An electroconductive device functioning as, e.g., an organic EL device, is formed of a pair of oppositely disposed electrodes and organic compound layers disposed between the electrodes so as to be supplied with a voltage applied between the electrodes. The organic compound layers include at least one layer of a liquid crystalline organic compound in a supercooled liquid crystal phase As a result, the electroconductive device can exhibit an improved performance over a broad temperature range due to the presence of the organic compound layer in a liquid crystal phase.