A series of new Sb ³⁺ doped-(DETA)InCl ₆ organic–inorganic hybrid metal halide single crystals were synthesized. The PLQY of single crystals doped with 10% Sb was up to 100%, and white light emission was achieved when the Sb doping amount was 0.005%.

The room-temperature phosphorescence quantum efficiency of [BPy] ₆ [Pb ₃ Br ₁₂ ] has been improved by a maximum of fourteen-fold through sensitization of thiadiazole-based molecules.

The preparation of crystalline molecularly supertetrahedral Tn clusters with variable sizes and components is of vital importance for the fundamental study of their physicochemical properties. However, setting up an efficient method to stabilize large discrete Tn clusters is a challenge due to their high negative charges and polymerization nature. In this work, we report on the ionothermal synthesis of three discrete T4 cluster compounds, namely [Bmmim]₅[(CH₃)₂NH₂]₄[NH₄][M₄In₁₆S₃₁(SH)₄]·6H₂O (M = Mn (1), Zn (2), Cd (3), Bmmim = 1-buty-2,3-dimethyl-imidazolium), and four discrete T5 cluster compounds, namely [Bmmim]₁₀[NH₄]₃[Cu₅Ga_30−xIn_xS₅₂(SH)₄] (x = 6.6 (5), 14.5 (6), 23.8 (7), and 30 (8)). The compound [Bmmim]₁₀[NH₄]₃[Cu₅Ga₃₀S₅₂(SH)₄] (4) previously reported by us features a discrete T5 cluster. The steep UV-Vis absorption edges indicate band gaps of 2.20 eV for 1, 2.64 eV for 2, 2.69 eV for 3, 3.04 eV for 4, 2.65 eV for 5, 2.48 eV for 6, 2.32 eV for 7, and 2.30 eV for 8. The compositions of T5 clusters could be varied with the ratios of Ga : In in the starting reagents, providing an opportunity to systematically control the band gaps and fluorescence performances of T5 cluster-based compounds. This research might advance the understanding of the ionothermal preparation and functionality tuning of crystalline chalcogenides.