Back to Search
Start Over
Pressure‐Suppressed Carrier Trapping Leads to Enhanced Emission in Two‐Dimensional Perovskite (HA)2(GA)Pb2I7.
- Source :
-
Angewandte Chemie . 9/28/2020, Vol. 132 Issue 40, p17686-17692. 7p. - Publication Year :
- 2020
-
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)Pb2I7 (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)Pb2I7. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BAND gaps
*PEROVSKITE
*TRAPPING
*GALLIUM alloys
Subjects
Details
- Language :
- English
- ISSN :
- 00448249
- Volume :
- 132
- Issue :
- 40
- Database :
- Academic Search Index
- Journal :
- Angewandte Chemie
- Publication Type :
- Academic Journal
- Accession number :
- 145990125
- Full Text :
- https://doi.org/10.1002/ange.202001635