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Meniscus-Guided Molecular Alignment for High-Efficiency Solution-Processed DR/NIR-OLEDs
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DOI：10.1002/adom.202501346.png)
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Abstract
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Low-cost, solution-processed organic light-emitting diodes (OLEDs) have garnered significant attention for large-area and flexible wearable applications. However, the solution-based fabrication process often results in disordered molecular packing and random dipole orientation, leading to inferior electroluminescence efficiency compared to vacuum-deposited devices. Here, a high-efficiency deep-red/near-infrared OLED is demonstrated achieved through meniscus-guided coating technology, which enables precise control over emitter alignment in the emissive layer. This off-center spin-coating technique promotes tighter π–π stacking and lamellar packing along the radial shear direction, yielding a dramatically enhanced horizontal dipole ratio (73% vs 54% in conventional on-center spin-coated films), a 2.5-fold increase in photoluminescence quantum yield, and improved charge transport balance. As a result, the optimized device achieves a record external quantum efficiency (EQE) of 17.6% in the 600–800 nm range—a 2.4-fold enhancement over the on-center spin-coated counterpart with an EQE of 7.4%. This approach provides a generalizable strategy for controlling molecular orientation in solution-processed optoelectronics without additional post-treatment steps.
Keywords:
dipole orientation
meniscus-guided coating technology
molecular packing
solution-processed organic light-emitting diodes
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