Seeds-Assisted Space-Confined Growth of All-Inorganic Perovskite Arrays for Ultralow-Threshold Single-Mode Lasing

All-inorganic lead halide perovskites have gained wide attention as a class of promising material for both fundamental investigations and optoelectronic applications due to their excellent optical properties. They simultaneously possess relatively high refractive index and high exciton binding energy exceeding 100 meV, making them possess high emission efficiency at room temperature and thus promise a coherent light source. High-quality all-inorganic lead halide perovskite microcrystal arrays exhibiting ultralow-threshold single-mode lasing would find promising applications in the on-chip integration of photonic and electronic circuits. However, currently it is still challenging to synthesize high-quality all-inorganic perovskite arrays. Here, the seeds-assisted space-confined growth of all-inorganic perovskite arrays is reported for ultralow-threshold single-mode lasing. The naturally vapor-phase-grown submicron plates possess high crystal quality, exhibiting an ultralow lasing threshold of approximate to 0.22 mu J cm(-2) among reported perovskite-based lasing. Benefiting from the space-confined effect, the as-grown samples have small lateral size (submicron) leading to the single whispering-gallery mode (WGM) lasing. Importantly, the method can successfully synthesize high-quality CsPbI3 submicron plate arrays and demonstrate single-mode lasing in those submicron plate arrays. The study provides a convenient and effective route to controllably grow all-inorganic submicron plate arrays for ultralow-threshold single-WGM lasing.

Automated summary

All-inorganic lead halide perovskites have excellent optical properties, high emission efficiency, and exciton binding energy, making them promising for optoelectronic applications. However, synthesizing high-quality arrays is challenging. A method using seed-assisted space-confined growth was reported, resulting in high-quality CsPbI3 submicron plate arrays suitable for ultralow-threshold single-mode lasing.