Volatile ammonium-driven perovskite phase reconstruction for high-performance quasi-CW lasing

Xinyang Wang; Guochao Lu; Qiuting Cai; Jing Li; Haoran Zhang; Zaishang Long; Meiyi Zhu; Yun Gao; Qingli Cao; Hanyan Huang; Xingliang Dai; Zhizhen Ye; Haiping He

doi:10.1117/1.ap.7.5.056006

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Volatile ammonium-driven perovskite phase reconstruction for high-performance quasi-CW lasing

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https://doi.org/10.1117/1.ap.7.5.056006

Volatile ammonium-driven perovskite phase reconstruction for high-performance quasi-CW lasing

Aug 19, 2025
Advanced Photonics
Xinyang Wang +12 more

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Abstract

All-inorganic CsPbBr3 perovskite polycrystalline films, renowned for their remarkable optoelectronic properties, solution processability, and enhanced stability over organic–inorganic counterparts, are emerging as next-generation gain media for high-performance lasers. However, due to the limited understanding of how to realize population inversion under slow carrier injection, and a lack of convenient strategies to suppress Auger recombination while retaining low optical loss, achieving high-performance quasi-continuous-wave (quasi-CW) or CW lasing based on CsPbBr3 films at ambient temperature is still challenging. We devised a phase reconstruction strategy employing volatile ammonium, which achieves substantial suppression of Auger recombination through elimination of low-dimensional phase impurities and remains low optical loss via precisely controlled film crystallization dynamics. Importantly, this strategy emphasizes the critical role of Auger recombination suppression for high-performance lasing under slower carrier injection. Ultimately, an ultralow amplified spontaneous emission threshold of 9.6 μJ cm−2 was achieved under quasi-continuous nanosecond-pulsed excitation, which facilitated the realization of a single-mode vertical-cavity surface-emitting laser with a threshold of 17.3 μJ cm−2 and a quality factor of 3850 under quasi-CW pumping. We represent the exceptional performance of quasi-CW lasing to date, offering valuable insights for future advancements in high-performance CW lasing and even electrically driven lasers.

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46
10.1021/acsami.2c02861

Controlling the Cation Exsolution of Perovskite to Customize Heterostructure Active Site for Oxygen Evolution Reaction.

May 27, 2022
ACS Applied Materials & Interfaces
Yicheng Wei + 7 more +7

Perovskite oxides are an important class of oxygen evolution reaction (OER) catalysts offering an ordered atomic arrangement and a highly flexible electronic structure. Currently, understanding and adjusting the dynamic reconstruction of perovskite during the OER process remains a formidable challenge. Here, we report the artificial construction of a heterostructure by the cation exsolution of perovskite to control the active site formation and reconstruction. The deliberately made La deficiency in LaNiO3 perovskite facilitates the original segregation of NiO from the parent matrix and forms a well-defined interface between perovskite parent and NiO exsolution phase. The dynamic formation process of such heterojunction was studied by density functional theory computation and high quality imaging characterization. Due to the valence redistribution of Ni ions caused by the interfacial electron transfer, the in situ formed LaNiO3/NiO heterostructure displays high electroactivity. Therefore, the LaNiO3/NiO heterostructure exhibits a dynamic surface evolution feature with the generation of the highly active NiOOH layer under a low anodic potential (∼1.35 V vs RHE) during the OER process, which is very different from the conventional LaNiO3 with a stoichiometry and NiO catalysts. With the newly formed heterostructure, the reconstructed catalysts impart a 4.5-fold increase in OER activity and a 3-fold improvement in stability against La and Ni dissolution during the OER process. This work provides a feasible interface engineering strategy for artificially controlling the reconstruction of the active phase in high-performance perovskite-based electrocatalytic materials.