期刊
ADVANCED MATERIALS
卷 33, 期 23, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202007855
关键词
chemical stability; cross‐ linking; ligand kinetics; light‐ emitting diodes; micropatterning; perovskite quantum dots
类别
资金
- Basic Science Research Program of National Research Foundation of Korea (NRF) - Korea government (MEST) [NRF-2016R1A2B4013003, NRF-2018R1A2A3075144]
- GIST Research Institute (GRI) - GIST in 2021
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2020R1A6A3A01099729]
By controlling the ligand-binding kinetics, this work prevents surface defects in perovskite quantum dots, leading to an increase in photoluminescence quantum yield and improved environmental stability. The resulting cross-linked perovskite quantum dot film shows enhanced chemical stability without compromising optoelectrical properties, enabling the successful fabrication of high-resolution white electroluminescent devices by inkjet printing using green and red perovskite quantum dots.
Perovskite quantum dot (QD) light-emitting diodes (PeLEDs) are ideal for next-generation display applications because of their excellent color purity, high efficiency, and cost-effective fabrication. However, developing a technology for high-resolution multicolor patterning of perovskite QDs remains challenging, owing to the chemical instability of these materials. To overcome these issues, in this work, the generation of surface defects is prevented by controlling the ligand-binding kinetics using a stable ligand system (Stable LS). The crystalline reconstruction of perovskite QDs after addition of the Stable LS results in an approximate to 18% increase in their photoluminescence quantum yield in solution and it also improves the ambient stability of the perovskite QD solution. Moreover, the perovskite QDs with Stable LS can undergo cross-linking under UV irradiation. The tightly bridged perovskite QDs effectively prevent moisture-assisted ligand dissociation in film state due to the increased hydrophobicity and restricted movement of the cross-linked surface ligands. Thus, the cross-linked perovskite QD film shows improved chemical/environmental stability without substantial deterioration in optoelectrical properties. As a result, a white electroluminescent device with high resolution (approximate to 1 mu m) is successfully fabricated by inkjet printing using green and red perovskite QDs.
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