Visual display system utilizing high luminosity single crystal g

Details Visual display system utilizing high luminosity single crystal g Visual display system utilizing high luminosity single crystal g

1983-10-17

1985-10-29

Hoffman, James R.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2504861, G01J 158

Patent

active

045502560

ABSTRACT:
The disclosed display apparatus comprises a novel high intensity broadband-emitting phosphor. The phosphor is single crystal material in which Tb acts as sensitizer of Ce, the activator. The composition of the phosphor is (Y.sub.3-x-y-z Ce.sub.x Tb.sub.y RE.sub.z) Al.sub.5-w X.sub.w O.sub.12, where RE is one or more 4f-type rare earths other than Y, Ce, and Tb, X is Sc, Ga, or In, and 0<x.ltoreq.0.06, 0<y.ltoreq.0.5, 0.ltoreq.z.ltoreq.2, 0.ltoreq.w.ltoreq.3. In preferred embodiments z and w are either zero, or RE is Lu and X is Ga. The phosphor is typically grown epitaxially by LPE on a Y.sub.3 Al.sub.5 O.sub.12 substrate, and has application in a variety of apparatus, including aircraft cockpit head-up displays and flight simulators.

REFERENCES:
Chemical Abstracts, vol. 81 (1974), p. 421.
Appl. Phys. Lett. 37(5), Sep. 1, 1980, "Epitaxially Grown Monocrystalline Garnet Cathode Ray Tube Phosphor Screens", by J. M. Robertson et al., pp. 471-472.
Appl. Phys. Lett. 38(9), May 1, 1981, "Saturation Effects of Cathodoluminescence in Rare-Earth Activated Epitaxial Y.sub.3 Al.sub.5 O.sub.12 Layer", by W. F. van der Weg et al., pp. 705-707.
The Measurement of Appearance, by Richard S. Hunter, John Wiley & Son, New York, 1975, pp. 80-97.
Journal of Crystal Growth 17 (1972), "The Growth of Magnetic Garnets by Liquid Phase Epitaxy", by S. L. Blank et al., pp. 302-311.
IEEE Transactions on Magnetics, vol. MAG-12, No. 4, Jul. 1976, "Bubble Domain Memory Materials", by J. W. Nielsen, pp. 327-345.
Philips Journal of Research, vol. 35, No. 6, 1980, "Thin Single Crystalline Phosphor Layers Grown by Liquid Phase Epitaxy", by J. M. Robertson et al., pp. 354-371.
The Journal of Chemical Physics, vol. 47, No. 12, Dec. 15, 1967 "Investigation of Some Ce.sup.3+ -Activated Phosphors" by G. Blasse and A. Bril, pp. 5139-5145.
Philips Res. Repts. 22, 1967, "Investigations of Tb.sup.3+ -Activated Phosphors" by G. Blasse et al., pp. 481-504.

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