| abstract |
(57) Abstract: A lighting system (1) has a substrate (2) and an active layer (3) comprising an electroluminescent material, the active layer (3) comprising a first transparent electrode layer (5) and It is between the second electrode layers (7). The illumination system (1) comprises a light scattering layer (28) comprising a material having light scattering properties and a light scattering layer (2 ', 8, 8', 28, 28 ') comprising a medium having light scattering properties. It is provided in the forward direction (29) with respect to the active layer (3), and the non-scattering variation of the (collimated) light beam when passing through the light scattering layer (8) in the forward direction (29) is 0. It is characterized by being in the range of 05 to 0.8, preferably in the range of 0.1 to 0.5. The light scattering properties of the medium are preferably made stronger as the light is incident more obliquely, as is achieved by using birefringent particles and / or the medium. A very suitable light scattering layer (28) is a (half) monolayer of TiO 2 (spherical) particles having an average size of 0.1-1 μm provided on said substrate (2). The light output of the illumination system (1) is further improved by providing a reflective coating (26) on the edge of the substrate (2). |