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Strain engineering of perovskite quantum dots (pQDs) enables widely-tunablephotonic device applications. However, manipulation at the single-emitter levelhas never been attempted. Here, we present a tip-induced control approachcombined with tip-enhanced photoluminescence (TEPL) spectroscopy to engineerstrain, bandgap, and emission quantum yield of a single pQD. SingleCsPbBr$_{x}$I$_{3-x}$ pQDs are clearly resolved through hyperspectral TEPLimaging with $\sim$10 nm spatial resolution. The plasmonic tip then directlyapplies pressure to a single pQD to facilitate a bandgap shift up to $\sim$62meV with Purcell-enhanced PL quantum yield as high as $\sim$10$^5$ for thestrain-induced pQD. Furthermore, by systematically modulating the tip-inducedcompressive strain of a single pQD, we achieve dynamical bandgap engineering ina reversible manner. In addition, we facilitate the quantum dot coupling for apQD ensemble with $\sim$0.8 GPa tip pressure at the nanoscale. Our approachpresents a new strategy to tune the nano-opto-electro-mechanical properties ofpQDs at the single-crystal level.

Tip-induced strain, bandgap, and radiative decay engineering of a single metal halide perovskite quantum dot