Relationship between microstructure and optical properties of a novel perovskite C12PbI4 embedded in matrix of porous alumina

In this study, organic–inorganic hybrid perovskite multiple quantum wells (PbI QWs) embedded in porous anodic alumina (PAA) thin films on glass and aluminum substrates are investigated in detail. The pore height and diameter of the nanoscale structure of porous anodic alumina (PAA) film produced by the anodization technique are controllable. The synthesized films are characterized morphologically using the atomic force microscopy (AFM). Scanning electron microscopy (SEM) study showed granular surface. The structural and optical properties were investigated by X-ray diffraction (XRD), photoluminescence (PL) and UV–Vis–NIR spectrophotometer. The effect of the two different substrates on the impregnation of the PbI QW in the PAA is presented. Both PL and AFM studies show a better penetration of the PbI QW in the case of the Al substrate providing a wider pore diameter. Remarkable enhancement of quantum confinement is demonstrated.

► Blue-shifted PL and a better quantum confinement after impregnation of the perovskite on the matrix of PAA.
► Strong and narrow excitonic absorption and PL.
► New approach to realize novel optoelectronic devices and luminescent materials.