Patent ID: 8872164
Filing Date: 2014-10-28
Classification: H01L

Abstract:
1. An organic light-emitting element, comprising: an anode; a functional layer containing an organic material; and a hole injection layer for injecting holes to the functional layer, the hole injection layer being between the anode and the functional layer, wherein the hole injection layer comprises tungsten oxide, the hole injection layer is formed under conditions where a total gas pressure is higher than 2.7 pascals and at most equal to 7.0 pascals, a ratio of oxygen partial pressure to the total gas pressure is at least equal to 50% and at most equal to 70%, and an input power density of a sputtering target is at least equal to 1 W/cm an ultraviolet photoelectron spectroscopy spectrum of the hole injection layer, using a He I line as a light source and a normal line direction of a surface of the substrate as an electron emission angle, exhibits an upward protrusion that is 1.8 electron volts to 3.6 electron volts lower than a lowest energy level of a valence band of the hole injection layer in terms of binding energy, the upward protrusion corresponding to an occupied energy level of the hole injection layer.