Multi-layer faceted luminescent screens
First Claim
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1. A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has:
- (a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and
(b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and
(c) said sublayer comprising Gd3 Ga5 O12 ;
M and said overlayer comprising Gd3 Ga5-b (Sc, In)b O12 where b is in the range between 0 and about 2 and where M is at least one luminescent ion.
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Abstract
A multi-layer luminescent screen includes a luminescent crystalline sublayer and a faceted overlayer. The faceted overlayer causes the emission from the screen of a greater fraction of the luminescence than would otherwise be the case. The screens, which are typically cathodoluminescent, find application in computer displays, lithography, and flying spot scanners.
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Citations
20 Claims
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1. A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has:
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(a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd3 Ga5 O12 ;
M and said overlayer comprising Gd3 Ga5-b (Sc, In)b O12 where b is in the range between 0 and about 2 and where M is at least one luminescent ion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has:
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(a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd3 Ga5 O12 ;
M and the overlayer comprising Gd3 G5-b (Sc,In)b O12 ;
M" in which M and M" are each at least one luminescent ion, and b is in the range between 0 and about 2. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification