Abstract
The laser-induced phase segregation effect and dynamic evolution of room-temperature photoluminescence (PL) from mixed halide colloidal nanoparticles of CH3NH3Pb(Br0.5I0.5)3 are presented. UV laser-assisted compositional changes are observed in PL when the nanoparticles are surface-functionalized with different halide based long alkylammonium moieties (C8H17NH3X; X = Cl, Br or I). The C8H17NH3Cl passivation produced a remarkable 100 nm relative blue shift in the mixed-phase PL peak position, while C8H17NH3Br shows a 15 nm blue-shift and C8H17NH3I produced a red-shift of about 10 nm. The results are direct evidence of laser-assisted reversible phase segregation, halide ion diffusion from surface ligand to nanoparticles, and the effect of surface functionalization on photo-assisted bandgap engineering. These studies provide a broad understanding of various dynamically evolving emission pathways in such mixed hybrid materials when they are functionalized with diverse halide based organic moieties.
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