| abstract |
(57) [Problem] To provide a photoelectron emitting material capable of effectively releasing negative ions for a long time, and a negative ion generator using the same. SOLUTION: In a photoelectron emitting material 3 in which a substance which emits photoelectrons by ultraviolet irradiation and a substance which exerts a photocatalytic action by ultraviolet irradiation are arranged on the same surface, (1) first, photoelectrons are emitted onto a Ti base material. After the addition of the substance, the substrate Ti is placed in an oxygen-containing atmosphere, Baking at a temperature of ~ 1200 ° C to make a photocatalyst, (2) On the Al or Al alloy substrate, first add a substance that emits photoelectrons, then anodize the substrate Al or Al alloy, and fix TiO 2 as a photocatalyst, A negative ion generator including the photoelectron emitting material 3 and an ultraviolet light source 1 for irradiating the photoelectron emitting material with ultraviolet light. |