Figure 4
From: An electrophosphorescent organic light emitting concentrator
(a) Normalized luminous intensity (L(ϕ)). Also shown is an illustration of the directions along which the intensity profiles of the devices were measured. (b) Calculated illuminance I(ϕ) of the concentrator with respect to the reference in polar coordinates vs. the viewing angle ϕ, as measured in the direction parallel to the side (denoted as horizontal) and along the diagonal of the aperture. The shaded area indicates the zone of nearly uniform illumination achieved by the concentrator along the horizontal axis.
