General Mild Reaction Creates Highly Luminescent Organic-Ligand-Lacking Halide Perovskite Nanocrystals for Efficient Light-Emitting Diodes
| Autor: | Shuai Yuan, Osman M. Bakr, Baoquan Sun, Bin-Bin Zhang, Liang-Sheng Liao, Xue-Chun Wang, Huaibin Shen, Yang Zhou, Wei Zheng, Jingshan Hou, Ju-Ping Ma, Xueyuan Chen, Hong-Tao Sun |
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| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Chemistry business.industry Halide General Chemistry 010402 general chemistry 01 natural sciences Biochemistry Catalysis Effective nuclear charge 0104 chemical sciences law.invention Colloid and Surface Chemistry Nanocrystal law Optoelectronics Quantum efficiency Luminescence business Perovskite (structure) Light-emitting diode |
| Zdroj: | Journal of the American Chemical Society. 141:15423-15432 |
| ISSN: | 1520-5126 0002-7863 |
| Popis: | The presence of labile bulky insulating hydrocarbon ligands in halide perovskite nanocrystals (NCs) passivates surface traps but concurrently makes charge transport difficult in optoelectronic devices. Early efforts routinely rely on the replacement of long-chain ligands with short-chain cousins, leading to notable changes in NC's sizes and photophysical properties and thus making it hard to obtain devices with nearly designed emissions. Here we report a general solution-phase ligand-exchange strategy to produce organic-ligand-lacking halide perovskite NCs with high photoluminescence (PL) quantum yields and good stability in ambient air. We demonstrate that the ligand exchange can be achieved by a well-controlled mild reaction of thionyl halide with the carboxylic and amine groups on the NC's surface, resulting in nearly dry NCs with well-passivated surfaces and almost unaltered emission characteristics. Consequently, we achieve exceptionally high-performance blue perovskite NC light-emitting diodes (LEDs) with an external quantum efficiency of up to 1.35% and an extremely narrow full width at half-maximum of 14.6 nm. Our work provides a systematic framework for preparing high-quality organic-ligand-lacking perovskite NC inks that can be directly cast as films featuring effective charge transport, thereby providing the foundation for further development of a wide range of efficient perovskite optoelectronic devices. |
| Databáze: | OpenAIRE |
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