Organic electroluminescent device

摘要

The present invention provides an organic electroluminescent device including a pair of electrodes including an anode and a cathode, at least one of which is transparent or translucent; and one or more organic compound layers placed between the pair of electrodes, wherein at least one of the organic compound layers contains a charge transport material that satisfies the following relations: (ta-tT)/ta<0.5 Expression (1) D/mu<20 Expression (2) wherein, in an electric field of 10 V/mum, tT is a transit time of a transient photocurrent waveform; IT is a current value at time tT; Ia is half of the current value IT; ta is a time at the current value Ia on the transient photocurrent waveform; D and mu are respectively a diffusion coefficient and a true mobility obtained from the transient photocurrent waveform; and D/mu is the ratio of D to mu.