Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1991-07-10
1993-06-15
Yusko, Donald J.
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313486, 313489, 313503, 313509, 428690, 428404, B32B 3300, C09K 1170, H01J 6144
Patent
active
052202437
ABSTRACT:
A coated electroluminescent phosphor and an electroluminescent device using the phosphor. The phosphor is coated with a hydrolyzed alkylaluminum coating which renders the phosphors insensitive to atmospheric moisture. The coating process involves vaporizing an aluminum-containing precursor such as trimethylaIuminum or triethylaluminum in an inert gas stream and passing this through a fluidized bed containing the phosphor particles. Water vapor is also passed through the fluidized bed and the water and aluminum precursor react on the surface of the phosphor particles to form hydrolyzed trimethylaluminum or other alkylaluminum. The electroluminescent device includes a first transparent electrode and a second electrode; an electroluminescent phosphor layer disposed between the first electrode and the second electrode; and a transparent substrate supporting the first electrode. The first electrode is disposed between the transparent substrate and the phosphor layer. The phosphor layer includes a phosphor having a coating of hydrolyzed alkylaluminum.
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Gary Richard A.
Klinedinst Keith A.
Lichtensteiger Silvia E.
Craig Frances P.
GTE Products Corporation
Patel Ashok
Ruoff Carl F.
Yusko Donald J.
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