Photoelectrochemically active perovskite QDs/TiO inverse opal with enhanced photoluminescence intensity.

Photoluminescence intensity of the perovskite QDs coupled with TiO was decreased significantly owing to the electron transfer between them. Hererin, the composite of CsPb(ClBr) with TiO inverse opal was fabricated and we have proved that the effect of scattering of TiO inverse opal layer by layer under the incident excitation light for the enhancement of perovskite QDs photoluminescence intensity is far greater than the decrease of photoluminescence intensity caused by the electron transfer between QDs and TiO. Particularly, photoelectrochemical characterizations exhibit high charge separation effciency and fast response speed in water. This study opens new possibilities for optoelectronic and photo display applications of perovskites-based NCs.