Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.068
Publication date: 18th July 2019
Three-dimensional (3D) lead-halide perovskites continue to receive tremendous amounts of attention owing to their unique, and apparently, defect-tolerant photophysical and charge-transport properties. The discovery and subsequent investigation of these characteristics has spurred the innovative use of these materials in numerous applications such as solar cells, photodetectors, and hard-radiation detectors. While these fields continue to benefit from the use of lead-halide perovskites, the search for lead-free alternatives has so far achieved limited success. Newly discovered, ternary, metal-halide based materials seldom adhere to a cubic, 3D perovskite structure, but rather tend to adopt lower-dimensional structures with reduced connectivity between polyhedra and altered characteristics. In the case of zero-dimensional (0D), fully disconnected, materials, a unique set of properties are observed.
One recent entry to the growing list of luminescent 0D materials is the fully-inorganic, perovskite-derived, Cs4SnBr6, which exhibits room-temperature, broad-band photoluminescence (PL) centered at 540 nm with a quantum yield (QY) of 15±5% (Fig. 1a). Additionally, a compositional series Cs4-xAxSn(Br1-yIy)6 (A = Rb, K; x ≤ 1, y ≤ 1) can be prepared with PL that is tunable from 500-620 nm and a compositionally tunable Stokes shifts (Fig. 1b).[1] Furthermore, these materials and other low-dimensional tin-halides such as (C4N2H14I)4SnI6 and [C(NH2)3]2SnBr4 all share an additional property – highly temperature-sensitive PL lifetimes (Fig. 1c).[2] Not only are these lifetimes invariant on excitation power density, encapsulation, oxidation, spectral position, or other potential defects, they are highly reproducible with a variation of ca. 40 picoseconds over the course of 50 consecutive measurements. With these highly reproducible and thermally ultra-sensitive lifetimes, cutting-edge remote optical thermography can be achieved with a thermometric precision of up to 13 mK (Fig. 1d).
We would like to acknowledge financial support from the European Union through FP7 (ERC starting grant NANOSOLID, GA no. 306733) and Horizon‐2020 (Marie‐Skłodowska Curie ITN network PHONSI, H2020‐MSCA‐ITN‐642656). Additinoally, we would like to thank the Swiss Nano-Tera programme (projects FlusiTex and FlusiTex Gateway) and the Swiss Commission for Technology and Innovation CTI (project SecureFLIM) for financing the development of the ToF-FLI imager.
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