Light-emitting element, lighting device, and method for manufacturing lighting device and display device

A lighting device comprising:

• a first substrate;
• at least one first electrode over the first substrate;
• a first light-emitting layer located over the at least one first electrode and including a first emissive polymer and an ionic liquid;
• an ionic-liquid layer located over the first light-emitting layer and including an ionic liquid;
• a second light-emitting layer located over the ionic-liquid layer and including a second emissive polymer and an ionic liquid;
• at least one second electrode over the second light-emitting layer;
• a second substrate over the at least one second electrode;
• and
• a sealing layer located between the first substrate and the second substrate and surrounding the at least one first electrode.

A method for manufacturing a lighting device, the method comprising:

• forming a first electrode over a first substrate;
• forming a resin surrounding the first electrode over the first substrate;
• forming a first light-emitting layer including a first emissive polymer and an ionic liquid over the first electrode;
• forming a second electrode over a second substrate;
• forming a second light-emitting layer including a second emissive polymer and an ionic liquid over the second electrode;
• forming an ionic-liquid layer including an ionic liquid over the first light-emitting layer or the second light-emitting layer;
• bonding the first substrate and the second substrate so that the ionic-liquid layer is sandwiched by the first substrate and the second substrate;
• and
• curing the resin.