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Photographs demonstrating the mechanoresponsive luminescence behavior of (a) Rot-1-PU, (b) Rot-2-PU, and (c) Rot-3-PU upon uniaxial deformation. The top row in each panel shows images taken under excitation with 365 nm UV light, while the bottom rows show images taken in room light. The applied strain λ = (L – L0)/L0 is shown above the columns of images.
