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Measurement of work function of practical fluorescent lamp electrodes with emissive oxides

Journal of the Illuminating Engineering Institute of Japan Volume 89 Issue 5 Page 236-244
published_at 2005-05
2007010069.pdf
[fulltext] 1.96 MB
Title
実用蛍光ランプ電極の仕事関数の測定
Measurement of work function of practical fluorescent lamp electrodes with emissive oxides
Creators Myojo Minoru
Creators Fukumasa Osamu
Creator Keywords
work function fluorescent lamp emissive oxide electron emission electrode Richardson constant
In this paper we propose a method for measuring work function of practical fluorescent lamp electrodes with emissive oxides. The work function measurement is based on the matching between the zero-field thermionic emission currents and various dc lamp currents set in a normal glow discharge by means of a lamp voltage monitoring procedure with an electrode-heating device for thermionic emission measurement. Measuring the work function of practical fluorescent lamp electrodes is a promising approach because changes that occur in the work function of aged-lamp electrodes in some lighting systems will be helpful in evaluating the system. The paper points out the doubtful approach of taking a rather small value of the Richardson constant. To solve this issue, a temperature-dependent work function is introduced. In the first stage of the paper, the Richardson constant is taken as the theoretical value. As a result, work function φ[eV] of a fluorescent lamp electrode halfway through its lamp life was measured and given as : φ=0.80+1.36×10^<-3>T (computed from equation with T^2) where T was the electrode temperature [K]. Second, an attempt is made to measure a temperature-dependent work function taking a realistic value of the Richardson constant. The smaller the value of the Richardson constant, the smaller the estimated work function is. Finally, the paper examines how to take a realistic value of the Richardson constant.
Subjects
電気電子工学 ( Other)
Languages jpn
Resource Type journal article
Publishers 照明学会
Date Issued 2005-05
File Version Version of Record
Access Rights open access
Relations
[ISSN]0019-2341
[NCID]AN00268860
[isPartOf] [URI]http://ci.nii.ac.jp/vol_issue/nels/AN00268860_jp.html
Schools 大学院理工学研究科(工学)