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The electroluminescence (EL) of bilayer devices (ITO/Polymer/Alq3/Al) made from two PPV derivatives (MN-PPV and MEH-PPV),respectively,and the influence of the organic layers' thickness on the characteristics of the device are investigated. Different spectra and variations are observed for different thicknesses of Alq3 layer in this bilayer organic light-emitting diodes (LEDs) as increasing applied bias. Based on the energy level and field-assisted tunneling at the interface,we attributed these phenomena to electric field redistribution in the device and field-assisted charges being transported and tunneling through energy barrier at high electric field.