Novel carbazole-acridine-based hole transport polymer for low turn-on voltage of green quantum dot light-emitting diodes

Chai Won Kim, Ji Hye Lee, Seunguk Cho, Hyung Jong Kim, Jinhyo Hwang, Yong Woo Kim, Dae Hyuk Choi, Min Ju Cho, Kwangyeol Lee, Dong Hoon Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Herein, a novel hole transport polymer, P-CzAc, for solution-processed green quantum dot light-emitting diodes (QD-LEDs) was synthesized. P-CzAc consists of a polystyrene backbone and 10-(9H-carbazol-3-yl)-9,9-dimethyl-9,10-dihydroacridine as side-chain pendants. The design strategy aims to improve the hole transportability and achieve the low-lying highest occupied molecular orbital (HOMO) level for P-CzAc for reducing the charge injection barrier from the hole injection layer to the hole transport layer. P-CzAc showed good solubility in tetrahydrofuran, methylene chloride, and aromatic solvents, but high solvent tolerance for hexane and octane, similar to poly(N-vinylcarbazole) (PVK). Compared to PVK (HOMO = -5.58 eV), P-CzAc exhibited a relatively high-lying HOMO level of -5.33 eV. In particular, the hole mobility (μh) of P-CzAc was estimated to be 2.24 × 10-6 cm2 V-1 s-1, which is much higher than that of PVK (μh = 4.11 × 10-9 cm2 V-1 s-1). In solution-processed green QD-LEDs, the P-CzAc-based device exhibited a relatively low turn-on voltage (Von) of 2.8 V and a high maximum external quantum efficiency (EQE) of 11.6%. In comparison with a PVK-based device (Von = 4.4 V; EQE = 8.6%), the P-CzAc-based device is more efficient owing to the significant improvement in hole injection.

Original languageEnglish
Pages (from-to)4714-4721
Number of pages8
JournalPolymer Chemistry
Volume12
Issue number32
DOIs
Publication statusPublished - 2021 Aug 28

ASJC Scopus subject areas

  • Bioengineering
  • Biochemistry
  • Organic Chemistry
  • Polymers and Plastics

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