| abstract |
An OLED device comprises a cathode, (113) a light emitting layer (109) and an anode, (101) in that order, and (i) a first layer, (111) located between the cathode and the light emitting layer, containing (a) more than 50 vol% of an organic salt or complex of an alkali or alkaline earth metal and (b) a carbocyclic fused ring aromatic compound, that is less than 15 nm thick; and (ii) a second layer, (112) located between the first layer and the cathode, containing a codeposited phenanthroline derivative, metal oxinoid complex, and alkali or alkaline earth metal. The device provides excellent short-term operational stability. |