Oxide phosphor electroluminescent laminate
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United States of America Patent
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Jun 11, 2002
Grant Date -
N/A
app pub date -
Feb 23, 2000
filing date -
Feb 23, 1999
priority date (Note) -
Expired
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Abstract
Electroluminescent laminates having a thin film electroluminescent oxide phosphor layer on insulating substrates. Thin film EL laminates are produced using high dielectric constant layers, such as SrTiO.sub.3 and BaTiO.sub.3 next to the oxide phosphor layer on one or both sides of the oxide layer, primarily as stable charge injection, and trapping interface layers, and to increase the electric field in the phosphor. Electric breakdown protection through self-healing has been provided by traditional low K dielectrics in combination with an appropriate choice of adjacent electrode. The high dielectric constant materials employed also provide for a high capacitance layer, thereby increasing the electric field in the phosphor and increasing the charge transfer into the phosphor during emission. These thin film EL laminates demonstrate steep brightness-voltage behavior and have been prepared using green and red electroluminescent oxide phosphors.
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