Organic light-emitting devices with multiple hole injection layers containing fullerene

摘要

The present invention provides layered hole injection structures including one or more layers of fullerenes for application in an organic electroluminescent device. The layered structures include a bi-layered structure including an electrically conductive layer serving as electrical contact to external circuit and a fullerene layer sandwiched between the conductive layer and a hole transport layer. The layered structure may also includes a tri-layered structure stacked sequentially including a first electrically conductive layer, a fullerene layer and a hole injection layer material selected from thermally stable molecules such as CuPc. The layered structure may also include a four-layered structure stacked sequentially including a first electrically conductive layer, a fullerene layer on the conductive layer, a noble metal layer on the fullerene layer and another fullerene layer on the noble metal layer.