OPTICAL STRUCTURES THAT PROVIDE DIRECTIONALLY ENHANCED LUMINANCE

摘要

An optical structure (100) is described. The optical structure (100) includes a light source (110) emitting light in a first wavelength range. The optical structure also includes a light redirecting element (120) arranged to receive light from the light source (110) and provide redirected light redirected in a preferred direction or orientation. The light redirecting element (120) comprises a material which absorbs light in a second wavelength range within the first wavelength range such that the redirected light is in a third wavelength range .