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Multifunctional additive collaborative strategy for efficient near-infrared tin-based perovskite light-emitting diodes
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DOI：10.1016/j.infrared.2025.106338.png)
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Abstract
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Smaller ionization energy and electronegativity enable the emission range of Eco-friendliness Sn-based perovskite light-emitting diodes (PeLEDs) researched to near-infrared range, which exhibits a wide range of applications in night vision, biomedicine, and communications. Nevertheless, the oxidizability of Sn2+ and the rapid crystallization rate of Sn-based perovskites lead to poor film quality, thus leading to diminished efficiency in tin-based PeLEDs. We developed effective Near-infrared (NIR) PeLEDs based on FA0.875Cs0.125SnI3 by using D-serine benzyl ester hydrochloride (D-SBEHC) as an additive, which has significant steric hindrance and multifunctional groups. The hydrogen bonding and coordination between D-SBEHC and FA0.875Cs0.125SnI3 effectively diminish the crystallization rate of the perovskite, inhibit the oxidation of Sn2+, and prevent the production of defects. The perovskite films modified by D-SBEHC exhibit nearly threefold increase inphotoluminescence quantum yield. Finally, we fabricated an efficient and stable PeLED with a peak at 903 nm, showing an external quantum efficiency (EQE) of 3.99% (eight times that of the control device) and a maximum radiance of 31 W/sr/m2.
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