An optical device deploring a phosphor layer having a textured surface to improve output of visual light is disclosed. A light emitting device includes a solid state light emitter and a phosphor layer. The solid state light emitter, for example, is configured to convert electrical energy to optical light....http://www.google.com/patents/US7825427?utm_source=gb-gplus-sharePatent US7825427 - Method and apparatus for generating phosphor film with textured surface
