PHOTOELECTRON EMISSION SURFACE AND ELECTRONIC TUBE USING THE PHOTOELECTRON EMISSION SURFACE

PROBLEM TO BE SOLVED: To provide a higher sensitive photoelectric emission surface having an active layer dissolving crystal defects and an electronic tube having the photoelectric emission surface. SOLUTION: On the photoelectron emission surface, an epitaxial layer formed by laminating a window layer 31 consisting of (Aly Ga1-y )x 'In1-x P and an active layer 32 consisting of Gax In1-x P in that order is closely provided through an antireflection film 20 on a glass face plate 10. A very thin surface layer 33 consisting of Cs2 O and an electrode 40 consisting of Cr and formed on the upper surface of the active layer 32 at the central part and the peripheral edge part. Crystal defects are dissolved in the active layer 32 in a range of an atomic composition ratio x of 0