用于高性能和自稳定发光电化学电池的多种生物电解质《Advanced Functional Materials》

用于高性能和自稳定发光电化学电池的多种生物电解质

【摘要】

发光电化学电池（LEC）是最简单和最便宜的固态照明技术，用于柔性电池/或一次性用途。然而，一个主要问题是向环保设备（发射器/电解质/电极）过渡，以满足绿色光电的要求，同时不损害设备性能。在此背景下，本研究显示了第一种应用于LEC的生物电解质，利用纤维素基电解质与典型发射器（共轭聚合物或CPs和离子过渡金属络合物或iTMCs）相结合，实现了自稳定和高性能的器件。与使用传统电解质的参考器件相比，自稳定性测试（环境存储/热应力）表明，使用这种生物电解质的器件长时间保持膜粗糙度和光致发光量子产率。此外，由于高介电常数，电荷注入得到增强，导致了很高的效率15 cd A⁻¹@3750cd m⁻²和2.5 cd A⁻¹@600cd m⁻²与CPs/iTMCs-LEC的稳定性分别为3000/7.5h和153/0.7J。与参考设备相比，它们表现出四倍/两倍的增强。因此，这种新的生物电解质方法不会像现有技术中的生物降解聚合物和DNA混合电解质那样降低器件性能，而化学修饰的简易性为未来的发展提供了很大的空间。总而言之，这项研究不仅加强了碳水化合物电解质在能源相关应用方面的相关性，而且也加强了其在照明新领域中的相关性。

Versatile Biogenic Electrolytes for Highly Performing and Self-Stable Light-Emitting Electrochemical Cells

Luca M. Cavinato, Gonzalo Millán, Julio Fernández-Cestau, Elisa Fresta, Elena Lalinde, Jesús R. Berenguer, Rubén D. Costa

Technical University of Munich, Schulgasse 22, D-94315 Straubing, Germany

First published: 24 April 2022

Advanced Functional Materials, Volume32, Issue29

July 18, 2022

https://doi.org/10.1002/adfm.202201975

Abstract

Light-emitting electrochemical cells (LECs) are the simplest and cheapest solid-state lighting technology for soft and/or single-use purposes. However, a major concern is a transition toward eco-friendly devices (emitters/electrolytes/electrodes) to meet green optoelectronic requirements without jeopardizing device performance. In this context, this study shows the first biogenic electrolyte applied to LECs, realizing self-stable and highly performing devices with cellulose-based electrolytes combined with archetypical emitters (conjugated polymers or CPs and ionic transition-metal complexes or iTMCs). In contrast to reference devices with traditional electrolytes, self-stability tests (ambient storage/thermal-stress) show that devices with this bio-electrolyte hold film roughness and photoluminescence quantum yields over time. In addition, charge injection is enhanced due to the high dielectric constant, leading to high efficacies of 15 cd A−1@3750 cd m−2 and 2.5 cd A−1@600 cd m−2 associated with stabilities of 3000/7.5 h and 153/0.7 J for CPs/iTMCs-LECs, respectively. They represent four-/twofold enhancement compared to reference devices. Hence, this novel biogenic electrolyte approach does not reduce device performance as in the prior-art bio-degradable polymer and DNA-hybrid electrolytes, while the easiness of chemical modification provides plenty of room for future developments. All-in-all, this study reinforces the relevance of carbohydrate-based electrolytes not only for energy-related applications, but also for a new field in lighting.

来源：《Advanced Functional Materials》

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