Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product
Patent
1982-01-28
1983-07-05
Louie, Jr., Won H.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
430 84, 430 19, 430962, 430 95, 350390, 350356, 252 629, 2525011, 501134, 365109, 365117, 365119, 365145, 365157, G03C 100
Patent
active
043919014
ABSTRACT:
The photosensitivity of lead lanthanum zirconate titanate (PLZT) ceramic material used in high resolution, high contrast, and non-volatile photoferroelectric image storage and display devices is enhanced significantly by positive ion implantation of the PLZT near its surface. Implanted ions include H.sup.+, He.sup.+, Ne.sup.+, Ar.sup.+, as well as chemically reactive ions from Fe, Cr, and Al. The positive ion implantation advantageously serves to shift the absorption characteristics of the PLZT material from near-UV light to visible light. As a result, photosensitivity enhancement is such that the positive ion implanted PLZT plate is sensitive even to sunlight and conventional room lighting, such as fluorescent and incandescent light sources. The method disclosed includes exposing the PLZT plate to the positive ions at sufficient density, from 1.times.10.sup.12 to 1.times.10.sup.17, and with sufficient energy, from 100 to 500 KeV, to provide photosensitivity enhancement. The PLZT material may have a lanthanum content ranging from 5 to 10%, a lead zirconate content of 62 to 70 mole %, and a lead titanate content of 38 to 30%. The ions are implanted at a depth of 0.1 to 2 microns below the surface of the PLZT plate.
REFERENCES:
patent: 3868653 (1975-02-01), Winter
patent: 3978458 (1976-08-01), Vergnolle et al.
patent: 4135224 (1979-01-01), Maher
patent: 4158201 (1979-06-01), Smith et al.
Land et al., "New Image Storage Mechanisms in PLZT Ceramics using Near-UV," IEEE-SID Biennial Display Conference Record, pp. 71-75 (Oct., 1976).
Land Cecil E.
Peercy Paul S.
Louie, Jr. Won H.
The United States of America as represented by the United States
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