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Strain Modulation for High Brightness Blue Luminescence of Pr3+-Doped Perovskite Nanocrystals via Siloxane Passivation
ACS Applied Electronic Materials ( IF 4.3 ) Pub Date : 2021-09-13 , DOI: 10.1021/acsaelm.1c00422
Xianghua Wang 1, 2 , Zhiliang Xu 1 , Shaoqi Zhuo 1, 2 , Peng Hu 1 , Yong Yang 1 , Bin Zhou 3 , Wen-Hua Zhang 3
Affiliation  

High performance CsPbBr3 nanocrystals (NCs) were synthesized via a hot injection method followed by a room-temperature ligand exchange modification using 3-mercaptopropyltrimethoxysilane (MPTMS). The ligand exchange promotes crystal growth and enhances the photoluminescence quantum yield (PLQY) of the NCs to near unity. The oscillator strength of the interband transition based on UV–vis absorption was surprisingly amplified by a factor of 2.5. The NC’s surface was passivated via S–Pb polar covalent bonding, which shifts the thermodynamic equilibrium and favors NC growth with a higher Br-to-Pb atomic ratio on the surface. Moreover, the perovskite lattice was strained by a cross-linked polymeric network of self-condensed siloxane. The strain within CsPbBr3 NCs was modulated by mixing at room temperature with Cs3PrCl6 NCs for controlled halide exchange and Pr doping; thereby blue emission from the Pr-doped CsPb(Cl/Br)3 NCs was achieved with optimized brightness (PLQY = 88%) at 464 nm.

中文翻译:

通过硅氧烷钝化对 Pr3+ 掺杂钙钛矿纳米晶体的高亮度蓝色发光进行应变调制

通过热注射法合成高性能 CsPbBr 3纳米晶体 (NC),然后使用 3-巯基丙基三甲氧基硅烷 (MPTMS) 进行室温配体交换改性。配体交换促进了晶体生长并将 NC 的光致发光量子产率 (PLQY) 提高到接近统一。基于紫外-可见吸收的带间跃迁的振荡器强度令人惊讶地放大了 2.5 倍。NC 的表面通过 S-Pb 极性共价键钝化,这改变了热力学平衡并有利于 NC 生长,表面上具有更高的 Br-Pb 原子比。此外,钙钛矿晶格被自缩合硅氧烷的交联聚合物网络拉紧。CsPbBr 3内的应变通过在室温下与 Cs 3 PrCl 6 NCs 混合来调节 NCs 以控制卤化物交换和 Pr 掺杂;因此,在 464 nm 处以优化的亮度(PLQY = 88%)实现了来自 Pr 掺杂的 CsPb(Cl/Br) 3 NCs 的蓝色发射。
更新日期:2021-09-28
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