This invention provides organic electroluminescent devices in which a diffraction grating is formed as a constituent element thereof on the reflecting surface of the cathode or on the light output side, resulting in an improvement in light output efficiency....http://www.google.fr/patents/US6476550?utm_source=gb-gplus-shareBrevet US6476550 - Organic Electroluminescent device with a defraction grading and luminescent layer
Organic Electroluminescent device with a defraction grading and luminescent ...
