Efficient single layer electroluminescent device

摘要

An electroluminescent device is composed of a body of small molecule organic material(s) sandwiched between a first and a second electrode, wherein a layer of first insulative material is placed between the body of small molecule organic material(s) and the first electrode, and an optional layer of second insulative material is placed between the body of small molecule organic material(s) and the second electrode. The layer of first insulative material has a thickness which allows first carriers from the first electrode to tunnel therethrough and the second insulative material has a thickness which allows second carriers from the second electrode to tunnel therethrough. Further, the layer of first insulative material provides a barrier to the second carriers and the layer of second insulative material provides a barrier to the first carriers.