| Summary: | 碩士 === 中原大學 === 電子工程研究所 === 102 === Flat Electron Emission Lamp (FEEL) uses gas discharge theory to produce secondary electrons. By electric fields, accelerated electrons impact gas to produce avalanche effect, and then electrons excite anode phosphor to emit light. The key points of FEEL’s luminous efficiency are the number of electrons and the energy of electrons. In the process of ion bombard cathode will damage to thin film and reduce FEEL’s lifetime. Based on gas discharge theory, the species of ion,operation voltage, and cathode materials will affect the factor of secondary electron emission coefficient. This paper will analyze the relation between FEEL and different cathode materials protective layers, and made a series of studies.
In this paper, we use Paschen’s Curve to get secondary electron emission coefficients of different cathode materials protective layers. When the FTO conductive thin film as FEEL cathode, the breakdown voltage of FEEL is 3675 V, the luminous efficiency is 0.88 lm/W, the secondary electron emission coefficient is 0.00081. If the thickness of MgO thin films deposited on FTO by sputtering more than 100 nm, the spark will occur and instantaneously damage cathode surface. When the thickness of MgO is reduced to 30 nm, FEEL elements have the best emission characteristics, its breakdown voltage drop of 2850 V, 17.5 times the luminous efficiency, secondary electron emission coefficient increased to 0.11556. If the thickness of STO thin films deposited on FTO
III
by sputtering is 500 nm, there will not be an instant sparks. When the thickness of STO is reduced to 100 nm, FEEL elements have the best emission characteristics, its breakdown voltage drop of 1450 V, 7.1 times the luminous efficiency, secondary electron emission coefficient increased to 0.0014.
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