Direct Photolithographic Patterning of Colloidal Quantum Dots Enabled by UV-Crosslinkable and Hole-Transporting Polymer Ligands

Jaewan Ko, Jun Hyuk Chang, Byeong Guk Jeong, Hyung Jong Kim, Joonyoung F. Joung, Sungnam Park, Dong Hoon Choi, Wan Ki Bae, Joona Bang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Quantum dot (QD)-based displays call for nondestructive, high-throughput, and high-resolution patterning techniques with micrometer precision. In particular, self-emissive QD-based displays demand fine patterns of conductive QD films with uniform thickness at the nanometer scale. To meet these requirements, we functionalized QDs with photopatternable and semiconducting poly(vinyltriphenylamine-random-azidostyrene) (PTPA-N3-SH) ligands in which hole-transporting triphenylamine and UV-crosslinkable azide (-N3) groups are integrated. The hybridized QD films undergo chemical crosslinking upon UV irradiation without loss in the luminescence efficiency, enabling micrometer-scale QD patterns (pitch size down to ∼10 μm) via direct photolithography. In addition, the conjugated moieties in the ligands allow the crosslinked QD films to be used in electrically driven light-emitting diodes (LED). As the ultimate achievement, a patterned QD-LED was prepared with a maximum luminance of 11720 cd m-2 and a maximum external quantum efficiency (EQE) of 6.25%. The present study offers a simple platform to fabricate conductive nanoparticle films with micrometer-scale patterns, and thus we anticipate that this system will expedite the realization of QD-based displays and will also be applicable to the manufacture of nanoparticles for other electronic devices.

Original languageEnglish
Pages (from-to)42153-42160
Number of pages8
JournalACS Applied Materials and Interfaces
Volume12
Issue number37
DOIs
Publication statusPublished - 2020 Sep 16

Keywords

  • UV crosslinking
  • colloidal quantum dots
  • light-emitting diodes
  • micropatterns
  • photolithography
  • polymer ligands

ASJC Scopus subject areas

  • Materials Science(all)

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