Highly Emissive Chiral Mn(II) Bromide Hybrids for UV-Pumped Circularly Polarized LEDs and Scintillator Image Applications

Organic-inorganic hybrid metal halides are a promising platform for the design of materials for circularly polarized luminescence (CPL) and X-ray detection applications. Meanwhile, despite the recent progress in this hot field, hybrid metal halides, simultaneously endowed with efficient CPL and high photoluminescence quantum yield (PLQY), are still limited to a few examples. Herein, the efficient, stable, and low-cost CPL-active Mn(II) hybrids are developed via blending of luminogenic [MnBr4](2-) anions with N/O-H-bond free R/S-[MBA-Me-3](+) cations in a single ionic structure. The synthesized R/S-[MBA-Me-3]MnBr4 hybrids display brightly green Mn2+-centered circularly polarized phosphorescence with near-unity PLQY and a high g(lum) factor of 0.0045. Single crystals of R/S-[MBA-Me-3]MnBr4 are used to fabricate UV-pumped circularly polarized light-emitting diodes (LEDs) displaying a high optical selectivity upon exposure to right-handed and left-handed circular polarization conditions. Moreover, the titled compounds are found to emit strong X-ray radioluminescence with excellent linear response to X-ray dose rate that is used for X-ray imaging demonstration. These findings reveal a great potential of R/S-[MBA-Me-3]MnBr4 as low-cost materials for CPL-LEDs, scintillators, and X-ray imaging applications.

Automated summary

Efficient, stable, and low-cost Mn(II) hybrids that exhibit brightly green Mn2+-centered circularly polarized phosphorescence with near-unity PLQY and a high g(lum) factor have been synthesized. These hybrids can be used for UV-pumped circularly polarized light-emitting diodes (LEDs) and X-ray imaging applications, demonstrating their potential as low-cost materials for CPL-LEDs, scintillators, and X-ray imaging.