Novel carbazole-acridine-based hole transport polymer for low turn-on voltage of green quantum dot light-emitting diodes
- Authors
- Kim, Chai Won; Lee, Ji Hye; Cho, Seunguk; Kim, Hyung Jong; Hwang, Jinhyo; Kim, Yong Woo; Choi, Dae Hyuk; Cho, Min Ju; Lee, Kwangyeol; Choi, Dong Hoon
- Issue Date
- 28-8월-2021
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- POLYMER CHEMISTRY, v.12, no.32, pp.4714 - 4721
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER CHEMISTRY
- Volume
- 12
- Number
- 32
- Start Page
- 4714
- End Page
- 4721
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/136800
- DOI
- 10.1039/d1py00497b
- ISSN
- 1759-9954
- 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 (mu(h)) of P-CzAc was estimated to be 2.24 x 10(-6) cm(2) V-1 s(-1), which is much higher than that of PVK (mu(h) = 4.11 x 10(-9) cm(2) V-1 s(-1)). In solution-processed green QD-LEDs, the P-CzAc-based device exhibited a relatively low turn-on voltage (V-on) of 2.8 V and a high maximum external quantum efficiency (EQE) of 11.6%. In comparison with a PVK-based device (V-on = 4.4 V; EQE = 8.6%), the P-CzAc-based device is more efficient owing to the significant improvement in hole injection.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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