Display device, method for producing display device, and aqueous solution
A hole injection layer included in a display device according to the disclosure contains a mixture (PEDOT/PSS) obtained by mixing polystyrene sulfonic acid (PSS) with polyethylenedioxythiophene (PEDOT), and a polymer adjacent to the PEDOT/PSS.
1 . A display device comprising:
an anode;
a hole injection layer;
a first light-emitting layer that emits light of a first color; and
a cathode,
wherein;
the hole injection layer contains;
a mixture of PEDOT/PSS (PEDOT/PSS) in which polystyrene sulfonic acid (PSS) is mixed with polyethylenedioxythiophene (PEDOT), and
a first polymer adjacent to the PEDOT/PSS mixture,
the first polymer is a crosslinked polymer obtained by crosslinking a second polymer, and
the second polymer is a water-soluble polymer.
2 . The display device according to claim 1 ,
wherein the first polymer exhibits alkali resistance.
3 . The display device according to claim 2 ,
wherein the first polymer is insoluble in an alkaline solution of pH11 or higher.
4 . The display device according to claim 2 ,
wherein the first polymer contains at least one polymer selected from the group consisting of polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), gelatin, nylon, acrylic, urethane, polyester, polyether, melamine, epoxy, polyethyleneimine, and polyethylene oxide.
5 . The display device according to claim 1 , further comprising:
a second light-emitting layer that emits light of a second color different from the first color.
6 . The display device according to claim 1 ,
wherein the hole injection layer is a single layer.
7 . The display device according to claim 1 ,
wherein the anode includes a first pixel electrode and a second pixel electrode, and
the hole injection layer includes a first portion overlapping the first pixel electrode and a second portion overlapping the second pixel electrode, the first portion being separated from the second portion.
8 . The display device according to claim 1 ,
wherein the hole injection layer includes:
a lower layer containing the PEDOT/PSS mixture, and
an upper layer containing the first polymer and covering the lower layer.
9 . A display device comprising:
an anode;
a hole injection layer;
a first light-emitting layer that emits light of a first color; and
a cathode,
wherein:
the hole injection layer contains:
a mixture of PEDOT/PSS in which polystyrene sulfonic acid (PSS) is mixed with polyethylenedioxythiophene (PEDOT), and
a first polymer adjacent to the PEDOT/PSS mixture, and the first polymer exhibits alkali resistance.
10 . The display device according to claim 9 ,
wherein the first polymer is insoluble in an alkaline solution of pH11 or higher.
11 . The display device according to claim 9 ,
wherein the first polymer contains at least one polymer selected from the group consisting of polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), gelatin, nylon, acrylic, urethane, polyester, polyether, melamine, epoxy, polyethyleneimine, and polyethylene oxide.
12 . The display device according to claim 9 , further comprising:
a second light-emitting layer that emits light of a second color different from the first color.
13 . The display device according to claim 9 ,
wherein the hole injection layer is a single layer.
14 . The display device according to claim 9 ,
wherein the anode includes a first pixel electrode and a second pixel electrode, and
the hole injection layer includes a first portion overlapping the first pixel electrode and a second portion overlapping the second pixel electrode, the first portion being separated from the second portion.
15 . The display device according to claim 9 ,
wherein the hole injection layer includes:
a lower layer containing the PEDOT/PSS mixture, and
an upper layer containing the first polymer and covering the lower layer.