Light-emitting device, display device, electronic device, and lighting device

Abstract

One object of this invention is to provide a novel light-emitting device with low power consumption. The light-emitting device includes a first light-emitting element and a second light-emitting element. The first light-emitting element includes a first electrode, a second electrode, and a light-emitting layer. The second light-emitting element includes the first electrode, a third electrode, and the light-emitting layer. The second electrode comprises only a first conductive film, and the third electrode comprises a second conductive film and a third conductive film. The first electrode has a function of reflecting light. The second conductive film has functions of reflecting light and transmitting light. The first conductive film and the third conductive film each have a function of transmitting light.

What is claimed is: 
     
         1 . A light-emitting device comprising:
 a first light-emitting element comprising a first electrode, a second electrode, and an electroluminescence layer including a light-emitting layer; and   a second light-emitting element comprising the first electrode, a third electrode, and the electroluminescence layer including the light-emitting layer,   wherein the second electrode consists of a first conductive film,   wherein the third electrode comprises a second conductive film, a third conductive film over the second conductive film, and a fourth conductive film over the third conductive film,   wherein each of the second conductive film and the fourth conductive film comprises an oxide including indium, and   wherein the third conductive film comprises silver.   
     
     
         2 . The light-emitting device according to  claim 1 ,
 wherein the oxide including indium further comprises tin.   
     
     
         3 . The light-emitting device according to  claim 1 ,
 wherein the first light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, a yellow wavelength range, and a red wavelength range, and   wherein the second light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, and a red wavelength range.   
     
     
         4 . The light-emitting device according to  claim 1 ,
 wherein the electroluminescence layer comprises a second light-emitting layer.   
     
     
         5 . The light-emitting device according to  claim 1 ,
 wherein the third conductive film comprises a metal with a thickness greater than or equal to 1 nm and less than or equal to 30 nm.   
     
     
         6 . The light-emitting device according to  claim 1 ,
 wherein the first electrode comprises at least one of silver and aluminum.   
     
     
         7 . A light-emitting device comprising:
 a first light-emitting element comprising a first electrode, a second electrode, and an electroluminescence layer including a light-emitting layer; and   a second light-emitting element comprising the first electrode, a third electrode, and the electroluminescence layer including the light-emitting layer,   wherein the second electrode consists of a first conductive film,   wherein the third electrode comprises a second conductive film, a third conductive film over the second conductive film, and a fourth conductive film over the third conductive film,   wherein each of the second conductive film and the fourth conductive film comprises indium tin oxide containing silicon, and   wherein the third conductive film comprises silver.   
     
     
         8 . The light-emitting device according to  claim 7 ,
 wherein the first light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, a yellow wavelength range, and a red wavelength range, and   wherein the second light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, and a red wavelength range.   
     
     
         9 . The light-emitting device according to  claim 7 ,
 wherein the electroluminescence layer comprises a second light-emitting layer.   
     
     
         10 . The light-emitting device according to  claim 7 ,
 wherein the third conductive film comprises a metal with a thickness greater than or equal to 1 nm and less than or equal to 30 nm.   
     
     
         11 . The light-emitting device according to  claim 7 ,
 wherein the first electrode comprises at least one of silver and aluminum.   
     
     
         12 . A light-emitting device comprising:
 a first light-emitting element comprising a first electrode, a second electrode, and an electroluminescence layer including a light-emitting layer;   a second light-emitting element comprising the first electrode, a third electrode, and the electroluminescence layer including the light-emitting layer;   a third light-emitting element comprising the first electrode, a fourth electrode, and the electroluminescence layer including the light-emitting layer; and   a fourth light-emitting element comprising the first electrode, a fifth electrode, and the electroluminescence layer including the light-emitting layer,   wherein the second electrode comprises a first conductive film,   wherein the third electrode comprises a second conductive film, a third conductive film over the second conductive film, and a fourth conductive film over the third conductive film,   wherein the fourth electrode comprises the second conductive film, the third conductive film over the second conductive film, and a fifth conductive film over the third conductive film,   wherein the fifth electrode comprises the second conductive film, the third conductive film over the second conductive film, and a sixth conductive film over the third conductive film,   wherein each of the second conductive film, the fourth conductive film, the fifth conductive film, and the sixth conductive film comprises an oxide including indium,   wherein the third conductive film comprises silver,   wherein the fourth conductive film is thicker than the fifth conductive film, and   wherein the fifth conductive film is thicker than the sixth conductive film.   
     
     
         13 . The light-emitting device according to  claim 12 ,
 wherein the oxide including indium further comprises tin.   
     
     
         14 . The light-emitting device according to  claim 12 ,
 wherein the first light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, a yellow wavelength range, and a red wavelength range, and   wherein the second light-emitting element is configured to emit light having a peak of an emission spectrum in a red wavelength range,   wherein the third light-emitting element is configured to emit light having a peak of an emission spectrum in a green wavelength range, and   wherein the fourth light-emitting element is configured to emit light having a peak of an emission spectrum in a blue wavelength range.   
     
     
         15 . The light-emitting device according to  claim 12 ,
 wherein the electroluminescence layer comprises a second light-emitting layer.   
     
     
         16 . The light-emitting device according to  claim 12 ,
 wherein the third conductive film comprises a metal with a thickness greater than or equal to 1 nm and less than or equal to 30 nm.   
     
     
         17 . The light-emitting device according to  claim 12 ,
 wherein the first electrode comprises at least one of silver and aluminum.   
     
     
         18 . A light-emitting device comprising:
 a first light-emitting element comprising a first electrode, a second electrode, and an electroluminescence layer including a light-emitting layer;   a second light-emitting element comprising the first electrode, a third electrode, and the electroluminescence layer including the light-emitting layer;   a third light-emitting element comprising the first electrode, a fourth electrode, and the electroluminescence layer including the light-emitting layer; and   a fourth light-emitting element comprising the first electrode, a fifth electrode, and the electroluminescence layer including the light-emitting layer,   wherein the second electrode comprises a first conductive film,   wherein the third electrode comprises a second conductive film, a third conductive film over the second conductive film, and a fourth conductive film over the third conductive film,   wherein the fourth electrode comprises the second conductive film, the third conductive film over the second conductive film, and a fifth conductive film over the third conductive film,   wherein the fifth electrode comprises the second conductive film, the third conductive film over the second conductive film, and a sixth conductive film over the third conductive film,   wherein each of the second conductive film, the fourth conductive film, the fifth conductive film, and the sixth conductive film comprises an oxide including indium,   wherein the third conductive film comprises silver, and   wherein an uppermost surface of the second electrode, the third electrode, the fourth electrode, and the fifth electrode are not aligned.   
     
     
         19 . The light-emitting device according to  claim 18 ,
 wherein the oxide including indium further comprises tin.   
     
     
         20 . The light-emitting device according to  claim 18 ,
 wherein the first light-emitting element is configured to emit light having a peak of an emission spectrum in at least one of a blue wavelength range, a green wavelength range, a yellow wavelength range, and a red wavelength range,   wherein the second light-emitting element is configured to emit light having a peak of an emission spectrum in a red wavelength range,   wherein the third light-emitting element is configured to emit light having a peak of an emission spectrum in a green wavelength range, and   wherein the fourth light-emitting element is configured to emit light having a peak of an emission spectrum in a blue wavelength range.   
     
     
         21 . The light-emitting device according to  claim 18 ,
 wherein the electroluminescence layer comprises a second light-emitting layer.   
     
     
         22 . The light-emitting device according to  claim 18 ,
 wherein the third conductive film comprises a metal with a thickness greater than or equal to 1 nm and less than or equal to 30 nm.   
     
     
         23 . The light-emitting device according to  claim 18 ,
 wherein the first electrode comprises at least one of silver and aluminum.