Patent ID: 9293723
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A light-emitting device comprising: a hole-injection layer comprising a first compound over an anode, the hole-injection layer including a halogen element as an impurity; a hole-transport layer comprising a second compound over the hole-injection layer, the hole-transport layer including a halogen element as an impurity; a light-emitting layer comprising a host material and a light-emitting substance over the hole-transport layer, the light-emitting layer including a halogen element as an impurity; an electron-transport layer over the light-emitting layer; an electron-injection layer over the electron-transport layer; and a cathode over the electron-injection layer, wherein a concentration of the halogen element in the hole-injection layer is higher than a concentration of the halogen element in the hole-transport layer, and