Pb2+-doped zero-dimensional zinc-based halides possess high green purity and narrow-band emission

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-05-01 DOI:10.1016/j.ceramint.2025.01.573

Zhipeng Xiong, Changhui Miao, Yanhua Fu, Xiaoling Zeng, Dandan Sun, Lixin Yu

{"title":"Pb2+-doped zero-dimensional zinc-based halides possess high green purity and narrow-band emission","authors":"Zhipeng Xiong, Changhui Miao, Yanhua Fu, Xiaoling Zeng, Dandan Sun, Lixin Yu","doi":"10.1016/j.ceramint.2025.01.573","DOIUrl":null,"url":null,"abstract":"<div><div>Lead-free all-inorganic perovskites exhibit superior optical performance and potential applications due to their unique low-dimensional structures and low toxicity. However, Cs<sub>2</sub>ZnBr<sub>4</sub> nanocrystals (NCs) with the zero-dimensional (0D) structure demonstrate poor optical properties because of its typical soft lattice characteristics and high density of defect states. In this study, Cs<sub>2</sub>ZnBr<sub>4</sub> encapsulated with a molecular sieve (MS) is synthesized via a solid-state method, introducing a small amount of Pb<sup>2+</sup> to achieve narrow-band green emission with a full width at half maximum (FWHM) of 20 nm. The photoluminescence quantum yield (PLQY) is improved significantly from 0.56 % to 25.97 %. The temperature-dependent PL, ultraviolet–visible absorption, and time-resolved spectra indicate that this remarkable enhancement of fluorescence characteristics is attributed to the incorporation of Pb<sup>2+</sup>, which creates new luminescent centers. This result implies higher energy utilization efficiency and alleviates the soft lattice characteristics of the 0D structure, thereby reducing non-radiative recombination. In addition, the stability of Cs<sub>2</sub>ZnBr<sub>4</sub> NCs can be enhanced by Pb<sup>2+</sup> doping, showing significant improvements in both water and thermal stability tests. The effects of different pore sizes of the MS on the fluorescence performance and stability of the synthesized samples are investigated, all of which exhibit the bright green emission with color purity greatly exceeding the National Television Standards Committee (NTSC) standards.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17984-17992"},"PeriodicalIF":5.1000,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0272884225006303","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

Lead-free all-inorganic perovskites exhibit superior optical performance and potential applications due to their unique low-dimensional structures and low toxicity. However, Cs₂ZnBr₄ nanocrystals (NCs) with the zero-dimensional (0D) structure demonstrate poor optical properties because of its typical soft lattice characteristics and high density of defect states. In this study, Cs₂ZnBr₄ encapsulated with a molecular sieve (MS) is synthesized via a solid-state method, introducing a small amount of Pb²⁺ to achieve narrow-band green emission with a full width at half maximum (FWHM) of 20 nm. The photoluminescence quantum yield (PLQY) is improved significantly from 0.56 % to 25.97 %. The temperature-dependent PL, ultraviolet–visible absorption, and time-resolved spectra indicate that this remarkable enhancement of fluorescence characteristics is attributed to the incorporation of Pb²⁺, which creates new luminescent centers. This result implies higher energy utilization efficiency and alleviates the soft lattice characteristics of the 0D structure, thereby reducing non-radiative recombination. In addition, the stability of Cs₂ZnBr₄ NCs can be enhanced by Pb²⁺ doping, showing significant improvements in both water and thermal stability tests. The effects of different pore sizes of the MS on the fluorescence performance and stability of the synthesized samples are investigated, all of which exhibit the bright green emission with color purity greatly exceeding the National Television Standards Committee (NTSC) standards.

查看原文本刊更多论文

掺杂Pb2+的零维锌基卤化物具有较高的绿色纯度和窄带发射特性

无铅全无机钙钛矿由于其独特的低维结构和低毒性，具有优越的光学性能和潜在的应用前景。然而，具有零维（0D）结构的Cs2ZnBr4纳米晶体（NCs）由于其典型的软晶格特性和高密度的缺陷态而表现出较差的光学性能。在本研究中，采用固态法合成了以分子筛（MS）包封的Cs2ZnBr4，引入少量Pb2+，实现了全宽半宽（FWHM）为20 nm的窄带绿色发射。光致发光量子产率（PLQY）由0.56%提高到25.97%。温度相关的PL、紫外可见吸收光谱和时间分辨光谱表明，这种显著的荧光特性增强归因于Pb2+的掺入，它产生了新的发光中心。这一结果意味着更高的能量利用效率，缓解了0D结构的软晶格特性，从而减少了非辐射复合。此外，掺杂Pb2+可以增强Cs2ZnBr4纳米碳管的稳定性，在水稳定性和热稳定性测试中都表现出显著的改善。考察了不同孔径的质谱对合成样品荧光性能和稳定性的影响，合成样品均呈现亮绿色发射，色纯度大大超过美国国家电视标准委员会（NTSC）标准。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.