Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 58, Issue 43, Pages 15249-15253Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201906311
Keywords
band gap narrowing; halide double perovskite; pressure-induced emission; self-trapped excitons
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Funding
- National Natural Science Foundation of China (NSFC) [21725304, 11774120, 21673100]
- Chang Jiang Scholars Program of China [T2016051]
- Fundamental Research Funds for the Central Universities
- US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
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Two-dimensional (2D) halide perovskites have attracted significant attention due to their compositional flexibility and electronic diversity. Understanding the structure-property relationships in 2D double perovskites is essential for their development for optoelectronic applications. In this work, we observed the emergence of pressure-induced emission (PIE) at 2.5 GPa with a broad emission band and large Stokes shift from initially nonfluorescent (BA)(4)AgBiBr8 (BA=CH3(CH2)(3)NH3+). The emission intensity increased significantly upon further compression up to 8.2 GPa. Moreover, the band gap narrowed from the starting 2.61 eV to 2.19 eV at 25.0 GPa accompanied by a color change from light yellow to dark yellow. Analysis of combined in situ high-pressure photoluminescence, absorption, and angle-dispersive X-ray diffraction data indicates that the observed PIE can be attributed to the emission from self-trapped excitons. This coincides with [AgBr6](5-) and [BiBr6](3-) inter-octahedral tilting which cause a structural phase transition. High-pressure study on (BA)(4)AgBiBr8 sheds light on the relationship between the structure and optical properties that may improve the material's potential applications in the fields of pressure sensing, information storage and trademark security.
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