Patent ID: 7564052
Filing Date: 2009-07-21
Classification: H01L,Y10S

Abstract:
1. A light-emitting element comprising: a first layer; a second layer; and a third layer, wherein the first, second and third layers are interposed between first and second electrodes which faces to each other; wherein the first layer includes TPAQn and a first substance showing an electron accepting property to the TPAQn; wherein the second layer includes a second substance having an electron transporting property higher than a hole transporting property, and a third substance showing an electron donating property to the second substance; wherein the third layer contains a light-emitting substance; wherein the first, second and third layers are sequentially stacked; wherein the first layer is in contact with the first electrode; wherein the third layer is in contact with the second electrode; and wherein light is emitted when a voltage is applied such that a potential of the second electrode is higher than that of the first electrode.