Organic el devices

摘要

Organic EL devices having a light-emitting layer comprising a fluorescent dopant, a light-emitting layer comprising a phosphorescent dopant, and a non-light-emitting interface layer provided between an anode and a cathode wherein the light-emitting layer comprising a fluorescent dopant is provided nearer to the cathode than the light-emitting layer comprising a phosphorescent dopant and wherein the non-light-emitting interface layer is provided between the light-emitting layer comprising a fluorescent dopant and the light-emitting layer comprising a phosphorescent dopant.