Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1988-06-13
1989-03-28
Wieder, Kenneth
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313503, H05B 3314, H05B 3320
Patent
active
048167177
ABSTRACT:
The invention provides electroluminescent lamps that contain light-emitting phosphors and covering layers which have unusual durability, light transmissivity and resistance to moisture using simple screen printing and doctor blade coating techniques. It is discovered that a liquid dispersion of thermoplastic polymer powder particles, e.g. predominantly of polyvinylidene fluoride, simultaneously: (a) can suspend electrical property additives, such as crystalline, hard, dense particles of generally spherical shape, uniformly in desired concentrations (b) while containing a useful concentration of any of a wide range of such particles, can be deposited by high shear transfer to a substrate in accurately controllable thickness and contour; (c) when so deposited can be fused into a continuous uniform film which has low absorptivity, e.g. of moisture and acts as a barrier film; (d) can, as one layer, be fused with other such layers, containing other electrical property additives, to form a monolithic electrical component; and, (e) in general, can meet all requirements for the making of electroluminescent lamps.
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Harper William P.
Lunt Michael S.
Rogers Corporation
Wieder Kenneth
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