Waterproof perovskite-hexagonal boron nitride hybrid nanolasers with low lasing thresholds and high operating temperature

Solid-state perovskites have recently emerged as promising coherent light sources. Realization of an electrical perovskite-based laser diode still remains challenging due to the heat management and intrinsic instability of the perovskites. Here, we demonstrate waterproof perovskite-hexagonal boron nitride (hBN) hybrid nanolasers with low lasing thresholds and high operating temperature. After capping with the hBN flake which possesses superb and anisotropic thermal conductivity, heat dissipation of the hybrid nanolaser is accelerated, resulting in the significant reduction of lasing thresholds, and clear lasing behavior under a temperature as high as 75.6 °C. Moreover, hBN with high environmental stability can effectively protect the perovskite from the polar solvents. The hBN encapsulated CsPbI₃ nanolasers can incessantly lase in water for an hour, and the lasing behavior can be retained even after 24-hour immersion in water. The reduction of lasing threshold, improved heat removal, and higher temperature tolerance of the hybrid nanolaser marks a major step towards CW-pumped perovskite laser at room temperature, while also allowing perovskites to be integrated into high power density optoelectronic devices and future electrically driven lasers.