Light emitting element and manufacturing method thereof
A light emitting element according to an embodiment includes a first electrode, a second electrode overlapping the first electrode, an emission layer disposed between the first electrode and the second electrode, and an electron transport region disposed between the emission layer and the second electrode, wherein the electron transport region includes a thermal acid generator (TAG). A method of manufacturing a light emitting element is also provided.
1 . A light emitting element comprising:
a first electrode;
a second electrode overlapping the first electrode;
an emission layer disposed between the first electrode and the second electrode; and
an electron transport region disposed between the emission layer and the second electrode, wherein the electron transport region comprises a thermal acid generator (TAG) and inorganic nanoparticles,
wherein the TAG generates H + upon thermal treatment, and wherein the H + is adsorbed on the inorganic nanoparticles, and
wherein the inorganic nanoparticles comprise zinc oxide (ZnO).
2 . The light emitting element of claim 1 , wherein
the electron transport region comprises a material in which H + is separated from the TAG.
3 . The light emitting element of claim 1 , wherein
the TAG comprises a sulfonate-based compound.
4 . The light emitting element of claim 3 , wherein
the TAG comprises a compound represented by Chemical Formula 1:
wherein in Chemical Formula 1,
R 1 and R 2 are each independently a substituted or unsubstituted C3 to C40 alkyl group, a substituted or unsubstituted C3 to C40 aliphatic hydrocarbon group, a substituted or unsubstituted C6 to C40 aromatic hydrocarbon group of C6 to C40, or a combination thereof.
5 . The light emitting element of claim 4 , wherein
the compound represented by Chemical Formula 1 comprises at least one compound each independently represented by one of Chemical Formula 2-1, Chemical Formula 2-2, Chemical Formula 2 -3, Chemical Formula 2-4, Chemical Formula 2-5, Chemical Formula 2-6, Chemical Formula 2-7, Chemical Formula 2-8, Chemical Formula 3-1, Chemical Formula 3-2, Chemical Formula 3-3, Chemical Formula 3-4, Chemical Formula 3-5, and Chemical Formula 3-6:
6 . The light emitting element of claim 1 , wherein
the emission layer comprises quantum dots.
7 . The light emitting element of claim 1 , wherein
the first electrode is an anode,
the second electrode is a cathode, and
the electron transport region comprises at least one of a hole blocking layer, an electron transport layer, and an electron injection layer.
8 . A method of manufacturing a light emitting element, comprising:
forming a first electrode;
forming an emission layer on the first electrode;
forming an electron transport region on the emission layer; and
forming a second electrode on the electron transport region, wherein
the forming of the electron transport region comprises:
applying a solution including inorganic nanoparticles and a thermal acid generator (TAG); and
curing the solution,
wherein the TAG generates H + upon thermal treatment, and wherein the H + is adsorbed on the inorganic nanoparticles,
wherein in the curing of the solution, the TAG generates H + ,
wherein the H+ generated in the curing separates a branch part adsorbed on the inorganic nanoparticle.
9 . The method of manufacturing the light emitting element of claim 8 , wherein the TAG comprises a sulfonate-based compound.
10 . The method of manufacturing the light emitting element of claim 9 , wherein the TAG comprises a compound represented by Chemical Formula 1:
wherein in Chemical Formula 1,
R 1 and R 2 are each independently a substituted or unsubstituted C3 to C40 alkyl group, a substituted or unsubstituted C3 to C40 aliphatic hydrocarbon group, a substituted or unsubstituted C6 to C40 aromatic hydrocarbon group of C6 to C40, or a combination thereof.
11 . The method of manufacturing the light emitting element of claim 9 , wherein the compound represented by Chemical Formula 1 comprises at least one compound each independently represented by one of Chemical Formula 2-1 to Chemical Formula 2-8:
12 . The method of manufacturing the light emitting element of claim 9 , wherein the compound represented by Chemical Formula 1 comprises at least one compound each independently represented by one of Chemical Formula 3-1 to Chemical Formula 3-6:
13 . The method of manufacturing the light emitting element of claim 9 , wherein the emission layer comprises quantum dots.
14 . The method of manufacturing the light emitting element of claim 9 , wherein the curing is carried out at a first temperature in a range of about 100 degrees (° C.) to about 150 degrees (° C.).
15 . The method of manufacturing the light emitting element of claim 14 , further comprising aging after the curing of the solution.
16 . The method of manufacturing the light emitting element of claim 15 , wherein the aging is carried at a second temperature that is lower than the first temperature.