Lasing in laminar PbI₂single crystals

Low Threshold Fabry–Pérot Mode Lasing from Lead Iodide Trapezoidal Nanoplatelets

“…Nevertheless, the characteristic temperature of as‐grown trapezoidal NPs is larger than that of hexagonal PbI 2 NP (45 K), which coincides with the lower threshold in the trapezoidal NPs . Overall, as shown in Table S2 of the Supporting Information, the lasing threshold of the trapezoidal NPs at 120 K (44.5 µJ cm −2 ) is nearly two orders lower than the values in PbI 2 microlasers operated at 77 K (200 µJ cm −2 ) reported previously, strongly suggesting the high quality of the as‐grown PbI 2 trapezoidal FP microcavities …”

Whispering Gallery Mode Lasing from Hexagonal Shaped Layered Lead Iodide Crystals

“…Despite the limited work on linear optical properties, the studies that focus on the recombination and amplification of photon emission in layered PbI 2 platelets under strong optical excitation are still limited. 23,24 In this work, we have synthesized regular-shaped PbI 2 platelet with thickness ranging from 10À500 nm using a chemical vapor deposition (CVD) method. The as-prepared single crystalline platelets exhibit a near band gap emission of ∼500 nm at 77 K. Whispering gallery mode (WGM) lasing from PbI 2 is demonstrated from individual platelets at temperatures from 77À210 K. Lasing modes are supported in PbI 2 platelets as thin as 45 nm, which is the thinnest planar laser ever reported.…”

“…g ., lead iodide) are important toward the understanding of the photophysics of the inorganic–organic perovskites and their applications in emergent devices. , From previous literature, the optical and excitonic properties of single crystalline PbI 2 films and thin layers have been previously investigated by steady-state and ultrafast spectroscopy techniques. ,− As for their synthesis, several special experimental methods have been developed involving the sol–gel method, vapor deposition method, and Bridgman’s method for growth of PbI 2 single crystals. , However, challenges pertaining to the synthesis of regular-shaped single crystalline PbI 2 crystals with subwavelength thickness, ideal for on-chip optical amplifier and lasers integration with planar optoelectronic devices, remain daunting. Despite the limited work on linear optical properties, the studies that focus on the recombination and amplification of photon emission in layered PbI 2 platelets under strong optical excitation are still limited. , …”