Electroluminescent illumination system with an active layer of a

Details Electroluminescent illumination system with an active layer of a Electroluminescent illumination system with an active layer of a

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).

REFERENCES:
patent: 3074816 (1963-01-01), Blazek
patent: 3178580 (1965-04-01), Vogel
patent: 3200279 (1965-08-01), Westerveld et al.
patent: 4099091 (1978-07-01), Yamazoe et al.
patent: 4734618 (1988-03-01), Matsudaira et al.
patent: 5504389 (1996-04-01), Dickey
patent: 5700591 (1997-12-01), Okajima et al.
"LEDs" by R. Friend, D. Bradley and A. Holmes in Physics World, Nov. 1992, pp. 42-46.

Affiliated with

Also associated with

Rating

Electroluminescent illumination system with an active layer of a does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electroluminescent illumination system with an active layer of a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electroluminescent illumination system with an active layer of a will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-83234