Sodium doped CsPbI3-PMMA composite electrospun fibrous membranes for aqueous photocatalyst and LED

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2024-11-25 DOI:10.1016/j.mseb.2024.117835

Haohan Yang , Ke Li , Yuang Ji , Donghai Lin , Wan Y. Shih , Wei-Heng Shih

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引用次数: 0

Abstract

All-inorganic CsPbI₃ halide perovskite nanocrystals exhibit excellent photoluminescent properties, but their ambient instability presents a challenge. Adding dopants has been an effective way to improve stability. However, very few work was done for CsPbI_3, which is relevant for optoelectronic and photovoltaic applications. Here sodium doped CsPbI₃ nanocrystals were precipitated in situ in PMMA polymer matrix at room temperature using an electrospinning technique. It was found that the sodium doping improved the photoluminescence intensity and stability of Na-doped CsPbI₃@PMMA electrospun fibrous membranes (EFMs) both in air and in water with an optimal concentration of Na/Pb = 0.75. It is speculated that sodium doping creates a core–shell structure with the sodium passivates the shell while the emission wavelength of the core blue-shifts due to the quantum confinement effect. Furthermore, EFMs can be used as photocatalysts to degrade methyl orange and to create white-LED with CIE of (0.2935, 0.3304) and color temperature of 7227 k.

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用于水性光催化剂和 LED 的钠掺杂 CsPbI3-PMMA 复合电纺纤维膜

全无机 CsPbI3 卤化物包晶石纳米晶体具有出色的光致发光特性，但其环境不稳定性也是一个挑战。添加掺杂剂是提高稳定性的有效方法。然而，针对与光电和光伏应用相关的 CsPbI3 所做的工作却很少。本文采用电纺丝技术，在室温下将钠掺杂的 CsPbI3 纳米晶体原位沉淀在 PMMA 聚合物基质中。研究发现，在 Na/Pb = 0.75 的最佳浓度下，掺钠提高了掺钠 CsPbI3@PMMA 电纺丝纤维膜（EFMs）在空气中和水中的光致发光强度和稳定性。据推测，钠掺杂产生了一种核壳结构，钠使壳钝化，而核的发射波长则由于量子约束效应而发生蓝移。此外，EFMs 还可用作光催化剂来降解甲基橙，并产生 CIE 值为 (0.2935, 0.3304) 和色温为 7227 k 的白光 LED。

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

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.