Rare earth hexagonal cold cathode field emission type electron source polyboride

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A cold-cathode field-emission electron source to which a rare-earth hexaboride has been applied and which is prevented from being damaged or deteriorated by chemical reactions, has excellent durability, and can be used for long. The cold-cathode field-emission electron source emits electrons by means of a high electric field, and is characterized in that a single-crystal nanofiber of a rare-earth hexaboride has been attached to the surface of an electron-source support needle. The cold-cathode field-emission electron source is further characterized in that the electron-source support needle is constituted of a material which undergoes no chemical reaction at the connecting section between the electron-source support needle and the single-crystal nanofiber of a rare-earth hexaboride even when the cold-cathode field-emission electron source heats up to a high temperature.