基于混合DJ-RP配体策略的红光准二维钙钛矿发光二极管性能研究
Study on the Performance of Red Quasi-2D Perovskite Light-Emitting Diode Based on a Mixed DJ-RP Ligand Strategy
DOI: 10.12677/ms.2026.165095, PDF,    科研立项经费支持
作者: 李伯洋, 邱浪文, 邓智友：五邑大学应用物理与材料学院，广东 江门
关键词: 准二维钙钛矿；混合配体；相分布调控；缺陷钝化；Quasi-2D Perovskite； Mixed Ligand； Phase Distribution Regulation； Defect Passivation
摘要: 准二维钙钛矿发光二极管(PeLED)因其带隙可调、色纯度高和可溶液加工等优势，在发光领域展现出巨大潜力。其中，红光器件是全彩显示和固态照明的关键组成部分，其性能提升对推动PeLEDs实际应用具有重要意义，但目前红光准二维PeLED仍面临相分布控制难和缺陷态密度高的双重挑战。本文提出一种脂肪型Dion-Jacobson (DJ)-Ruddlesden-Popper (RP)混合配体策略，利用1,5-戊二胺氢碘酸盐(PDAI2)与丙胺氢碘酸盐(PAI)在无机层间等效长度上的结构兼容性，对钙钛矿薄膜的相分布与缺陷态进行协同调控。其中，单个PDAI2有机间隔层配体在无机层间占据的间隔长度，与两个PAI配体形成的等效间隔长度相近，为二者在结晶过程中形成构型匹配的混合间隔层、避免因长度失配导致的结构扭曲或相分离，从而实现协同钝化提供了结构基础。实验结果证明，混合配体薄膜的PLQY由30.8%提升至71%。基于该策略的准二维PeLED实现了691 nm处的稳定红光发射，最大外量子效率为13.49%，器件T50寿命提升13倍。该工作为红光准二维钙钛矿光电器件的进一步发展提供了有效策略。
Abstract: Quasi-two-dimensional perovskite light-emitting diodes (PeLEDs) have attracted extensive attention in the field of light emission owing to their tunable bandgap, high color purity, and solution processability. Among them, red emitters are a crucial component for full‑color displays and solid‑state lighting, and their performance improvement is of great significance for promoting the practical application of PeLEDs. However, red quasi‑2D PeLEDs currently face the dual challenges of difficult phase distribution control and high defect density. Herein, we propose a mixed aliphatic DJ-RP ligand strategy, leveraging the structural compatibility in equivalent length between inorganic layers between 1,5‑pentanediamine hydroiodide (PDAI₂) and propylamine hydroiodide (PAI) to jointly regulate the phase distribution and defect density of the perovskite film. Specifically, the spacer length occupied by a single PDAI₂ molecule between inorganic layers closely matches the effective spacer length formed by two PAI molecules arranged in a head‑to‑head manner, providing a structural basis for the formation of a configurationally matched mixed interlayer during crystallization, thereby avoiding structural distortion or phase separation caused by length mismatch and achieving synergistic passivation. Experimentally, the mixed‑ligand film exhibits a substantially enhanced photoluminescence quantum yield (PLQY) from 30.8% to 71. %. The red quasi‑2D PeLEDs based on this strategy achieve stable emission at 691  nm with a maximum external quantum efficiency (EQE) of 13.49%, and an extended operational lifetime (T₅₀) by 13 times. This work provides an effective strategy for the further development of red quasi‑two‑dimensional perovskite optoelectronic devices.
文章引用：李伯洋, 邱浪文, 邓智友. 基于混合DJ-RP配体策略的红光准二维钙钛矿发光二极管性能研究[J]. 材料科学, 2026, 16(5): 12-23. https://doi.org/10.12677/ms.2026.165095

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