Patent ID: 8653553
Filing Date: 2014-02-18
Classification: B60Q,C09K,F21S,F21Y,H01L,H05B

Abstract:
1. A light-emitting element comprising: a first electrode; a first light-emitting layer over the first electrode comprising: a second light-emitting layer over the first light-emitting layer comprising: a third light-emitting layer over the second light-emitting layer comprising: a second electrode over the third light-emitting layer, wherein the first phosphorescent compound emits blue light, wherein ε(λ)λ wherein the second phosphorescent compound emits light with a wavelength longer than a wavelength of the light emitted from the first phosphorescent compound, wherein ε(λ)λ wherein the third phosphorescent compound emits light with a wavelength longer than the wavelength of the light emitted from the second phosphorescent compound, wherein λ denotes a wavelength, and wherein ε(λ) denotes a molar absorption coefficient at the wavelength λ.