Patent ID: 8993126
Filing Date: 2015-03-31
Classification: H01L,Y10S

Abstract:
1. A light-emitting device comprising: a first light-emitting element and a second light-emitting element adjacent to the first light-emitting element, the first light-emitting element comprising: n EL layers between an anode and a cathode, wherein n is a natural number greater than or equal to 2; and a first layer and a second layer between an m-th EL layer and a (m+1)-th EL layer from the anode, wherein m is a natural number greater than or equal to 1 and less than or equal to n−1, wherein the first layer is provided between and in contact with the (m+1)-th EL layer and the second layer, wherein the second layer is provided between and in contact with the first layer and the m-th EL layer, wherein the m-th EL layer comprises a light-emitting layer and an electron transport layer in contact with the second layer, wherein the first layer comprises a substance having a hole transport property and an acceptor substance with respect to the substance having the hole transport property, wherein the second layer comprises a phthalocyanine-based material, wherein the electron transport layer comprises a substance having an electron transport property and an alkaline earth metal, wherein in the electron transport layer, a concentration gradient of the alkaline earth metal is such that a concentration of the alkaline earth metal becomes lower from an interface with the second layer to the anode, and wherein a distance between a first light-emitting region in the first light-emitting element and a second light-emitting region in the second light-emitting element is longer than or equal to 3 μm and shorter than or equal to 5 μm.