According to the invention, an insulating or semi-insulating barrier layer
which has a thickness where a tunnel current can flow through is provided
between a hole injection electrode and an organic compound layer with
hole transport characteristics (a hole injection layer or a hole
transport layer). Specifically, a thin insulating or semi-insulating
barrier layer which contains silicon or silicon oxide; silicon or silicon
oxide and a light transmitting conductive oxide material; or silicon or
silicon oxide, a light transmitting conductive oxide material, and carbon
may be provided between a light transmitting conductive oxide film formed
of a light transmitting conductive oxide material, such as ITO and a hole
injection layer containing an organic compound.