Pressure‐Suppressed Carrier Trapping Leads to Enhanced Emission in Two‐Dimensional Perovskite (HA) 2 (GA)Pb 2 I 7

Guo, Songhao; Zhao, Yongsheng; Bu, Kejun; Fu, Yongping; Luo, Hui; Chen, Mengting; Hautzinger, Matthew P.; Wang, Yingqi; Jin, Song; Yang, Wenge; Lü, Xujie

doi:10.1002/ange.202001635

Title: Pressure‐Suppressed Carrier Trapping Leads to Enhanced Emission in Two‐Dimensional Perovskite (HA) ₂ (GA)Pb ₂ I ₇

Journal Article · Thu Aug 13 00:00:00 EDT 2020 · Angewandte Chemie

DOI:https://doi.org/10.1002/ange.202001635· OSTI ID:1647419

Guo, Songhao ^[1]; Zhao, Yongsheng ^[1]; Bu, Kejun ^[1]; Fu, Yongping ^[2]; Luo, Hui ^[1]; Chen, Mengting ^[1]; Hautzinger, Matthew P. ^[2]; Wang, Yingqi ^[1]; Jin, Song ^[2]; Yang, Wenge ^[1];

^[1]

Center for High Pressure Science and Technology Advanced Research (HPSTAR) Shanghai 201203 P. R. China
Department of Chemistry University of Wisconsin-Madison Madison WI 53706 USA

Abstract 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 .

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Sponsoring Organization:: USDOE

OSTI ID:: 1647419

Journal Information:: Angewandte Chemie, Journal Name: Angewandte Chemie Vol. 132 Journal Issue: 40; ISSN 0044-8249

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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