【摘要】 采用电镀方法和直接刷涂的方法在钨针衬底和硅衬底上沉积高压合成的金刚石粉末形成冷阴极。将这种冷阴极与荧光阳极组成真空二极管结构。通过该结构电流 电压特性的测量和发光特性的观察研究了金刚石粉末冷阴极的电子场发射性能。实验显示 ,这些冷阴极都具有很高的电子发射能力 ,最低开启场强达到3 2 5V/μm。用热电正反馈和电导调制效应解释了电子场发射点呈随机分布的现象更多还原

【Abstract】 Electroplating and direct brushing technique were used to deposit commercial HTHP diamond powder on W needles and Si substrates to form cold cathodes.These cold cathodes combined with phosphor anodes constructed testing vacuum diodes.By measuring current voltage characteristics and observing light emission of these diodes,electron emission feature of these diamond powder cold cathodes were investigated.Experiments show that,these cold cathodes have good electron emission ability,the minimum threshold field is 3 25V/μm.Thermal electric positive feed back and conductivity modulation effects were proposed to interpret the phenomenon of random distribution of electron emission sites.更多还原