References(18) Emissive oxides are employed as a thermionic emission material on electrodes in fluorescent lamps. In the previous paper introducing a new method for measuring the work function of fluorescent lamp electrodes with emissive oxides, the temperature dependency of work function was dealt with. Further discussion to clarify the relationship between the temperature dependence of work function and the effective value of the Richardson constant was performed in another previous paper. Together with being translated them into English, this paper newly performed other discussions of verifying the slope of the linear line in the relationship with reference to the historical data for tungsten metal and of reconfirming the necessity of applying photoelectronic procedure besides thermionic one in order to measure thermionic emission factors other than work function and the Richardson constant. In particular, the approach to measure donor density is helpful to understand the importance of introducing both photoelectronic and thermionic procedures.
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