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本文讨论了ZnO:Zn低能电子发光亮度饱和的物理原因。指出,在V_g=V_a(通常数字显示的情况)的条件下,亮度饱和的主要原因是ZnO:Zn次级电子发射和阴极发射疲劳;若取V_g(?)V_a,则饱和亮度成倍提高,这时热猝灭将是亮度饱和的主要因素。同时指出,对于一定的输入功率,存在着一个与最佳效率相对应的最佳阳极电流密度;低阳极电流密度,高阳极电压往往是低效率的。作者根据本文的研究结果,制成了饱和亮度高达37,000 cd/m~2的发光管和饱和亮度为22,000 cd/m~2、能在5,000至10,000 cd/m~2稳定工作的高亮度数字显示管。后者配上适当的滤光片、在阳光直接照射或照度高达100,000lux的条件下仍能清晰地阅读。
This paper discusses the physical reason why the brightness of ZnO: Zn low-energy electrons is saturated. It is pointed out that under the condition of V_g = V_a (usually the case of digital display), the brightness saturation is mainly due to ZnO: Zn secondary electron emission and cathode emission fatigue; if V_g (?) V_a is taken, the saturation brightness is doubled, Thermal quenching will be a major factor in brightness saturation at this time. Also pointed out that for a certain input power, there is an optimum current corresponding to the best anode current density; low anode current density, high anode voltage is often inefficient. Based on the results of this study, the authors made a luminescent tube with a saturation brightness of 37,000 cd / m ~ 2 and a high-brightness digital display with a saturation brightness of 22,000 cd / m ~ 2 and stable operation at 5,000 to 10,000 cd / m ~ tube. The latter with the appropriate filter, the direct sunlight or illumination up to 100,000 lux conditions can still clearly read.