DataVXACS Energy LettersPaper
journal article·2025-03-14

Multisite Coordination Ligand Strategy for FAPbBr3 Nanocrystal Light-Emitting Diodes

Dongryeol Lee, Seung Min Lee, Ah-young Lee, Jongbeom Kim, Jeongjae Lee, Dae Hyeon Kwon, Jongmin Han, Young Wook Noh, Woo Gyeong Shin, Su Seok Choi, Bo Ram Lee, Seungjin Lee, Sang Kyu Kwak, Myoung Hoon Song

ACS Energy Letters· Volume 10· Issue 3
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Source abstract

Abstract

Passivation strategies have been proven to improve the optoelectronic properties of perovskite nanocrystals (PNCs) and to suppress their ion migration; however, previous studies have predominantly focused on their binding affinity to uncoordinated Pb 2+ ions, overlooking additional interactions with monovalent cations. Here, we introduce multisite coordination ligands (composed of multiple fluorine atoms) to achieve additional interactions with formamidinium lead bromide (FAPbBr 3 ) PNCs. One fluorine atom passivates an uncoordinated Pb 2+ ion, while the other fluorine atoms form hydrogen bonds with the surrounding FA + ions, thereby strongly binding to the PNC surface and suppressing ion migration. This strong passivation enables postsynthetic ligand exchange using polar solvents without compromising the optoelectronic properties of PNCs by protecting them from polar solvents. As a result, we achieve efficient PNC-LEDs with a maximum external quantum efficiency (EQE) of 25.2% at a luminance of 4474 cd m –2, maintaining an EQE of over 20% up to approximately 8000 cd m –2 .
Source: openalex_inverted_index · Quality: baseline

Research context

NanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Optical properties and cooling technologies in crystalline materials · Luminescence Properties of Advanced Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Material Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea

School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea

Department of Materials Science and Engineering and Research Institute of Advanced Materials (RIAM)

Seoul National University

Department of Chemical and Biological Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea

Department of Electrical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam Gu, Pohang, Gyeongbuk 37673, Republic of Korea

School of Advanced Materials Science and Engineering

Sungkyunkwan University

Department of Energy Engineering, Korea Institute of Energy Technology (KENTECH) 21, Kentek-gil, Naju-si, Jeollanam-do 58330, Republic of Korea

Funding

Samsung · National Research Foundation of Korea

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