Photocathode

Details Photocathode Photocathode

1986-06-10

1988-02-16

DeMeo, Palmer C.

Electric lamp and discharge devices

Photosensitive

Photocathode

H01J 4006

Patent

active

047257580

ABSTRACT:
A photocathode including a first silver layer formed on a transparent substrate by vacuum deposition, a silver oxide layer formed in such a manner that oxygen gas is introduced and electric discharge is caused in the oxygen gas thus introduced to oxide the surface of the first silver layer, a potassium layer formed on the silver oxide layer in such a manner that the substrate and the first silver layer are heated and potassium is vacuum-deposited on the silver oxide layer, a sodium layer formed on the potassium layer by vacuum-depositing sodium with the potassium layer heated, a second silver layer formed on the sodium layer by vacuum-depositing silver, a cesium layer formed on the second silver layer by vacuum-depositing cesium, and a third silver layer formed on the cesium layer by vacuum-depositing silver.

REFERENCES:
patent: 2242395 (1941-05-01), Hartmann et al.
patent: 3006786 (1961-10-01), Sjoberg
patent: 4196257 (1980-04-01), Engstrom et al.
Sommer, A.; "Photo-Emissive Materials," (John Wiley Sons Inc., 1968) pp. vii-ix, 133-140.

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