Formation and Encapsulation of All-Inorganic Lead Halide Perovskites at Room Temperature in Metal-Organic Frameworks.

Authors:
Kyungkyou Noh
Kyungkyou Noh
Soongsil University
Wenping Yin
Wenping Yin
Sungkyunkwan University
Yongmin Park
Yongmin Park
‡School of Chemical Engineering
Tae Kyu Ahn
Tae Kyu Ahn
Yonsei University
Alvaro Mayoral
Alvaro Mayoral
The University of Texas at San Antonio
United States
Jaheon Kim
Jaheon Kim
Soongsil University
South Korea

J Phys Chem Lett 2019 May 23;10(9):2270-2277. Epub 2019 Apr 23.

School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.

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.

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http://dx.doi.org/10.1021/acs.jpclett.9b00510DOI Listing
May 2019
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