Zhihong Jing

Zero-dimensional (0D) organic–inorganic metal halides (OIMHs) have recently emerged as a highly promising platform for advanced photonic applications owing to their structural tunability and exceptional luminescence properties, particularly in the field of room-temperature phosphorescence (RTP). In this study, we report successful syntheses of three new 0D indium-based OIMHs, namely, [2-AMP]₂InCl₆·Cl, [3-APD]₃InCl₆·Cl₃, and [4-APD]₂InCl₆·Cl via a facile low-temperature solvothermal method. By rationally incorporating inorganic metal halide units into organic matrices, a moderate spin–orbit coupling (SOC) effect is achieved to evidently promote intersystem crossing and suppress nonradiative recombination. Under UV excitation, the resulting single crystals exhibit intense blue fluorescence with a maximum photoluminescence quantum yield (PLQY) of 43.6% and short nanosecond-scale lifetimes. Remarkably, these materials also display bright and durable green RTP with finely tunable lifetimes across a wide range from 80.7 to 168.66 ms and the highest phosphorescence quantum yield of 5.48%. Comprehensive photophysical investigations reveal that the introduction of inorganic skeletons promotes the generation of triplet state electrons, which is crucial for stabilizing the RTP phenomenon. Leveraging the distinct dual-emission colors and varied phosphorescence lifetimes, we designed advanced anticounterfeiting tags and multilevel information encryption technologies. This work not only establishes new efficient In-based RTP materials but also advances the RTP materials toward next-generation optical security applications.

A rapid synthesis strategy was developed to enhance the optical properties of 0D Zn halide with temperature-dependent dual emission through Cu ⁺ doping, which endows the halides with multi-function applications.

Two novel zero-dimensional cadmium halide compounds comprising isolated [CdBr ₄ ] ²⁻ units, which exhibit efficient blue emission through strong phonon coupling and self-trapped excitons.

Zero-dimensional (0D) metal halide-based room-temperature phosphorescence (RTP) materials have received extensive attention with wide application prospects, but they still suffer from low phosphorescence efficiency, which restricts their progress in cutting-edge photonic applications. In this work, a new zero-dimensional (0D) cadmium halide [BTPP]₂CdBr₄ (BTPP = benzyl triphenylphosphonium bromide) was successfully synthesized through a room-temperature solution method. Under excitations of 357 nm and 309 nm UV light, [BTPP]₂CdBr₄ displays dual blue fluorescence and green phosphorescence with lifetimes of 1.38 ns and 76.18 ms, respectively. The quantum yield of phosphorescence reaches 43.68%, which exceeds that of most 0D metal halide-based RTP materials. Detailed experimental characterizations and theoretical calculations demonstrate that the fluorescence and phosphorescence originate from the radiative recombination of singlet self-trapped excitons (STEs) and triplet π–π* charge transfer in the [BTPP]⁺ cation, respectively. Benefitting from its dual luminescence, [BTPP]₂CdBr₄ can be explored as a dual space- and time-resolved luminescent label with applications in anti-counterfeiting and information security, among other fields. This work provides a fundamental structural engineering strategy to design highly efficient 0D metal halide-based RTP materials.

A new zero-dimensional (0D) cadmium halide (BAPPz)Cd₂Br₈·2H₂O with an optically active center emits broadband yellow-white light and shows potential as a new phosphor for high-CRI and energy-efficient white-light-emitting diodes.

Recently, the optical application of coordination polymers (CPs) has received increasing attention. In this paper, two novel Pb(II)-CPs were successfully synthesized under solvothermal conditions. Single-crystal diffraction analysis shows that compound 1 is an orthorhombic crystal system in the Pbca space group, and compound 2 is a monoclinic crystal system in the C2/c space group. Furthermore, we characterized compounds 1 and 2 by powder X-ray diffraction, infrared spectroscopy, solid-state UV-visible absorption spectroscopy and elemental analyses. The optical properties of compounds 1 and 2 were studied in depth, with compound 1 exhibiting yellow luminescence and compound 2 exhibiting blue luminescence. In addition, we mixed compound 1 with a commercial blue phosphor to obtain a white light-emitting diode (WLED) with adjustable correlated color temperature (CCT) and color rendering index (CRI). Therefore, the results suggest that Pb(II)-CPs have potential applications in the WLED field.

This work describes two Ni(ii)/Zn(ii)-CPs with 3D (4,5)-connected net for 1 and pcu net for 2, both can serve as multiresponsive luminescent sensors of IO₄⁻, 2,6-dichloro-4-nitrophenol and folic acid.

[ N -EPD] ₂ ZnBr ₄ produces strong yellow broadband luminescence with a promising quantum yield of 8.28%. This is the first report about yellow light emission in 0D hybrid zinc halides.