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

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. 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) 2 MnBr 4 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 nGy air s −1 ), and demonstrating potential for optical stress sensing. Scalable wet-spun fibers ensure mechanical robustness and ambient processability. 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) 2 MnBr 4 crystal is reported, exhibiting unprecedented triple-mode emission (photoluminescence, X-ray scintillation, and mechanoluminescence) through rationally designed highly symmetric [MnBr 4 ] 2− tetrahedra, achieving near-unity photoluminescence quantum yield (98.97%), record-low X-ray detection limit (15.62 nGy air 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) 2 MnBr 4 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. Advanced Science, Volume 12, Issue 42, November 13, 2025.