Sputtering method of producing and electroluminescent device with improved blue color purity
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United States of America Patent
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Jul 3, 2001
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N/A
app pub date -
Apr 13, 1998
filing date -
Apr 20, 1995
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Abstract
Disclosed is a method of producing an electroluminescent (EL) device having a CaGa.sub.2 S.sub.4 :Ce luminescent layer. The ratio of the X-ray diffraction peak intensity I.sub.2 for the (200) reflection of CaS to the X-ray diffraction peak intensity I.sub.1 for the (400) reflection of CaGa.sub.2 S.sub.4 as appearing in the X-ray diffraction spectrum for the luminescent layer, I.sup.2 /I.sub.1, is 0.1 or less. The amount of the impurity CaS in the luminescent layer is reduced. The EL device produces blue emission with high purity.
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