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Gated thermochromism in 2D perovskite (PEA)2PbBr4 via strain-defect pinning of self-trapped excitons
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DOI：10.1016/j.jlumin.2026.122024.png)
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Abstract
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• Lattice relaxability, modulated by microstructural strain and defects, governs self-trapped exciton formation and thermochromism in 2D (PEA)2PbBr4. • Cooperative lattice relaxation, essential for exciton self-trapping, is suppressed in polycrystalline thin films by synergistic strain-defect pinning. • Engineering the strain-defect landscape offers a strategy to gate excitonic pathways and enable stimuli-responsive functionalities in layered perovskites.
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