CsPbX3(X=Br,I)@ZIF-8 Composites for High-Efficiency WLED Devices
Pure inorganic cesium-lead-halide perovskite materials have attracted much attention in optoelectronic devices due to their high photoluminescence quantum yield(PLQY),high color purity,tunable bandgap,and high carrier mobility.However,the poor stabil-ity under conditions with water and oxygen limits its practical use.In order to enhance the stability under the environments containing water and oxygen,ZIF-8 powder synthesized by the dry nanoparticle self-assembly method was incorporated in the typical thermal injection method to synthesize the perovskite nanocrystals in-situ in the ZIF-8 pores to obtain CsPbX3@ZIF-8(X=Br,I)composite powders.The method is simple to carry out and the cost is low.The synthesized composite powders can be stabilized in air for more than 2 years,and the bright fluorescence emission is still observed after 15 days in water.The CsPbX3@ZIF-8/PMMA(X=Br,I)films prepared with PMMA as a matrix have good optical properties,with green CsPbBr3@ZIF-8/PMMA film emitting photoluminescence peak wavelength of 525 nm,and red CsPbI3@ZIF-8/PMMA film emitting photoluminescence peak wavelength of 697 nm,respectively.Together with a blue LED as a light source,the prepared WLED device has a white light chromaticity coordinates of(0.311 2,0.333 4),a color temperature of 6 552 K,and a color rendering index(CRI)of 73.6.
pure inorganic cesium lead halide perovskiteZIF-8hot injectionstabilityin situ growthWLED
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