This study addresses the feasibility of using an organic oxide/Al composite cathode to fabricate the small molecular organic light-emitting diodes (OLEDs). A supplementary organic buffer film is placed at the interface between the tris(8-hydroxyquinoline) aluminum (Alq3) and the organic oxide/Al complex layers. Incorporating the rubrene/poly(ethylene glycol) dimethyl ether (PEGDE) buffer layers into the composite cathode structure markedly improves the performance of devices. The luminous efficiencies of Alq3-based OLEDs biased at 100mAcm2 are 4.8 and 5.1cdA for rubrene (50Å)/PEGDE (15Å)Al and rubrene (50Å)/PEGDE (15Å)LiF(5Å)Al cathode devices, and 1.3 and 3.8cdA for devices with Al and LiF (5Å)Al cathodes, respectively.

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