Journal
NATURE MATERIALS
Volume 18, Issue 8, Pages 846-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0416-2
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Funding
- European Union through FP7 (ERC starting grant NANOSOLID) [306733]
- Horizon-2020 (Marie-Sklodowska Curie ITN network PHONSI) [H2020-MSCA-ITN-642656]
- Swiss Commission for Technology and Innovation CTI (project SecureFLIM)
- Swiss Nano-Tera programme (project FlusiTex)
- Swiss Nano-Tera programme (project FlusiTex Gateway)
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Although metal-halide perovskites have recently revolutionized research in optoelectronics through a unique combination of performance and synthetic simplicity, their low-dimensional counterparts can further expand the field with hitherto unknown and practically useful optical functionalities. In this context, we present the strong temperature dependence of the photoluminescence lifetime of low-dimensional, perovskite-like tin-halides and apply this property to thermal imaging. The photoluminescence lifetimes are governed by the heat-assisted de-trapping of self-trapped excitons, and their values can be varied over several orders of magnitude by adjusting the temperature (up to 20 ns degrees C-1). Typically, this sensitive range spans up to 100 degrees C, and it is both compound-specific and shown to be compositionally and structurally tunable from -100 to 110 degrees C going from [C(NH2)(3)](2)SnBr4 to Cs4SnBr6 and (C4N2H14I)(4)SnI6. Finally, through the implementation of cost-effective hardware for fluorescence lifetime imaging, based on time-of-flight technology, these thermoluminophores have been used to record thermographic videos with high spatial and thermal resolution.
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