Exploring resonant interaction between hybrid lead-halide perovskite quantum dots and plasmonic metal nanoparticles

The field of nanoplasmonics has been rapidly advancing due to its many applications in photovoltaics, displays and sensing. When excited at their resonance frequency, metallic nanoparticles can generate localized electric fields that can enhance optical properties of, or transfer energy to, surrounding media, which in our case is semiconductor quantum dots (QDs). The coupling between plasmonic nanoparticles and QD excitons has been extensively observed, displaying favorable characteristics such as reduced lifetime and suppressed blinking. While traditional CdSe QDs have most commonly been used for these studies, the interaction between hybrid lead-halide perovskite quantum dots (PQDs) and plasmonic nanoparticles remains to be investigated. PQDs have distinct advantages over conventional QDs, including high quantum yield and ease of compositional tunability. Utilizing wavelength-dependent photoluminescence spectroscopy and time-resolved photoluminescence spectroscopy, we study the nature of the plasmon-exciton coupling and its effect on PQD optical properties.