Simultaneous enhancement of luminescence and stability of lead halide perovskites by a diatomite microcavity for light-emitting diodes

Lead halide perovskite quantum dots (Pe QDs) are revolutionizing the photoelectric field and hold considerable potential for future applications. However, the simultaneous promotion of both high luminescence performance and excellent stability is still a major challenge for its practical application. Herein, we presented a diatomite mineral with naturally optical microcavity is used to construct polyacrylic acid-grafted diatomite (DE-g-PAA) mediate reactors for in-situ crafting CsPbX3 QDs (X = Cl, Br and I). The as-prepared CPB (CsPbBr3) -DE-g-PAA composite emitters not only preserve a higher photoluminescence quantum yield about 76.4% ± 0.7% compared to 33.1% ± 0.5% for CPB but also present outstanding thermal stability and water-resistance property. This luminescence improvement further be confirmed as the electromagnetic field enhancement from resonance effect of cavities with uniform size in the diatomite via electromagnetic field simulations. This study provides new insights for achieving stable and highly efficient CsPbX3 QDs-based multifunctional materials using natural clay minerals with quasi-photonic crystal structure.