Efficient and Stable Blue- and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 Purification
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Title
Efficient and Stable Blue- and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 PurificationAuthor (s)
Date
2021-11-11Publisher
American Chemical SocietyBibliographic citation
LEE, ChaeHyun, et al. Efficient and Stable Blue-and Red-Emitting Perovskite Nanocrystals through Defect Engineering: PbX2 Purification. Chemistry of Materials, 2021, 33 (22), 8745-8757.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionAbstract
Current efforts to reduce the density of structural defects such as surface passivation, doping, and modified synthetic protocols have allowed us to grow high-quality perovskite nanocrystals (PNCs). However, the role ... [+]
Current efforts to reduce the density of structural defects such as surface passivation, doping, and modified synthetic protocols have allowed us to grow high-quality perovskite nanocrystals (PNCs). However, the role of the purity of the precursors involved during the PNC synthesis to hinder the emergence of defects has not been widely explored. In this work, we analyzed the use of different crystallization processes of PbX2 (X = Cl– or I–) to purify the chemicals and produce highly luminescent and stable CsPbCl3–xBrx and CsPbI3 PNCs. The use of a hydrothermal (Hyd) process to improve the quality of the as-prepared PbCl2 provides blue-emitting PNCs with efficient ligand surface passivation, a maximum photoluminescence quantum yield (PLQY) of ∼ 88%, and improved photocatalytic activity to oxidize benzyl alcohol, yielding 40%. Then, the hot recrystallization of PbI2 prior to Hyd treatment led to the formation of red-emissive PNCs with a PLQY of up to 100%, long-term stability around 4 months under ambient air, and a relative humidity of 50–60%. Thus, CsPbI3 light-emitting diodes were fabricated to provide a maximum external quantum efficiency of up to 13.6%. We claim that the improvement of the PbX2 crystallinity offers a suitable stoichiometry in the PNC structure, reducing nonradiative carrier traps and so maximizing the radiative recombination dynamics. This contribution gives an insight into how the manipulation of the PbX2 precursor is a profitable and potential alternative to synthesize PNCs with improved photophysical features by making use of defect engineering. [-]
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Chem. Mater. 2021, 33 (22)Funder Name
European Research Council (ERC) | Ministry of Science, Innovation, Spain | Generalitat Valenciana | Universitat Jaume I | National Research Foundation of Korea (NRF) | Ministry of Education, Youth and Sports, Czech Republic
Project code
724424-No-LIMIT | Project STABLE (PID2019-107314RB-I00) | Project ELECTROVAL (PID2020- 116093RB-C41) | Prometeo Grant Q-Devices (Prometeo/2018/098) | UJI-B2020- 50 | BK21 FOUR (Brain Korea 21 Four ) 2019R1F1A1062395 | BK21 FOUR (Brain Korea 21 Four ) 2021R1F1A1063382 | project LM 2018103 | POSDOC/ 2019/20
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American Chemical Society
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