颜色可调二氧化硅涂层碳点封装LaCaAl3O7:Eu3+荧光粉：桥接先进照明和多模态安全应用

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-05-01 DOI:10.1016/j.jtice.2025.106145

S. Priyanka Chakradhar , B.R. Radha Krushna , S.C. Sharma , Augustine George , P. Manod , K. Ponnazhagan , K. Manjunatha , Sheng Yun Wu , H. Nagabhushana

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引用次数: 0

摘要

以椰子水为燃料，采用简单溶液燃烧法合成了一系列新型的二氧化硅（SiO₂）包覆碳点（CDs）接枝到LaCaAl₃O₇：Eu³⁺（LCAO:Eu³⁺）杂化荧光粉。这些纳米复合材料（nc）被设计用来增强LCAO:Eu³⁺基质的光致发光（PL）性能。CDs改善了红光Eu³⁺的吸收截面，显着提高了发光强度。NCs具有颜色可调性和温度敏感性，使其适合于照明和防伪应用。方法将不同浓度的CDs掺入LCAO:Eu³+基质中，再包覆SiO 2以提高PL性能。通过调节CDs浓度和激发波长来调节发射光谱。进行了全面的PL表征，重点是量子产率（QY），发光强度和实际应用的颜色可调性。加入CDs后，LCAO:3Eu³⁺的发光强度提高了21.32倍，达到87.72%，SiO₂涂层后，LCAO:3Eu³⁺的发光强度进一步提高到88.69倍。nc显示可调的发射光谱（粉红色到深蓝色）和白色发光（w- led）的高显色指数93。它们作为光学温度计，在460 K时具有3.02% K⁻¹的灵敏度。SiO₂/CDs(1,3,15,25 wt %)@LCAO:3Eu³⁺产生独特的发光模式，实现了强大的防伪和多级加密认证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Color-tunable silica-coated-carbon dot-encapsulated LaCaAl3O7:Eu3+ phosphor: Bridging advanced lighting and multimodal security applications

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Color-tunable silica-coated-carbon dot-encapsulated LaCaAl3O7:Eu3+ phosphor: Bridging advanced lighting and multimodal security applications

Background

A novel series of silica (SiO₂) coated carbon dots (CDs) grafted onto LaCaAl₃O₇:Eu³⁺ (LCAO:Eu³⁺) hybrid phosphors is synthesized using a simple solution combustion method with coconut water as the fuel. These nanocomposites (NCs) are designed to enhance the photoluminescence (PL) properties of the LCAO:Eu³⁺ matrix. CDs improved the absorption cross-section of red-emitting Eu³⁺ ions, significantly increasing luminescence intensity. The NCs exhibited color tunability and temperature sensitivity, making them suitable for applications in lighting and anticounterfeiting.

Methods

The NCs are synthesized by incorporating various concentrations of CDs into the LCAO:Eu³⁺ matrix, followed by SiO₂ coating to improve PL performance. The emission spectra are tuned by adjusting the CDs concentration and excitation wavelength. Comprehensive PL characterizations are performed, focusing on quantum yield (QY), luminescence intensity, and color tunability for practical applications.

Significant Findings

Incorporating CDs achieved a PL QY of 87.72 % and enhanced LCAO:3Eu³⁺ luminescence intensity 21.32-fold, further improved to 88.69-fold with SiO₂ coating. The NCs displayed tunable emission spectra (pink to deep blue) and a high CRI of 93 for white light emitting (w-LEDs). They functioned as optical thermometers with 3.02 % K⁻¹ sensitivity at 460 K. SiO₂/CDs(1, 3, 15, 25 wt %)@LCAO:3Eu³⁺ produced unique luminescent patterns, enabling robust anticounterfeiting and multi-level encryption for authentication.

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.