Red-emitting superlinear phosphor
AssigneeInternational Business Machines Corporation
InventorsHiroko Ohtani, Kazuharu Toyokawa
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Abstract
In a red-emitting phosphor which includes ZnSe as a host material, copper (Cu) as an activator and aluminum (Al) as a coactivator, the improvement comprising the inclusion of a small amount of cobalt (Co) to provide superlinear characteristics to said phosphor in combination with said Cu and Al. A preferred range of concentration of said Co is 10.sup.-6 -2.times.10.sup.-5 g atom/mol. A specific application of said red-emitting superlinear phosphor is as a phosphor screen for a current density sensitive, single gun color CRT, when mixed with a green-emitting sublinear phosphor.
Claims8
A red-emitting phosphor which includes ZnSe as a host material, Cu as an activator and Al as a coactivator, and Co in amount sufficient to impart superlinear characteristics to said phosphor.
A phosphor screen for a current-sensitive, single-gun color CRT, comprising the mixture of a red-emitting superlinear phosphor ZnSe having Cu, and Al as activator and coativator respectively and a small concentration of, Co sufficient to render said phosphor superlinear and a green-emitting sublinear phosphor selected from Zn.sub.2 SiO.sub.4 :
- Mn and (Zn, Cd)S:
- Ag.
Dependencies are inferred from the claim text.