Thin-film electroluminescent phosphor
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United States of America Patent
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Issued Date -
Apr 18, 2002
app pub date -
Mar 15, 2001
filing date -
Mar 16, 2000
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A light emitting phosphor material for an alternating current thin-film electroluminescent (ACTFEL) device and/or an ACTFEL device includes the phosphor material sandwiched between a pair of dielectric layers suitable to substantially prevent DC current from flowing therebetween. The phosphor material is comprised of, in one aspect of the present invention, the formula M.sup.IIS:Eu,Cu, wherein M.sup.II is strontium, S is sulphur, Eu is europium, Cu is copper. In another aspect of the present invention, the phosphor material is comprised of the formula M.sup.IIS:Eu,Cu, wherein M.sup.II is calcium, S is sulphur, Eu is europium, Cu is copper. In yet another aspect of the present invention, the phosphor material is comprised of the formula M.sup.IIS:Eu,Cu, wherein M.sup.II is strontium and calcium, S is sulphur, Eu is europium, Cu is copper. In a further aspect of the present invention, the phosphor material is comprised of the formula M.sup.IIS:Mn,Cu, wherein M.sup.II is strontium, S is sulphur, Mn is manganese, Cu is copper. In a further aspect of the present invention, the phosphor material is comprised of the formula M.sup.IIS:Mn,Cu, wherein M.sup.II is calcium, S is sulphur, Mn is manganese, Cu is copper.
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