Low-dimensional hybrid organic-inorganic metal halides (OIMHs) have been extensively investigated for their structural tunability and unique optoelectronic properties. However, the synthesis of highly photoluminescent lead-free OIMHs remains challenging. To address...

Zero-dimensional (0D) metal halides have attracted extensive attention due to their excellent optoelectronic properties. Doping is one of the effective strategies to enhance the optical properties of metal halides. Here, we prepared 0D Te4+-doped Rb2ScCl5·H2O single crystals by a facile hydrothermal method. Te4+ doping changes the original Rb2ScCl5·H2O emission band, resulting in a broadband orange emission with a full width at half-maximum of 146 nm. Detailed spectroscopy and fast femtosecond transient absorption measurements indicate that the orange light emission comes from triplet self-trapped excitons. In addition, the fluorescence lifetime of the Rb2ScCl5·H2O:Te4+ single crystal has a strong temperature dependence because Te4+ with the 5s2 electron configuration is more sensitive to temperature. The maximum relative sensitivity (S R ) of 3.53% K–1 for this single crystal occurs at 310 K, and the average absolute sensitivity (S A ) in the sensitive temperature range 240–320 K is 48.06 ns K–1, indicating potential applications in optical thermometry.

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Zero-dimensional (0D) hybrid metal halides have attracted much attention due to their rich composition, excellent optical stability, large exciton binding energy, etc. Photoelectric switchable multifunctional materials can integrate multiple physical...

Two new organic–inorganic hybrid double perovskites (R3HQ)4CsSm(NO3)8 (1) (R3HQ = (R)-(-)-3-quinuclidinol) and (R3HQ)4CsEu(NO3)8 (2) were synthesized and characterized. Compounds 1 and 2 exhibit obvious phase transitions at 379 and 375 K, respectively, confirmed by differential scanning calorimetry (DSC) and variable temperature powder X-ray diffraction. The rapid switching between high- and low-dielectric states makes it a typical dielectric material with a switchable dielectric constant for thermal stimulus response. Furthermore, 1 and 2 show attractive photoluminescence and paramagnetic behavior, and the fluorescence quantum yield of 2 reached 14.6%. These results show that compounds 1 and 2 can be used as excellent candidates for multifunctional intelligent materials, which also provides a new way for development of multifunctional materials.