편의상 애노드와 접촉하는 층은 홀 주입층이라고 칭해지고, 홀 주입층과 접촉하는 층은 홀 전송층이라고 칭해진다.
For convenience, the layer in contact with the anode is referred to as a hole injection layer, and the layer in contact with the hole injection layer is referred to as a hole transport layer.