Solution-Processed Efficient Perovskite Nanocrystal Light-Emitting Device Utilizing Doped Hole Transport Layer

Xinyu Shen; Hua Wu; Xiaoyu Zhang; Meili Xu; Junhua Hu; Jinyang Zhu; Bin Dong; William W Yu; Xue Bai

doi:10.1021/acs.jpclett.0c03047

Solution-Processed Efficient Perovskite Nanocrystal Light-Emitting Device Utilizing Doped Hole Transport Layer

J Phys Chem Lett. 2021 Jan 14;12(1):94-100. doi: 10.1021/acs.jpclett.0c03047. Epub 2020 Dec 11.

Authors

Xinyu Shen¹, Hua Wu¹, Xiaoyu Zhang¹, Meili Xu¹, Junhua Hu², Jinyang Zhu², Bin Dong³, William W Yu⁴, Xue Bai¹

Affiliations

¹ State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun 130012, China.
² State Centre for International Cooperation on Designer Low-carbon & Environmental Materials, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
³ Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Nationalities University, Dalian 116600, China.
⁴ Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana 71115, United States.

PMID: 33306374
DOI: 10.1021/acs.jpclett.0c03047

Abstract

Light-emitting devices (LEDs) with inorganic perovskite nanocrystals (PNCs) fabricated through the all-solution process have tremendous potential for new-generation illumination and displays on account of their large area and cost-effective manufacturing. However, the development of efficient solution-processed PNC LEDs remains challenge, which mainly results from the fact that only a few types of charge transport layers can be employed for the subsequent deposition steps, thus leading to injection barriers and charge injection imbalance inside these LEDs. Herein 4,4'-bis(carbazole-9-yl) biphenyl (CBP) is introduced as a dopant into the poly(9,9-dioctylfluorene-co-N-(4-(3-methylpropyl)) diphenylamine) (TFB) hole transport layer (HTL), which efficiently modulates the mobility of charge carrier as well as the energy level of the HTL, resulting in the barrier-free injection of the charge carrier in the as-fabricated solution-processed PNC LEDs. Consequently, the luminance of red LEDs (688 nm) reaches 2990 cd m^-2, and the external quantum efficiency achieves 8.1%, which is the optimal performance for solution-processed PNC LEDs to date. Additionally, the turn-on voltage and roll-off have also been improved by the more balanced charge injection.