Patent ID: 9356250
Filing Date: 2016-05-31
CPC Classification: H01L

Claim Text:
1. A light-emitting element comprising: an anode; a first light-emitting layer over the anode; a second light-emitting layer over the first light-emitting layer; and a cathode over the second light-emitting layer, wherein each of the first light-emitting layer and the second light-emitting layer comprises a host material, a hole-transporting material, and a light-emitting material, wherein a mass ratio of the hole-transporting material to the host material in the first light-emitting layer is greater than or equal to 0.25 and less than or equal to 0.5, and wherein a mass ratio of the hole-transporting material to the host material in the second light-emitting layer is equal to 0.1.