Direct Observation of Competition between Amplified Spontaneous Emission and Auger Recombination in Quasi-Two-Dimensional Perovskites

Minghuan Cui; Chaochao Qin; Yuanzhi Jiang; Mingjian Yuan; Liuhong Xu; Didi Song; Yuhai Jiang; Yufang Liu

doi:10.1021/acs.jpclett.0c01852

Direct Observation of Competition between Amplified Spontaneous Emission and Auger Recombination in Quasi-Two-Dimensional Perovskites

J Phys Chem Lett. 2020 Jul 16;11(14):5734-5740. doi: 10.1021/acs.jpclett.0c01852. Epub 2020 Jul 6.

Authors

Minghuan Cui¹, Chaochao Qin¹, Yuanzhi Jiang², Mingjian Yuan², Liuhong Xu¹, Didi Song¹, Yuhai Jiang³, Yufang Liu¹

Affiliations

¹ Henan Key Laboratory of Infrared Materials & Spectrum Measures and Applications, Henan Normal University, Xinxiang 453007, P. R. China.
² Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, P. R. China.
³ Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, P. R. China.

PMID: 32598158
DOI: 10.1021/acs.jpclett.0c01852

Abstract

Quasi-two-dimensional (quasi-2D) Ruddlesden-Popper perovskites (RPPs) have been reported recently as laser media. The carrier dynamics of lasing in quasi-2D RPP films is still controversial. This work presents the amplified spontaneous emission (ASE) at room temperature based on the solution-processed quasi-2D (PEA)₂Cs_n-1Pb_nBr_3n+1 (⟨n⟩ = 3-5) thin films. Transient absorption spectroscopy was conducted to demonstrate the accumulation of excitons and population inversion for ASE caused by the energy transfer process along cascade quantum wells. The competition between the ASE and Auger recombination processes was observed via systematic and quantitative studies on the carrier dynamics. It is found that the contribution of Auger recombination is reduced by decreasing the temperature or adjusting the domain distribution of the quasi-2D RPP films, in order to achieve lower thresholds. This work re-emphasizes the importance of Auger recombination control for achieving low-threshold electrically or continuous-wave driven lasers and deepens the fundamental understanding of charge carrier dynamics of lasing in quasi-2D perovskite films.