| abstract |
An organic light emitting diode (OLED) device having a cathode, a light emitting layer and an anode, in that order, and having located between the cathode and the light emitting layer,n (a) a first electron transport layer comprising (i) more than 50 vol % of a salt or complex of an alkali or alkaline earth metal and (ii) a carbocyclic fused ring aromatic compound; and (b) a second electron transport layer, different from the first electron transport layer, in contact with the first electron transport layer on the cathode side and comprising a compound with a 7,10-diaryl substituted fluoranthene nucleus having no aromatic rings annulated to the fluoranthene nucleus. The device provides reduced drive voltage and good luminance with improved T 90 lifetime. |