钙钛矿纳米晶体(PNC)具有广泛应用的巨大潜力,如颜色转换,X射线闪烁体,和活性激光介质。然而,差的固有稳定性和对包括水分和氧气的环境刺激的高敏感性已成为PNC材料商业化的瓶颈。适当的阻隔材料设计可以有效地提高PNC的稳定性。特别是,在有机硅基质中包装PNC的策略可以整合基于无机氧化物和基于聚合物的封装路线的优势。然而,惰性长碳链配体(例如,油酸,油胺)用于硅基封装的当前配体体系对有机硅基质的交联有害,导致纳米晶体薄膜的性能不足,如低透明度和大的表面粗糙度。在这里,我们提出了一种由(3-氨基丙基)三乙氧基硅烷(APTES)和(3-氨基丙基)三乙氧基硅烷与戊二酸酐(APTES-PA)组成的双有机硅配体体系,取代惰性长碳链配体,提高有机硅包覆PNC薄膜的性能。因此,通过容易的溶液流延方法制备的强荧光PNC膜表现出高透明度和降低的表面粗糙度,同时在各种恶劣环境中保持高稳定性。优化后的PNC薄膜最终作为闪烁体应用于X射线成像系统中,显示20lp/mm以上的高空间分辨率。通过设计这种有前途的用于PNC薄膜的双有机硅配体体系,我们的工作强调了封端配体的分子结构对PNC膜的光学性能的关键影响。
Perovskite nanocrystals (PNCs) bear a huge potential for widespread applications, such as color conversion, X-ray scintillators, and active laser media. However, the poor intrinsic stability and high susceptibility to environmental stimuli including moisture and oxygen have become bottlenecks of PNC materials for commercialization. Appropriate barrier material design can efficiently improve the stability of the PNCs. Particularly, the strategy for packaging PNCs in organosilicon matrixes can integrate the advantages of inorganic-oxide-based and polymer-based encapsulation routes. However, the inert long-carbon-chain ligands (e.g., oleic acid, oleylamine) used in the current ligand systems for silicon-based encapsulation are detrimental to the cross-linking of the organosilicon matrix, resulting in performance deficiencies in the nanocrystal films, such as low transparency and large surface roughness. Herein, we propose a dual-organosilicon ligand system consisting of (3-aminopropyl)triethoxysilane (APTES) and (3-aminopropyl)triethoxysilane with pentanedioic anhydride (APTES-PA), to replace the inert long-carbon-chain ligands for improving the performance of organosilicon-coated PNC films. As a result, strongly fluorescent PNC films prepared by a facile solution-casting method demonstrate high transparency and reduced surface roughness while maintaining high stability in various harsh environments. The optimized PNC films were eventually applied in an X-ray imaging system as scintillators, showing a high spatial resolution above 20 lp/mm. By designing this promising dual organosilicon ligand system for PNC films, our work highlights the crucial influence of the molecular structure of the capping ligands on the optical performance of the PNC film.