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Fast Formation and Encapsulation of All-inorganic Lead Halide Perovskites at Room Temperature in Metal-Organic Frameworks.
Journal of Physical Chemistry Letters 2019 April 20
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 halide perovskites (CsPbX3 ; 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 (PbX2 ) was impregnated into the MOF pores to give PbX2 @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 CsPbX3 @MIL-101 composites with X3 = Cl3 , Cl2 Br, Br2 Cl, Br3 , Br2 I, I2 Br, and I3 that exhibit gradual variation of band-gap energies and tuned emission wavelengths from 417 to 698 nm.
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