Patent ID: 8779453
Filing Date: 2014-07-15
Classification: H01L,H05B

Abstract:
1. A light-emitting element, comprising: a reflective electrode that reflects incident light; a transparent electrode that faces the reflective electrode and transmits an incident light therethrough; a light-emitting layer, disposed between the reflective electrode and the transparent electrode, that emits a blue light; a functional layer disposed between the reflective electrode and the light-emitting layer; and a color filter disposed above the light-emitting layer, with the transparent electrode being interposed therebetween, wherein a first portion of the blue light emitted from the light-emitting layer travels along a first optical path that passes through the functional layer, strikes the reflecting electrode and is reflected by the reflective electrode, and is then emitted externally after passing through the functional layer, the light-emitting layer, the transparent electrode, and the color filter, a second portion of the blue light emitted from the light-emitting layer travels along a second optical path towards the transparent electrode, instead of towards the reflective electrode, and is emitted externally after passing through the transparent electrode and the color filter, an optical film thickness of the functional layer is not close to an optical film thickness at which maximum light-extraction efficiency occurs when the color filter is not provided, and is close to an optical film thickness at which maximum light-extraction efficiency occurs when the color filter is provided, and the optical film thickness of the functional layer is from approximately 218 nm to approximately 238 nm.