Mr. Jaewoo Ahn Profile

Jaewoo Ahn

at Dankook Univ

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Proceedings Article | 4 March 2019 Presentation

Fabrication of quantum-dot light-emitting devices using template-assisted self-assembly (Conference Presentation)

Jaewoo Ahn, Jung Seob Shim, Dong Hyun Lee

Proceedings Volume 10929, 109290B (2019) https://doi.org/10.1117/12.2508452

KEYWORDS: Quantum dots, Thin films, Zinc, Glasses, Bioalcohols, Oxygen, Plasma treatment, Spherical lenses, Quantum wells, Zinc oxide

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In this study, we demonstrate a unique method to fabricate quantum dots light emitting devices(QD-LEDs) using nanoporous templates. Zinc Oxide(ZnO) is spin-coated on ITO(Indium-Tin-Oxide) patterned glass as ETL(Electron-Transport-Layer). Cylinder-forming polystyrene-block-poly(2-vinyl pyridine) copolymer (S2VP) is spin-coated on the ETL layer. To induce phase separation, the thin films of block copolymers (BCPs) are solvent-annealed in vapor of toluene which is a good solvent for polystyrene blocks. As immersed in ethanol that is a selective solvent for P2VP blocks, the surface of BCP thin films is reconstructed and well-ordered nanopores are generated over the whole surface area. Then, the nanoporous templates are successfully fabricated on ETL layer by oxygen plasma treatment. The well-ordered nanopores on ETL can play a role as versatile templates to localize uniform spherical BCP micelles due to surface energy difference and topographical contrast during simple spin-coating process. In addition, well-ordered array of quantum dots(QDs) having hydrophobic surface is obtained by using ZnO layer. Interestingly, it is found that their population in a pore with diameter of about 40nm can be precisely controlled by adjusting the concentrations or the size of QDs as EML(Emissive-Layer). As the QDs have been selectively arranged in hexagonally packed nanopores with regular separation distance of about 80 nm, it is possible to generate extremely high density QDs arrays. Then, HTL(Hole-Transport-Layer), HIL(Hole-Injection-Layer), and Anode are deposited with thermal chemical vapor deposition. The QD-LED based on the hexagonal array of QDs may become one of key elements for the fabrication of a high resolution colour display.

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