Quantitative coassemblies of perovskite and gold nanocrystals with efficient radiative recombination enable high-performance microlaser arrays

Metal halide perovskites have rapidly emerged as outstanding semiconductors for laser applications. Surface plasmon resonances of metals offer a platform for improving the perovskite lasing properties of metal halide perovskites by accelerating radiative recombination. However, the constraint on degrees of freedom of perovskite-metal interactions in two dimensions keeps us from getting a full picture of plasmon-involved carrier dynamics and reaching the optimum perovskite lasing performance. Here we report a strategy of synthesizing quantitative coassemblies of perovskite and metal nanocrystals for studying the effect of surface plasmons on carrier dynamics in depth and exploring plasmon-enhanced perovskite lasing performance. Within the coassembly, each metal nanocrystal supports localized surface plasmon resonances capable of accelerating radiative recombination of all adjacent perovskite nanocrystals in three dimensions. The quantitative coassemblies disclose the evolution of radiative and nonradiative recombination processes in perovskite nanocrystals with the plasmon modes, identifying an optimal metal nanocrystal content for fulfilling the highest radiative efficiency in perovskite nanocrystals. By virtue of accelerated radiative recombination, the coassemblies of perovskite and metal nanocrystals allowed for the construction of microlaser arrays with enhanced performance including low thresholds and ultrafast outputs. This work fundamentally advances the perovskite-metal systems for plasmonically enhancing perovskite optoelectronic performance. Graphical