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<p>Metal-halide perovskites possess excellent optical gain, narrow emission linewidths, and high emission efficiency, rendering them highly promising for next-generation laser applications. Thermal evaporation, a mature semiconductor fabrication technique, offers a viable route toward scalable production. However, monitoring the phase distribution of perovskites in the thermally evaporated process is still challenging. Here, we systematically investigated and regulated thermally evaporated FA<sub><i>x</i></sub>Cs<sub>0.8</sub>PbBr<sub>3</sub> perovskite films by tuning the formamidinium (FA) content to optimize the phase distribution. At an intermediate FA content, the film exhibited a more balanced distribution of <i>n</i> = 2 to <i>n</i> = 5 quantum-well phases, which facilitated ultrafast carrier transfer (&lt;0.31 ps) and suppressed nonradiative recombination. FA<sup>+</sup> actively participates in the perovskite lattice as an A-site cation, contributing to more ordered crystallization and lower defect densities. The optimized film achieved a net modal gain of 1041 cm<sup>−1</sup> and a gain lifetime as long as 129 ps. Furthermore, benefiting from the efficient internal scattering, the threshold for cavity-free random lasing is successfully reduced to below 5 µJ/cm<sup>2</sup> at room temperature. The low spatial coherence of the random lasing enabled speckle-free imaging with a speckle contrast as low as 0.011 and improved contrast-to-noise ratios across all spatial frequencies. This work provides a scalable strategy for perovskite composition-phase engineering, paving the way toward speckle-free laser imaging systems compatible with semiconductor-grade, large-area manufacturing techniques.</p>

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Phase distribution control in thermally evaporated perovskite films for speckle-free laser imaging

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Xingrong Jiang,
  • Jianfeng Ou,
  • Jingjing Yang,
  • Sihao Huang,
  • Zhengzheng Liu,
  • Qian Li,
  • Hao Wang,
  • Siyu Dong,
  • Chang Liu,
  • Baihui Nie,
  • Zhiping Hu,
  • Zeyu Zhang,
  • Jiajun Luo,
  • Yuxin Leng,
  • Juan Du

摘要

Metal-halide perovskites possess excellent optical gain, narrow emission linewidths, and high emission efficiency, rendering them highly promising for next-generation laser applications. Thermal evaporation, a mature semiconductor fabrication technique, offers a viable route toward scalable production. However, monitoring the phase distribution of perovskites in the thermally evaporated process is still challenging. Here, we systematically investigated and regulated thermally evaporated FAxCs0.8PbBr3 perovskite films by tuning the formamidinium (FA) content to optimize the phase distribution. At an intermediate FA content, the film exhibited a more balanced distribution of n = 2 to n = 5 quantum-well phases, which facilitated ultrafast carrier transfer (<0.31 ps) and suppressed nonradiative recombination. FA+ actively participates in the perovskite lattice as an A-site cation, contributing to more ordered crystallization and lower defect densities. The optimized film achieved a net modal gain of 1041 cm−1 and a gain lifetime as long as 129 ps. Furthermore, benefiting from the efficient internal scattering, the threshold for cavity-free random lasing is successfully reduced to below 5 µJ/cm2 at room temperature. The low spatial coherence of the random lasing enabled speckle-free imaging with a speckle contrast as low as 0.011 and improved contrast-to-noise ratios across all spatial frequencies. This work provides a scalable strategy for perovskite composition-phase engineering, paving the way toward speckle-free laser imaging systems compatible with semiconductor-grade, large-area manufacturing techniques.