近日，美国罗格斯大学李静团队研究了双界面氢键增强的深蓝色杂化碘化铜LED。2025年7月16日出版的《自然》杂志发表了这项成果。

基于无毒的碘化铜杂化物的溶液处理发光二极管由于其可调性、高光致发光效率和环境可持续性，是高效和稳定的深蓝色照明的引人注目的解决方案。

研究组提出了一种杂化的碘化铜，具有接近统一的光致发光量子产率（99.6%），发射波长为449 nm和色坐标（0.147,0.087），以及其发射机理和电荷输运特性。研究组将这种杂化薄膜作为唯一的有源发射层来制造深蓝发光二极管，并随后通过双界面氢键钝化策略提高器件性能。这种协同表面修饰方法将氢键受体自组装单层与超薄聚甲基丙烯酸甲酯覆盖层结合在一起，有效地钝化了碘化铜杂化发射层的两个异质结，并优化了电荷注入。

研究组实现了12.57%的最高外量子效率，最大亮度达3,970.30 cd/m²（色坐标(0.147, 0.091)），在常温常湿条件下获得204小时的优异工作稳定性（半衰期寿命）。进一步制备的4 cm²大面积器件仍保持高效率。研究组表明铜碘基杂化材料在固态照明与显示技术领域具有应用潜力，为提升器件性能提供了通用策略。

附：英文原文

Title: Dual interfacial H-bonding-enhanced deep-blue hybrid copper–iodide LEDs

Author: Zhu, Kun, Reid, Obadiah, Rangan, Sylvie, Wang, Li, Li, Jingbai, Antony Jesu Durai, Kevin, Zhou, Kang, Javed, Nasir, Kasaei, Leila, Yang, Chongqing, Li, Mingxing, Sun, Yue, Tan, Kui, Cotlet, Mircea, Liu, Yi, Feldman, Leonard C., OCarroll, Deirdre M., Zhu, Kai, Li, Jing

Issue&Volume: 2025-07-16

Abstract: Solution-processed light-emitting diodes based on non-toxic copper–iodide hybrids1 are a compelling solution for efficient and stable deep-blue lighting, owing to their tunability, high photoluminescence efficiency and environmental sustainability2. Here we present a hybrid copper–iodide that shows near-unity photoluminescence quantum yield (99.6%) with an emission wavelength of 449nm and colour coordinates (0.147,0.087), alongside its emission mechanism and charge transport characteristics. We use the thin film of this hybrid as the sole active emissive layer to fabricate deep-blue light-emitting diodes and subsequently enhance the device performance through a dual interfacial hydrogen-bond passivation strategy. This synergetic surface modification approach, integrating a hydrogen-bond-acceptor self-assembled monolayer with an ultrathin polymethyl methacrylate capping layer, effectively passivates both heterojunctions of the copper–iodide hybrid emissive layer and optimizes charge injections. We achieve a maximum external quantum efficiency of 12.57%, a maximum luminance of 3,970.30cdm2 with colour coordinates (0.147,0.091) and an excellent operational stability (half-lifetime) of 204hours under ambient conditions. We further showcase a large-area device of 4cm2 that maintains high efficiency. Our findings reveal the potential of copper–iodide-based hybrid materials for applications in solid-state lighting3 and display technologies4, offering a versatile strategy for enhancing device performances.

DOI: 10.1038/s41586-025-09257-8

Source: https://www.nature.com/articles/s41586-025-09257-8