Laser Diagnostics of Mercury-free Fluorescent Lamps for Investigation of Effects of the Auxiliary External Electrode

概要

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The fluorescent lamps are widely used for general lighting because of their high efficacy, long life and so forth. However, fluorescent lamps in general contain mercury, which has a possibility to cause environmental problems. So we have been developing fluorescent lamps that contain only rare gases in place of mercury. The rare gas lamps are environmentally friendly, but its luminous flux and efficacy were lower than those of mercury lamp. Therefore, we have tried improving luminous flux of the rare gas lamp by expanding positive column. By winding an external electrode on the outside wall of the lamp that has multi anodes and single cathode, positive column expanded and luminous flux increased. The increase of metastable atoms and expansion of its radial distribution was confirmed by laser induced fluorescence method. It is found that the external electrode has an effect of field distortion leading to the positive column expansion. Finally, by connecting large resistance to limit the current flowing through external electrode, power consumption decreased and luminance of 13 000 cd/m2 and luminous efficacy of 90 lm/W are obtained, which are comparable with those of mercury fluorescent lamps.
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