Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Patent
1997-10-10
1999-09-21
O'Shea, Sandra
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
313509, 313503, 313505, 313489, H01J 162
Patent
active
059558377
ABSTRACT:
The illumination system (1) has a substrate (2) and an active layer (3) comprising an electroluminescent material, in which the active layer (3) is present between a first, optically transparent electrode layer (5) and a second electrode layer (7). The illumination system (1) is characterized in that a light-scattering layer (28) comprising a medium having light-scattering properties is present in a forward direction (29) with respect to the active layer (3), in which the non-scattered fraction of a (collimated) light beam, when passed through the light-scattering layer (8) in the forward direction (29), is in the range between 0.05 and 0.8, preferably in the range between 0.1 and 0.5. The light-scattering properties of the medium are preferably stronger as the light is more obliquely incident, as is achieved by using birefringent particles and/or media. A very suitable light-scattering layer (28) is a (half) monolayer of TiO.sub.2 particles provided on the substrate (2), with an average size of the (spherical) particles of 0.1-1 .mu.m. The light output of the illumination system (1) is further improved by providing the edges of the substrate (2) with a reflective coating (26).
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"LEDs" by R. Friend, D. Bradley and A. Holmes in Physics World, Nov. 1992, pp. 42-46.
Berntsen Adrianus J. M.
Boots Henri M. J.
Horikx Jeroen J. L.
Liedenbaum Coen T. H. F.
van der Mark Martinus B.
Biren Steven R.
DelGizzi Ronald E.
O'shea Sandra
U.S. Philips Corporation
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