Geng Yuhao, Guo Jiazhuang, Wang Huiqing, Ling Si Da, Chen Zhuo, Chen Su, Xu Jianhong
The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineering, Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, Nanjing, 210009, China.
Small. 2022 May;18(19):e2200740. doi: 10.1002/smll.202200740. Epub 2022 Apr 10.
Cesium lead halide perovskite nanocrystals (CLHP NCs) have a wide range of potential applications benefited from the properties of high photoluminescence quantum yield (PLQY), wide luminous gamut, and narrow half peak width. However, due to the ionic nature and sensitivity to moisture, oxygen, or heat, perovskite nanocrystals are too fragile to maintain their crystal structure and optical properties. This work proposes solutions to two key issues in the development of CLHP NCs. First, a productive droplet-based microreactor system is designed to accomplish the scale-up production of CLHP NCs, obtaining sub-gram high-purity nanocrystal powders in a single production process. Second, CLHP NCs which are stable in polar solvents, air environment, and high temperature by using 3-aminopropyl triethoxysilane (APTES) as basic ligand are obtained. Wrapped with Si-O-Si generated by APTES, the CLHP NCs exhibit a longer fluorescence lifetime and higher quantum yield. Especially, the PLQY of CsPbBr @APTES can be stable at higher than 90% for more than 10 days. The Si-O-Si protective layer can also suppress the anion exchange between CsPbBr and CsPbI , maintaining the monochromaticity of nanocrystal luminescence. Eventually, full-spectrum quantum light-emitting diode (QLED) beads with robust nanocrystals are fabricated. The gamut of CsPbX @APTES encompasses 140% of the NTSC color gamut standard.
卤化铯铅钙钛矿纳米晶体（CLHP NCs）因其高光致发光量子产率（PLQY）、宽色域和窄半峰宽等特性而具有广泛的潜在应用。然而，由于其离子性质以及对水分、氧气或热量的敏感性，钙钛矿纳米晶体过于脆弱，难以维持其晶体结构和光学性质。这项工作针对CLHP NCs开发中的两个关键问题提出了解决方案。首先，设计了一种基于微滴的高效微反应器系统，以实现CLHP NCs的规模化生产，在单次生产过程中获得亚克级高纯度纳米晶体粉末。其次，通过使用3-氨丙基三乙氧基硅烷（APTES）作为碱性配体，获得了在极性溶剂、空气环境和高温下稳定的CLHP NCs。包裹在由APTES生成的Si-O-Si中，CLHP NCs表现出更长的荧光寿命和更高的量子产率。特别是，CsPbBr@APTES的PLQY在高于90%的水平下可稳定超过10天。Si-O-Si保护层还可以抑制CsPbBr和CsPbI之间的阴离子交换，保持纳米晶体发光的单色性。最终，制备出了具有稳定纳米晶体的全光谱量子发光二极管（QLED）珠。CsPbX@APTES的色域涵盖了NTSC色域标准的140%。
