Phase-pure 2D tin halide perovskite thin flakes for stable lasing

Ruddlesden-Popper tin halide perovskites are a class of two-dimensional (2D) semiconductors with exceptional optoelectronic properties, high carrier mobility, and low toxicity. However, the synthesis of phase-pure 2D tin perovskites is still challenging, and the fundamental understanding of their optoelectronic properties is deficient compared to their lead counterparts. Here, we report the synthesis of a series of 2D tin perovskite bulk crystals with high phase purity via a mixed-solvent strategy. By engineering the quantum-well thickness (related to n value) and organic ligands, the optoelectronic properties, including photoluminescence emission, exciton-phonon coupling strength, and exciton binding energy, exhibit a wide tunability. In addition, these 2D tin perovskites exhibited excellent lasing performance. Both high-n value tin perovskite (n > 1) and n = 1 tin perovskite thin flakes were successfully optically pumped to lase. Furthermore, the lasing from 2D tin perovskites could be maintained up to room temperature. Our findings highlight the tremendous potential of 2D tin perovskites as promising candidates for high-performance lasers.

Automated summary

In this study, a series of high-purity 2D tin perovskite bulk crystals were synthesized via a mixed-solvent strategy, and their optoelectronic properties were tunable by engineering the quantum-well thickness and organic ligands. The 2D tin perovskites exhibited excellent lasing performance, with both high-n value and n = 1 perovskite thin flakes demonstrating lasing effects and maintaining lasing characteristics up to room temperature. These findings highlight the tremendous potential of 2D tin perovskites as promising candidates for high-performance lasers.