Cha Ji-Hyun, Noh Kyungkyou, Yin Wenping, Lee Yongju, Park Yongmin, Ahn Tae Kyu, Mayoral Alvaro, Kim Jaheon, Jung Duk-Young, Terasaki Osamu
Department of Chemistry, Sungkyunkwan Advanced Institute of Nano Technology , Sungkyunkwan University , 2066 Seobu-Ro , Jan-gan-Gu, Suwon , Gyeonggi-do 16419 , Republic of Korea.
Department of Information Communication, Materials, and Chemistry Convergence Technology , Soongsil University , 369 Sangdo-Ro , Dongjak-Gu, Seoul 06978 , Republic of Korea.
J Phys Chem Lett. 2019 May 2;10(9):2270-2277. doi: 10.1021/acs.jpclett.9b00510. Epub 2019 Apr 23.
Improving the stability and tuning the optical properties of semiconducting perovskites are vital for their applications in advanced optoelectronic devices. We present a facile synthetic method for hybrid composites of perovskites and metal-organic frameworks (MOFs). A simple two-step solution-based method without organic surfactants was employed to make all-inorganic lead-halide perovskites (CsPbX; X = Cl, Br, I, or mixed halide compositions) form directly in the pores of MIL-101 MOF. That is, a polar organic solution of lead halide (PbX) was impregnated into the MOF pores to give PbX@MIL-101, which was then subjected to a perovskite-formation reaction with cesium halide (CsX) dissolved in methanol. The compositions of the halogen anions in the perovskites can be modulated with various halide precursors, leading to CsPbX@MIL-101 composites with X = Cl, ClBr, BrCl, Br, BrI, IBr, and I that exhibit gradual variation of band gap energies and tuned emission wavelengths from 417 to 698 nm.
提高半导体钙钛矿的稳定性并调节其光学性质对于它们在先进光电器件中的应用至关重要。我们提出了一种用于钙钛矿与金属有机框架（MOF）杂化复合材料的简便合成方法。采用一种简单的无有机表面活性剂的两步溶液法，使全无机铅卤化物钙钛矿（CsPbX；X = Cl、Br、I或混合卤化物组成）直接在MIL-101 MOF的孔中形成。也就是说，将卤化铅（PbX）的极性有机溶液浸渍到MOF孔中得到PbX@MIL-101，然后使其与溶解在甲醇中的卤化铯（CsX）进行钙钛矿形成反应。通过各种卤化物前驱体可以调节钙钛矿中卤素阴离子的组成，从而得到X = Cl、ClBr、BrCl、Br、BrI、IBr和I的CsPbX@MIL-101复合材料，这些复合材料表现出带隙能量的逐渐变化以及从417到698 nm的发射波长调谐。
