Low-threshold FAPbBr3 lasers based on a dual-additive strategy

Jingya Lai; Xinyu Huang; Yujing Wang; Chengcheng Wang; Jinfeng Yu; Runqin Lu; Zhiyuan Kuang; Kang Tian; Chao Ma; Wei Huang; Jianpu Wang; Qiming Peng

doi:10.1002/flm2.70037

FlexMat ›› 2026, Vol. 3 ›› Issue (1) :71 -77. DOI: 10.1002/flm2.70037

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Low-threshold FAPbBr₃ lasers based on a dual-additive strategy

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Abstract

Achieving low-threshold lasing in formamidinium (FA)-based perovskite films remains challenging due to difficulties in controlling their crystallization. In this study, we introduce a dual-additive strategy utilizing zinc acetate (Zn(Ac)₂) and 5-aminovaleric acid (5-AVA) to modulate the crystallization process of FA-based perovskite films. The synergistic effect of these additives enables the formation of smooth and dense FAPbBr₃ films with a low surface roughness of 1.36 nm and a high photoluminescence quantum efficiency (PLQE) of 63.6%. Based on these high-quality films, we demonstrate amplified spontaneous emission with a threshold as low as 26 μJ/cm². Moreover, by integrating the perovskite films with distributed feedback gratings, we achieve perovskite lasing with a record-low threshold of 15.5 μJ/cm² under nanosecond-pulsed optical excitation at room temperature. This work offers valuable insights into the fabrication of high-quality FA-based perovskite films and represents a significant step toward the development of high-performance perovskite laser devices.

Keywords

DFB / dual-additive / lasing / perovskites

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Jingya Lai, Xinyu Huang, Yujing Wang, Chengcheng Wang, Jinfeng Yu, Runqin Lu, Zhiyuan Kuang, Kang Tian, Chao Ma, Wei Huang, Jianpu Wang, Qiming Peng. Low-threshold FAPbBr₃ lasers based on a dual-additive strategy. FlexMat, 2026, 3 (1) : 71-77 DOI:10.1002/flm2.70037

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