中国科学院长春应用化学研究所秦川江团队开发了用于高效钙钛矿型发光二极管的膦酸盐氧化膦二元添加剂。相关研究成果于2022年1月25日发表于国际顶尖学术期刊《德国应用化学》。

添加剂对高效钙钛矿型发光二极管（PeLEDs）起着关键作用。

该文中，研究人员报道了一种具有钝化缺陷和增强载流子辐射复合的独特双重作用的新型膦酸盐/氧化膦二元分子添加剂（PE-TPPO），以提高金属卤化物钙钛矿的器件效率。除了氧化膦基团的缺陷钝化效应，以增强钙钛矿薄膜的光致发光强度和均匀性，在电致发光过程中，具有强电子亲和力的膦酸基团可以捕获注入的电子，提高局部载流子浓度，加速载流子辐射复合。由于它们对器件效率的协同增强，用这种二元添加剂改性的准二维绿色peled显示出最大的外部量子效率、电流效率和功率效率，分别为25.1%、100.5 cd/A和98.7 lm/W，是目前报道的最高效率之一。

附：英文原文

Title: Phosphonate/Phosphine Oxide Dyad Additive for Efficient Perovskite Light-Emitting Diodes

Author: Chenyang Zhao, Wenping Wu, Hongmei Zhan, Wei Yuan, Hongxiang Li, Dezhong Zhang, Dapeng Wang, Yanxiang Cheng, Shiyang Shao, Chuanjiang Qin, Lixiang Wang

Issue&Volume: 2022-01-25

Abstract: Additive plays critical role for efficient perovskite light-emitting diodes (PeLEDs). Here, we report a novel phosphonate/phosphine oxide dyad molecular additive (PE-TPPO), with unique dual roles of passivating defects and enhancing carrier radiative recombination, to boost the device efficiency of metal-halide perovskites. In addition to the defect passivation effect of the phosphine oxide group to enhance the photoluminescence intensity and homogeneity of perovskite film, the phosphonate group with strong electron affinity can capture the injected electrons to increase local carrier concentration and accelerate carrier radiative recombination in electroluminescence process. Owing to their synergistic enhancement on device efficiency, quasi-two dimensional green PeLEDs modified by this dyad additive exhibit maximum external quantum efficiency, current efficiency, and power efficiency of 25.1%, 100.5 cd/A, and 98.7 lm/W, which are among the reported state-of-the-art efficiencies.

DOI: 10.1002/anie.202117374

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202117374