Photonic Enhancement in Photoluminescent Metal Halide Perovskite–Photonic Crystal Bead Hybrids

The integration of photonic materials with semiconductor nanocrystals by correlating the photonic stopband and the photoluminescence maximum is expected to afford hybrid materials with enhanced optoelectronic properties. Here, we report two photonic crystal–perovskite nanocrystal microbead hybrids synthesized through simple vacuum drying techniques. Photonic polystyrene microbeads combined with metal halide perovskite (CsPbBr3 and CsPbBr1.5Cl1.5) nanocrystals yield hybrids with photoluminescence matching that of the parent nanocrystals and increased photoluminescence quantum yields. Time-resolved photoluminescence spectroscopy quantifies the radiative enhancement afforded by the photonic environment of the microbeads. These nanocrystal–microbead hybrids also demonstrate markedly better resistance to degradation in water over 30 days of immersion compared to their colloidal counterparts.