Melt‐Processable Manganese (II)‐Based Hybrid Luminescent Glass Enables Lifetime‐Based Thermal Imaging

ABSTRACT Fluorescence lifetime (FL)‐based thermal imaging can be applied on geometrically complex curved surfaces, which necessitates the development of conformable and thermosensitive luminescent materials. However, FL‐type optical thermometry relies predominantly on crystalline rare earth phosphors, which are difficult to scale from point sensing to complex surface measurements. In this study, we report a melt‐processable manganese (II)‐based hybrid glass that simultaneously delivers conformability and high thermal sensitivity by deliberately amplifying non‐radiative relaxation pathways. Specifically, melt‐quenching (5CTP) 2 MnBr 4 (5CTP = 5‐carboxypentyltriphenylphosphonium) transforms the highly symmetric crystalline solids into a disordered glassy network, introducing dense trap states and strong electron‐phonon coupling, which together mediate thermally activated non‐radiative decay and dramatically amplify the thermal sensitivity of the Mn 2+ FL compared to its crystalline counterpart. Leveraging the low‐temperature processability of the glass, we apply it as a conformal coating onto curved surfaces and demonstrate full‐field remote thermal imaging by coupling pulsed laser excitation with a high‐speed camera to extract pixel‐wise FLs. This work establishes a new paradigm for highly sensitive, conformable hybrid halide luminescent glasses for advanced thermal diagnostics.