# Green Synthesis and Flexibilization Engineering of (ECMP)2MnBr4 for Smart Textile‐Integrated Luminescence

## TL;DR

A new green-synthesized material shows excellent light-emitting properties and can be used in smart textiles and X-ray imaging.

## Contribution

The green synthesis of (ECMP)2MnBr4 enables triple-mode emission and integration into wearable applications.

## Key findings

- The material achieves a photoluminescence quantum yield of 98.97%.
- It has a record-low X-ray detection limit of 15.62 nGyair s−1.
- The material is integrated into thermoplastic polyurethane with >1000% strain elasticity.

## Abstract

0D hybrid manganese halides represent an emerging class of luminescent materials, yet their practical application has been hindered by the intrinsic trade‐off between optical performance and mechanical flexibility. Here, a green synthesis of 0D (ECMP)2MnBr4 crystal is reported, exhibiting unprecedented triple‐mode emission (photoluminescence, X‐ray scintillation, and mechanoluminescence) through rationally designed highly symmetric [MnBr4]2− tetrahedra, achieving near‐unity photoluminescence quantum yield (98.97%), record‐low X‐ray detection limit (15.62 nGyair s−1) and multi‐stimuli responsiveness (rubbing, squeezing, stretching). The material's ultralow electron‐phonon coupling (S = 1.438) and defect‐suppressing π–π stacking enable exceptional environmental stability and closed‐loop recyclability via solvent‐mediated recrystallization. Innovatively, (ECMP)2MnBr4 is first integrated into thermoplastic polyurethane via wet‐spinning, simultaneously retaining single‐crystal emission intensity and achieving remarkable elasticity (>1000% strain) for deformation‐resistant wearable applications. This work establishes a new design paradigm for sustainable multifunctional optoelectronics, with immediate applications in wearable displays, high‐resolution X‐ray imaging, and self‐powered optical sensors.

Green‐synthesized (ECMP)2MnBr4 achieves near‐unity photoluminescence quantum yield (98.97%) and triple‐mode emission (photo/X‐ray/mechano), enabling wearable anti‐counterfeiting textiles, ultrasensitive X‐ray imaging (15.62 nGyair s−1), and demonstrating potential for optical stress sensing. Scalable wet‐spun fibers ensure mechanical robustness and ambient processability.