Long-distance and flexible optical fiber scintillators are essential under extreme operating conditions including interventional radiology and remote nuclear reactor monitoring, etc. Organic–inorganic hybrid glass fibers offer a promising solution, yet transforming cluster glasses into stable photonic architectures remains challenging. Here we report a heteroleptic strategy that exploits steric hindrance effects to precisely modulate the thermodynamic properties of hybrid Cu 4 I 4 cluster glass, further enabling ultralong, fracture-free, and perturbation-free TPP 2 MDP 2 Cu 4 I 4 (TPP = Triphenylphosphine; MDP = Methyldiphenylphosphine) glass fibers. The heteroleptic TPP 2 MDP 2 Cu 4 I 4 core glass not only overcomes the stability limitations of hybrid systems, but also exhibits a notable light yield of 38598 photons MeV −1 and a low detection limit of 62.2 nGy s −1 . We assemble these fibers into a flexible scintillation fiber array capable of imaging internal defects in confined spaces. This heteroleptic design principle in cluster glass platform can be extended to other hybrid glass fibers for emerging photonic applications.
Highly transparent and large-area scintillator film is highly desirable for next-generation X-ray imaging and detection. Herein, we develop a rapid and in situ synthesis strategy to fabricate polymer scintillator film composed of (C 14 H 15 P) 4 Cu 4 I 4 glassy cluster gel (M1-GCG). The large-area M1-GCG film of 20 × 12 cm was obtained by in situ UV photopolymerization within 30 s, showing ∼90% transmittance in the broad spectral region of 400–1,000 nm, in which Cu(I) iodide clusters coordinated by phosphine ligands are generated as a glassy form in the polymer network structure and uniformly distributed under supramolecular interactions, as the polymer monomer is polymerized and cross-linked under ultraviolet light. We develop a brand-new chemical synthesis route toward polymer-based composite scintillator film, and the M1-GCG film with high transparency and scintillation properties, as well as high-resolution X-ray imaging ability, shows extraordinary potential for large-area medical imaging and industrial non-destructive detection.
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