamp is developed including kinetics of the excited mercury and argon atomic states. Based on the developed model, the radiation characteristics of the discharge plasma are calculated. Numerical simulation of the line intensities behaviour in dependence on the mercury pressure, HF generator current and argon filling pressure is performed. The model results are in qualitative agreement with the experimental data. The calculations of the relative intensities of the visible triplet lines 7 3S1–6 3P0,1,2 are presented for the first time in this paper.

Analysis of Discharge Characteristics of Flat Fluorescent Lamps for a Large Area Backlight Unit using a Two-Dimensional Fluid Simulation

“…The fluid model consists of a set of fluid equations for electrons, ions (Hg þ , Ar þ , and Ne þ ), and excited state neutrals such as Hg à ( 3 P 1 ), Hg à ( 1 P 1 ), Hg à ( 3 P 0 ), Hg à ( 3 P 2 ), Hg Ãà , Ar à , and Ne à . 16,18,21) The densities of charged particles are coupled self-consistently with Poisson's equation. The Hg, Ar, and Ne gas densities are assumed to be uniformly distributed according to a specified neutral pressure in the FFL.…”

“…14) A global model for a Hg-rare gas discharge was developed by Polman et al, 15) and they calculated the dynamics of electrons and resonant-level neutrals. Loo et al 10) and Denisova et al 16) studied lamp discharges of a low-pressure Hg-Ar mixture with cylindrical geometry and presented a current-voltage characteristic diagram and electron density profiles of the sustained discharge respectively. A onedimensional model was developed by Stambouli et al, 17) and a two-dimensional simulation of the electrodeless lamp discharges containing a Hg-Ar mixture was simulated by Rajaraman and Kushner.…”

Plasma Diagnostics Using Computed Tomography Method

“…Plasma sources such as arcs or ICPs at atmospheric or more pressures produce thermal plasmas which are mainly applied for light sources and in plasma-chemical technologies [1]- [3]. Low-pressure nonequilibrium plasma sources such as glow, RF, and microwave discharges are used as ion sources for particle acceleration, for deposition and etching in the microelectronic industry, and for lighting technology [4]- [6]. There is a class of highpressure discharges which are also not in equilibrium [7].…”

Modelling of Atomic Spectra Emitted by Light Sources Based on an Inductive Discharge

“…For optimization of light sources and understanding processes taking place in plasma generated in an inductive discharge one needs correct and efficient calculation methods. Different numerical methods were suggested for plasmaparameter calculations in high-frequency electrodeless discharge lamps (see works [2][3][4] and references therein). The method of self-consistent solution for the plasmafield system in a high-frequency electrodeless discharge was proposed in works 5,6) for helium plasma and in work 7) for argon plasma.…”

“…The method of self-consistent solution for the plasmafield system in a high-frequency electrodeless discharge was proposed in works 5,6) for helium plasma and in work 7) for argon plasma. In works 3,4) , a 1D self-consistent model with the assumption of the Maxwellian electron energy distribution function was used for argonmercury lamps. A number of papers were dedicated to the study of the influence of the electric field frequency and strength on spectral line intensities and the emission colour of lamps (see, for example, work 8) and references therein).…”