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Pressure‐Suppressed Carrier Trapping Leads to Enhanced Emission in Two‐Dimensional Perovskite (HA) 2 (GA)Pb 2 I 7
Author(s) -
Guo Songhao,
Zhao Yongsheng,
Bu Kejun,
Fu Yongping,
Luo Hui,
Chen Mengting,
Hautzinger Matthew P.,
Wang Yingqi,
Jin Song,
Yang Wenge,
Lü Xujie
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202001635
Subject(s) - trapping , perovskite (structure) , amorphous solid , materials science , luminescence , photoluminescence , band gap , orange (colour) , analytical chemistry (journal) , ambient pressure , chemistry , crystallography , optoelectronics , physics , food science , chromatography , biology , thermodynamics , ecology
A remarkable PL enhancement by 12 fold is achieved using pressure to modulate the structure of a recently developed 2D perovskite (HA) 2 (GA)Pb 2 I 7 (HA= n ‐hexylammonium, GA=guanidinium). This structure features a previously unattainable, extremely large cage. In situ structural, spectroscopic, and theoretical analyses reveal that lattice compression under a mild pressure within 1.6 GPa considerably suppresses the carrier trapping, leading to significantly enhanced emission. Further pressurization induces a non‐luminescent amorphous yellow phase, which is retained and exhibits a continuously increasing band gap during decompression. When the pressure is released to 1.5 GPa, emission can be triggered by above‐band gap laser irradiation, accompanied by a color change from yellow to orange. The obtained orange phase could be retained at ambient conditions and exhibits two‐fold higher PL emission compared with the pristine (HA) 2 (GA)Pb 2 I 7 .