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报道了六硼化镧(LaB6)场发射尖锥的场发射性能.采用电化学腐蚀方法制作了LaB6场发射尖锥,并在10-2～10-7 Pa 的宽真空度范围内对单尖LaB6场发射二极管的发射特性进行了测试.发现残余气体电离产生的离子轰击对LaB6场发射阴极尖锥表面起到了离子清洗作用,使LaB6场发射尖锥在低真空工作后发射电流大幅度提高.离子轰击是一种适用于LaB6场发射阴极的激活处理方法.“,”This paper describes the field emission characteristics of electrochemically fabricated lanthanum hexaboride (LaB6) single tip emitters.It is found that high pressure operation will significantly enlarge the effective emission area and emission current density.This phenomenon is contributed to the bombardment of ions generated by residual gas molecules interacting with emitted electrons.High pressure operation is probably a method to activate LaB6 field emitters.