Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1995-04-19
1997-01-28
Horabik, Michael
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313503, 313506, H01J 162, H01J 6304
Patent
active
055980597
ABSTRACT:
An AC thin film electroluminescent (TFEL) device includes a multilayer phosphor for emitting white light having improved emission intensity in the blue region of the spectrum. The multilayer stack consists of an inverted structure thin film stack having a red light emitting manganese doped zinc sulfide (ZnS:Mn) layer disposed on a first insulating layer; a blue-green light emitting cerium doped strontium sulfide (SrS:Ce) layer disposed on the red light emitting layer; and a blue light emitting cerium activated thiogallate phosphor (Sr.sub.x Ca.sub.1-x Ga.sub.2 S.sub.4 :Ce) layer disposed on the blue-green light emitting layer. The manganese doped zinc sulfide layer acts as a nucleating layer that lowers the threshold voltage, and the cerium activated thiogallate phosphor layer provides a moisture barrier for the hydroscopic cerium doped strontium sulfide layer. The white light from the multilayer phosphor can be appropriately filtered to produce any desired color.
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Nire, et al., "Multi-Color TFEL Display Panel with Double-Hetero-Interface Structured Active Layer," (four pages printed material, no page numbers or other identification).
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Sun Sey-Shing
Tuenge Richard T.
Day Michael
Horabik Michael
Planar Systems Inc.
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