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We prepare two layers organic light-emitting diodes (OLED) composed of small molecular materials. Organic multilayers are accumulated by spin-coat method on polyethylene terephthalate/indium-tin oxide (PET/ITO) substrate. The multilayer is investigated by measurement of current density as a function of applied voltage at three different positions. Among these points, at the one farthest from the rotating center in the spin-coat process, the largest current density of 1.1 mA/cm is observed under a bias voltage of 20 V. For this point linear relationship in lnJ versus V and lnJ/V versus V indicate that the electronic conduction originates from Schottky and a hopping mechanism of carriers. At the other positions, where film thickness is thinner, tunneling current is expected.

Preparation of Two Layers Organic Thin Films on an ITO/PET Substrate using Alq<sub>3</sub>/ coumarin6 and PEDOT/PSS by Spin Coat