Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1996-04-19
1998-07-14
O'Shea, Sandra L.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313503, H05B 3314
Patent
active
057809666
ABSTRACT:
Disclosed is 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.sub.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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Hattori Tadashi
Ito Nobuei
Katayama Masayuki
Kato Akira
Nippondenso Co. Ltd.
O'Shea Sandra L.
Williams Joseph
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