Epitaxial growth of CsPbCl3@Cs2NaInCl6 core-shell nanocrystals with enhanced luminescence and stability

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-02-16 DOI:10.1016/j.optmat.2026.117977

Guiyuan Liu, Wannan Dai, Ziyue Wang, Xiaotian Lu, Ying Ma

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引用次数: 0

Abstract

Metal halide perovskite (MHP) nanocrystals (NCs) exhibit outstanding optoelectronic properties, making them promising candidates for light-emitting diodes (LEDs). However, their practical application is severely hindered by poor environmental stability. Specifically, violet-emitting CsPbCl₃ NCs suffer from low luminescence properties because of deep-level trap-mediated non-radiative recombination. Here, we report a core-shell structure in which a CsPbCl₃ NC is epitaxially coated with a Cs₂NaInCl₆ double perovskite shell via a hot-injection method. The resulting CsPbCl₃@Cs₂NaInCl₆ heterostructures feature type-I band alignment, enabling effective surface defect passivation and strong charge carrier confinement within the CsPbCl₃ core. As a result, the photoluminescence quantum yield (PLQY) of CsPbCl₃ NCs increases dramatically from 4.4% to 49.5%, accompanied by a prolonged photoluminescence lifetime and a narrower emission spectral full width at half maximum (FWHM). Beyond luminescence enhancement, the Cs₂NaInCl₆ shell imparts remarkable resistance against damage from water, UV irradiation, and heat. Furthermore, the same encapsulation strategy significantly improves the stability of Mn and Ni-doped CsPbCl₃ (CsPbCl₃:Mn and CsPbCl₃:Ni) NCs. This work provides an effective strategy to simultaneously enhance luminescence performance and environmental stability of CsPbCl₃ NCs through passivation with a double perovskite shell.

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具有增强发光和稳定性的CsPbCl3@Cs2NaInCl6核壳纳米晶体的外延生长

金属卤化物钙钛矿（MHP）纳米晶体（NCs）具有出色的光电性能，使其成为发光二极管（led）的有希望的候选者。然而，环境稳定性差严重阻碍了它们的实际应用。具体来说，由于深能级阱介导的非辐射重组，紫色发射CsPbCl3 nc的发光性能较低。在这里，我们报道了一种核壳结构，其中CsPbCl3 NC通过热注入方法外延涂覆Cs2NaInCl6双钙钛矿壳。所得到的CsPbCl3@Cs2NaInCl6异质结构具有i型带对准，能够在CsPbCl3芯内实现有效的表面缺陷钝化和强载流子约束。结果表明，CsPbCl3 NCs的光致发光量子产率（PLQY）从4.4%显著提高到49.5%，光致发光寿命延长，半峰发射光谱全宽（FWHM）变窄。除了发光增强外，Cs2NaInCl6外壳还具有显著的抗水、紫外线照射和热损伤的能力。此外，相同的封装策略显著提高了Mn和Ni掺杂CsPbCl3 (CsPbCl3:Mn和CsPbCl3:Ni) nc的稳定性。本研究提供了一种通过双钙钛矿壳钝化CsPbCl3 NCs同时提高其发光性能和环境稳定性的有效策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.