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Enhanced Magneto-Photoluminescence in Rubrene Polycrystalline Films via Triplet-Pair Population Control for Magnetic Field Imaging
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J
张
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DOI：10.1002/lpor.202502156.png)
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Abstract
En 中文
Magneto-photoluminescence (MPL) in organic materials offers a promising platform for flexible, low-cost magnetic sensing and photonic spintronic technologies. However, strong magnetic responsiveness in films remains elusive due to inefficient spin interconversion in disordered morphologies. Here, we report a crystallization-driven strategy to boost MPL in rubrene thin films. Thermal annealing induces the formation of polycrystalline structures with enhanced molecular order, yielding a record-high MPL contrast of 40% between ±500 mT—an order of magnitude greater than amorphous counterparts. Spectroscopic studies reveal that improved molecular packing promotes the generation and lifetime extension of spin-correlated triplet-triplet (TT) pairs, enabling efficient singlet fission (SF) and triplet fusion (TF) under magnetic modulation. Temperature-dependent investigations confirm the thermally activated nature of SF and the central role of TT pairs in MPL generation. These polycrystalline films enable magnetic field detection down to 2 µT with sub-microsecond response and high spatial resolution, providing a compelling platform for scalable magneto-optical applications in sensing and spin-based photonics.
Keywords:
crystallization of film
luminescence
magneto-photoluminescence
thin films
triplet-triplet pairs
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