Abstract
Two-dimensional (2D) layered lead halide perovskites with large exciton binding energies, efficient radiative recombination, and outstanding environmental stability are regarded as supreme candidates for realizing highly compact and ultralow threshold lasers. However, continuous-wave (CW) pumped lasing of 2D lead halide perovskites, as the precondition for the electrically pumped lasing, is still challenging. Here, we tackled this challenge by demonstrating lasing emission in phenylethylammonium lead iodide [(PEA)2PbI4] embedded in a vertical microcavity under continuous pumping at room temperature. The millimeter-sized (PEA)2PbI4 single crystal was obtained from a two-step seed-growth method, showing high crystallization, excellent thermal stability, and outstanding optical properties. We used the exfoliated (PEA)2PbI4 thin flake as the gain medium to construct a vertical-cavity surface-emitting laser (VCSEL), showing robust single-mode CW lasing operation with an ultra-low threshold of 5.7 W cm−2 at room temperature, attributed to strong optical confinement in the high-Q cavity. Our findings provide a strategy to design and fabricate solution-based 2D perovskite VCSELs and mark a significant step toward the next-generation of coherent light sources.
Highlights
The amplified spontaneous emission (ASE) and lasing emissions (LEs) of 2D organic–inorganic perovskites have been intensively studied.8–11 For example, Li et al have reported the tunable ASE in hybrid (NMA)2(FA)Pb2BryI7−y thin films.12 Using NMA-based 2D perovskite films as gain media, Leyden et al reported distributed feedback (DFB) lasers and LEDs at room temperature.13 By fabricating micro-ring arrays based on the 2D (BA)2(MA)n−1PbnBr3n+1 perovskite thin film, high Q-factor whispering gallery mode lasers have been realized.14 the lasing was mainly observed from solution-processed thin films, consisting of a mixture of domains having components with different n values, which leads to different bandgaps, and the energy funneling from small n domains to large n domains contributes to the build-up of population inversion
Our findings provide a strategy to design and fabricate solution-based 2D perovskite vertical-cavity surface-emitting laser (VCSEL) and mark a significant step toward the next-generation of coherent light sources
The lasing was mainly observed from solution-processed thin films, consisting of a mixture of domains having components with different n values, which leads to different bandgaps, and the energy funneling from small n domains to large n domains contributes to the build-up of population inversion
Summary
The amplified spontaneous emission (ASE) and lasing emissions (LEs) of 2D organic–inorganic perovskites have been intensively studied.8–11 For example, Li et al have reported the tunable ASE in hybrid (NMA)2(FA)Pb2BryI7−y thin films.12 Using NMA-based 2D perovskite films as gain media, Leyden et al reported distributed feedback (DFB) lasers and LEDs at room temperature.13 By fabricating micro-ring arrays based on the 2D (BA)2(MA)n−1PbnBr3n+1 perovskite thin film, high Q-factor whispering gallery mode lasers have been realized.14 the lasing was mainly observed from solution-processed thin films, consisting of a mixture of domains having components with different n values, which leads to different bandgaps, and the energy funneling from small n domains (high bandgaps) to large n domains (low bandgaps) contributes to the build-up of population inversion.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
