Organic electroluminescent device and display medium

A display medium comprising:

• organic electroluminescent devices in at least one of a matrix arrangement or a segment arrangement, each of the organic electroluminescent devices comprising a pair of electrodes including a positive electrode and a negative electrode, at least one of the electrodes being transparent or semi-transparent, and an organic compound layer including one or more layers interposed between the pair of electrodes, at least one layer included in the organic compound layer containing one or more compounds represented by the following formula (I);
• and
• a driving unit that drives the organic electroluminescent devices in at least one of a matrix arrangement or a segment arrangement:
• in formula (I), Rls each independently representing a linear alkyl group having from 3 to 20 carbon atoms, a linear alkoxy group having from 3 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, or a branched alkoxy group having from 3 to 20 carbon atoms;
• and R2s each independently representing a hydrogen atom, a linear alkyl group having from 1 to 20 carbon atoms, a linear alkoxy group having from 1 to 20 carbon atoms, a branched alkyl group having from 3 to 20 carbon atoms, or a branched alkoxy group having from 3 to 20 carbon atoms.