Structure and Photoluminescence Transformation in Hybrid Manganese(II) Chlorides

Hybrid metal halides with tunable photoluminescence (PL) properties have emerged as a novel light-emitting material. Hybrid manganese halides are especially attractive due to the eco-friendly and highly emissive advantages. However, the PL tunability induced by structural modulation in manganese halides has rarely been investigated. Herein, a new one-dimensional (1D) hybrid manganese chloride, (4AMP)(4)ClMn3Cl13 center dot HCl (4AMP = 4-(aminomethyl)pyridinium), where the corner-sharing octahedral manganese chloride chains of [Mn3Cl137-](infinity) are surrounded by organic cations, has been prepared. The addition of Zn2+ ions into precursor solution results in the formation of zero-dimensional (0D) single crystals of (4AMP)-Zn1-xMnxCl4 center dot H2O (x = 0-1) with isolated [Zn1-xMnxCl42-] tetrahedral geometry. This structural transformation leads to the PL conversion from red to green emission with an increase of photoluminescence quantum yield (PLQY) from 4.9% to 12.7%. Moreover, the incorporation of other transition metal ions (e.g., Zn2+, Co2+, and Cu2+) reveals the concentration-dependent structure modulation, where the 1D to 0D structure transformations are achieved upon the introduction of these transition metal ions at high concentrations. This work provides a new strategy to modulate the structure and luminescence in manganese halides with tunable PL properties, which could be expanded to other hybrid metal halides.

Automated summary

The research investigates the impact of structural modulation on the photoluminescence properties of hybrid manganese halides. The addition of Zn2+ ions leads to a color conversion and an increase in photoluminescence quantum yield. The findings suggest a new strategy to modulate the structure and luminescence in manganese halides with tunable PL properties, which could be extended to other hybrid metal halides.