https://doi.org/10.1051/epjap/2015140468
Preheated ignition and work function studies on alkaline earth metal oxides coated tungsten electrodes of fluorescent lamps
1
Institut für Physik, Lehrstuhl für Experimentalphysik II, Universität Augsburg, Universitätsstr. 1, 86159
Augsburg, Germany
2
OSRAM AG, Berliner Allee 65, 86136
Augsburg, Germany
a e-mail: reinhard.langer@physik.uni-augsburg.de
Received:
27
November
2014
Revised:
15
January
2015
Accepted:
22
January
2015
Published online:
12
March
2015
This paper describes measurements on the alkaline earth (Ba, Sr, Ca) oxide layers utilized as emitting material in fluorescent lamp electrodes. In a first approach we compared the emission capabilities of the different materials (BaO, SrO and CaO coatings on tungsten filaments) by their ability to facilitate the start of a lamp. In a second investigation the work function was measured quantitatively by means of a Kelvin probe. Basically, the results of both measurements coincide. The impact of sample geometry on measurement results of a Kelvin probe applied for work function measurements of lamp electrodes are discussed in detail.
© EDP Sciences, 2015
