Lattice reconstruction for mixed-halide blue perovskite light-emitting diodes with high brightness, outstanding color stability and low efficiency roll-off

IF 6.8 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Science China Materials Pub Date : 2024-09-18 DOI:10.1007/s40843-024-3080-5

Jionghua Wu (, ), Renjie Wang (, ), Rui Zhang (, ), Giuseppe Portale, Eduardo Solano, Xiaoke Liu (, ), Feng Gao (, )

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Abstract

We report a simple, effective, and universal lattice reconstruction approach to improve the quality of perovskite films by using nonpolar solvents with high Gutmann donor numbers (DNs). We find that high-DN nonpolar solvents, for instance, ethyl acetate, can interact with perovskite precursors. Such a solvent can make the perovskite lattice more ordered and “harder” and promote the formation of heterostructures with low-dimensional perovskite impurities and residual solvent molecules. As a result, the lattice-reconstructed perovskite films exhibit reduced defect densities and suppressed ion migration. The resultant mixed-halide blue perovskite light-emitting diodes (PeLEDs) show greatly enhanced tolerance to high driving current densities and voltages, demonstrating high brightness, outstanding color stability and low efficiency roll-off. Our work provides a deep understanding of the interactions between nonpolar solvents and perovskites and offers useful guidelines for further development of high-power PeLEDs.

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用于混合卤化物蓝色过氧化物发光二极管的晶格重构，具有高亮度、出色的色彩稳定性和较低的效率衰减

我们报告了一种简单、有效和通用的晶格重构方法，通过使用具有高 Gutmann 供体数 (DN) 的非极性溶剂来提高透辉石薄膜的质量。我们发现，高 DN 非极性溶剂（如醋酸乙酯）可与包晶前驱体相互作用。这种溶剂可以使包晶石晶格更加有序和 "坚硬"，并促进低维包晶石杂质和残留溶剂分子异质结构的形成。因此，晶格重构后的透辉石薄膜缺陷密度降低，离子迁移受到抑制。由此产生的混合卤化物蓝色包晶发光二极管（PeLED）对高驱动电流密度和电压的耐受性大大增强，并表现出高亮度、出色的色彩稳定性和低效率衰减。我们的研究深入了解了非极性溶剂与包光体之间的相互作用，为进一步开发大功率 PeLED 提供了有用的指导。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.