Abstract: An organic electroluminescence device has at least one anode disposed on a substrate, at least one hole injection structure including at least one first material layer and at least one second material layer disposed on the anode, at least one organic luminescence layer disposed on the hole injection structure, and an electron source layer disposed on the organic luminescence layer. The first material layer includes a mixture of at least one first conductive material and at least one organic material, and the second material layer includes at least one second conductive material.

Abstract: An organic light-emitting device (OLED). The device comprises a metal anode, a composite cathode and a multi-layer organic material interposed therebetween. The multi-layer organic material comprises a fluorocarbon layer contacting the metal anode. The composite cathode comprises a low work function metal layer, a low activity metal layer overlying the low work function metal layer and a cap layer overlying the low activity metal layer.

Abstract: An organic electro-luminescent device including a substrate, a plurality of organic electro-luminescent units and a reflective electrode layer is provided. The organic electro-luminescent units are stacked on the substrate, and the reflective electrode layer is disposed between the adjacent organic electro-luminescent units. As mentioned above, the organic electro-luminescent device can provide double-sided display function.

Abstract: An organic electro-luminescent device including a substrate, a plurality of organic electro-luminescent units and at least one tungsten oxide layer is provided. The organic electro-luminescent units are stacked on the substrate, and each tungsten oxide layer is disposed between the adjacent organic electro-luminescent units. The organic electro-luminescent device having the at least one tungsten oxide layer therein has good luminance efficiency. Moreover, another organic electro-luminescent device is also provided in the present invention.

Abstract: An organic electro-luminescent device including an anode, a cathode, a light-emitting layer and a hole-transport layer is provided. The light-emitting layer is disposed between the anode and the cathode. The hole-transport layer is disposed between the light-emitting layer and the anode. The hole-transport layer has a formula as follows: wherein R is an alkyl group having 1˜3 carbon atoms.