Abstract
Mercury discharge lamps are often used because of their high efficiency; however, the usage of mercury lamps will be restricted or forbidden for safety and environmental purposes. Finding alternative solutions to suppress mercury is of major interest. The aim of this work is to increase the luminous efficacy of a commercial-free mercury flat dielectric barrier discharge lamp (Planilum, St Gobain) in order to reach the necessary conditions for the lamp to be used as a daily lighting source. The lamp is made of two glass plates separated by a gap of 2 mm. The gap is filled by a neon xenon mixture. The external electrodes made of transparent ITO (indium tin oxide) are deposited on the lamp glass plates. The electrical signal applied to the electrodes generates a UV-emitting plasma inside the gap. Phosphors deposited on the glass allow the production of visible light. The original electrode geometry is plane-to-plane; this induces filamentary discharges. We show that changing the plane-to-plane geometry to a coplanar geometry allows the plasma to spread all over the electrode surface, and we can reach twice the efficacy of the lamp (32 lm/W) as compared to the original value. Using this new electrode geometrical configuration and changing the electrical signal from sinusoidal to a pulsed signal greatly improves the visual uniformity of the emitted light all over the lamp. Electrical and optical parametric measurements were performed to study the lamp characteristics. We show that it is possible to develop a free mercury lamp with an efficacy compatible with lighting purposes.
Highlights
Katharina StapelmannDue to its high environmental toxicity [1,2], it is envisaged to suppress the use of mercury for industrial applications
With the RoHS directive “Restriction of the use of certain hazardous substances in electrical and electronic equipment” which tends to restrict its use inside electronic devices; the directive 2012/19/EU of the European Parliament and of the Council of 4 July 2012 on waste electrical and electronic equipment (WEEE)
(DBD)has hasbeen beenextenextenand studied; it has been shown that the voltage waveform plays an important role in the sivelystudied; studied;itithas hasbeen beenshown shownthat thatthe thevoltage voltagewaveform waveformplays playsananimportant importantrole roleinin sively generation of different discharge regime
Summary
Due to its high environmental toxicity [1,2], it is envisaged to suppress the use of mercury for industrial applications. With the RoHS directive “Restriction of the use of certain hazardous substances in electrical and electronic equipment” which tends to restrict its use inside electronic devices; the directive 2012/19/EU of the European Parliament and of the Council of 4 July 2012 on waste electrical and electronic equipment (WEEE). Sets up procedures for the collection and treatment of mercury-containing devices. Pursuant to directive 2009/125/EC of the European Parliament, the Commission. Regulation 2919/2020 of 1 October 2019 established a laying down ecodesign requirement for light sources for upcoming years. A few free mercury lighting sources are potential candidates to replace mercury lamps as solid-state lighting (SSL) with inorganic light-emitting diode (LED)
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