Top-emitting organic light-emitting devices (TOLEDs) with high efficiency and low driving voltage using silver-silver microcavity structure were demonstrated. With tris(8-hydroquinoline) aluminum as emission layer, the Ag-Ag based TOLED showed a maximum luminous efficiency of 9.21 cd/A which was much higher than conventional Ag-Al/Ag based TOLED (4.21 cd/A) and corresponding bottom-emitting OLED (3.77 cd/A). The Ag-Ag based TOLED also exhibited low driving voltage and thereby an enhanced power efficiency of 4.25 Im/W (at 40 mA/cm(2)). The excellent performance of Ag-Ag based TOLED was attributed to the significant microcavity effect and efficient carrier injection from Ag electrode. (C) 2009 Elsevier B.V. All rights reserved.