JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Special Issue: Electrode for Fluorescent Lamp and the Technology Trend
Measurement of Work Function of Electrodes in Low Pressure Hg Discharge Lamps Using Photoelectric Effect
Shigeo GotohMotoi Wada
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2008 Volume 92 Issue 11 Pages 762-768

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Abstract

The work function of an oxide-coated tungsten filament in low pressure Hg discharge lamps was measured using the photoelectric effect with and without discharge. The plasma had been excited in a lamp with 2.45-GHz microwaves to reduce the power loading to the electrodes, which made the measurement of photoelectric current from the electrodes possible in plasma. Lasers with wavelengths of 325, 405, 532, and 633 nm irradiated the surface of the electrodes to induce photoelectric current. The work function of the electrode of an as-received lamp was determined to be 2.5 eV. Discharge operation of the lamp reduced the work function by activating the oxide-coated materials. The lowest observed work function ranged from 2.2 to 2.3 eV.

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© 2008 The Illuminating Engineering Institute of Japan
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