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用于发光应用的无铅卤化物双钙钛矿纳米晶体：提高效率和稳定性的策略

Lead-Free Halide Double Perovskite Nanocrystals for Light-Emitting Applications: Strategies for Boosting Efficiency and Stability.

作者信息

Tang Huidong, Xu Yanqiao, Hu Xiaobo, Hu Qing, Chen Ting, Jiang Weihui, Wang Lianjun, Jiang Wan

机构信息

School of Material Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333001 P. R. China.

Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of Education Donghua University Shanghai 201620 P. R. China.

出版信息

Adv Sci (Weinh). 2021 Mar 3;8(7):2004118. doi: 10.1002/advs.202004118. eCollection 2021 Apr.

DOI:10.1002/advs.202004118
PMID:33854898
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8025037/
Abstract

Lead-free halide double perovskite (HDP) nanocrystals are considered as one of the most promising alternatives to the lead halide perovskite nanocrystals due to their unique characteristics of nontoxicity, robust intrinsic thermodynamic stability, rich and tunable optoelectronic properties. Although lead-free HDP variants with highly efficient emission are synthesized and characterized, the photoluminescent (PL) properties of colloidal HDP nanocrystals still have enormous challenges for application in light-emitting diode (LED) devices due to their intrinsic and surface defects, indirect band, and disallowable optical transitions. Herein, recent progress on the synthetic strategies, ligands passivation, and metal doping/alloying for boosting efficiency and stability of HDP nanocrystals is comprehensive summarized. It begins by introducing the crystalline structure, electronic structure, and PL mechanism of lead-free HDPs. Next, the limiting factors on PL properties and origins of instability are analyzed, followed by highlighting the effects of synthesis strategies, ligands passivation, and metal doping/alloying on the PL properties and stability of the HDPs. Then, their preliminary applications for LED devices are emphasized. Finally, the challenges and prospects concerning the development of highly efficient and stable HDP nanocrystals-based LED devices in the future are proposed.

摘要

无铅卤化物双钙钛矿（HDP）纳米晶体因其无毒、固有的热力学稳定性强、光电性能丰富且可调谐等独特特性，被认为是卤化铅钙钛矿纳米晶体最有前途的替代物之一。尽管已经合成并表征了具有高效发射的无铅HDP变体，但由于胶体HDP纳米晶体存在固有和表面缺陷、间接带隙以及禁戒光学跃迁，其光致发光（PL）特性在发光二极管（LED）器件中的应用仍面临巨大挑战。在此，全面总结了在提高HDP纳米晶体效率和稳定性的合成策略、配体钝化以及金属掺杂/合金化方面的最新进展。首先介绍了无铅HDP的晶体结构、电子结构和PL机制。接着分析了PL特性的限制因素和不稳定性的根源，随后重点阐述了合成策略、配体钝化以及金属掺杂/合金化对HDP的PL特性和稳定性的影响。然后强调了它们在LED器件中的初步应用。最后，提出了未来开发基于高效稳定HDP纳米晶体的LED器件所面临的挑战和前景。

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