Enhanced fluorescence and stability of CsPbBr3 perovskite nanocrystals via MOF-5 encapsulation with hierarchical pore structures

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-08-01 DOI:10.1016/j.ceramint.2025.04.374

Yiyuan Peng , Mengbiao Liang , Ting Chen , Mengdi Zhao , Zhixiang Xie , Chunxian Guo

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引用次数: 0

Abstract

All-inorganic perovskite nanocrystals (CsPbX₃ NCs, X = Cl, Br, I) have emerged as promising candidates for applications in light-emitting diodes (LEDs), solar cells, photodetectors, and backlight displays, owing to their exceptional optoelectronic properties, including high photoluminescence quantum yield (PLQY), long carrier lifetimes, and narrow emission bandwidths. However, the intrinsic ionic nature of these nanocrystals renders them highly susceptible to environmental degradation, limiting their practical applications. Herein, we report the synthesis of CsPbBr₃@MOF-5 composites through a physical mixing method: room-temperature supersaturated recrystallization of CsPbBr₃ NCs, followed by encapsulation within a hierarchical porous zinc-based metal-organic framework (MOF-5). By incorporating poly(ethylene oxide)-block-poly(propyleneoxide)-block-poly(ethylene oxide) Pluronic (P123) and 1,3,5-trimethylbenzene (TMB) as structure-directing agents, the pore architecture of MOF-5 was tailored to exhibit hierarchical porosity (2–35 nm), significantly enhancing both the PLQY and stability of CsPbBr₃ NCs. The CsPbBr₃@MOF-5 composites achieved a remarkable PLQY improvement from 22 % to 56 %, retained 55 % of their initial PL intensity after 60 days of ambient storage, and maintained 65 % of PL emission under thermal stress (298–498 K). In contrast, pristine CsPbBr₃ NCs experienced complete quenching under identical conditions. Additionally, the composite exhibited superior resistance to anion exchange when combined with CsPbBr_xI_3-x NCs. A white LED (WLED) device fabricated using CsPbBr₃@MOF-5 composite and K₂SiF₆:Mn²⁺ (KSF) red phosphor exhibited a luminous efficiency of 20.71 lm/W, a correlated color temperature (CCT) of 5486 K, and a broad color gamut covering 133.3 % of the National Television Standards Committee (NTSC) standard, underscoring its potential for advanced lighting and display technologies.

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通过MOF-5包封分层孔结构增强CsPbBr3钙钛矿纳米晶体的荧光性和稳定性

全无机钙钛矿纳米晶体（CsPbX3 NCs, X = Cl, Br， I）由于其优异的光电性能，包括高光致发光量子产率（PLQY），长载流子寿命和窄发射带宽，已成为发光二极管（led），太阳能电池，光电探测器和背光显示器中应用的有希望的候选者。然而，这些纳米晶体固有的离子性质使它们极易受到环境退化的影响，限制了它们的实际应用。在此，我们报告了通过物理混合方法合成CsPbBr3@MOF-5复合材料：CsPbBr3 NCs的室温过饱和再结晶，然后在分层多孔锌基金属有机框架（MOF-5）内封装。通过加入聚环氧乙烷-嵌段聚环氧乙烷-嵌段聚环氧乙烷Pluronic （P123）和1,3,5-三甲基苯（TMB）作为结构导向剂，MOF-5的孔隙结构被调整为具有分层孔隙度（2-35 nm），显著提高了CsPbBr3 NCs的PLQY和稳定性。CsPbBr3@MOF-5复合材料的PLQY从22%提高到56%，在环境储存60天后保持了初始PL强度的55%，在热应力（298-498 K）下保持了65%的PL发射。相比之下，原始CsPbBr3 NCs在相同条件下完全淬火。此外，当与CsPbBrxI3-x NCs结合时，该复合材料表现出优异的阴离子交换抗性。利用CsPbBr3@MOF-5复合材料和K2SiF6:Mn2+ (KSF)红色荧光粉制备的白光LED （WLED）器件的发光效率为20.71 lm/W，相关色温（CCT）为5486 K，色域覆盖了国家电视标准委员会（NTSC）标准的133.3%，突出了其在先进照明和显示技术方面的潜力。

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.