Tuning the emission color of SrLaAlO4:Er,Yb upconversion phosphors by decorating their surface with CsPbBr3-xIx quantum dots

IF 5.1 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-10-05 DOI:10.1016/j.ceramint.2024.10.032
Carlos Rodriguez-Garcia , Diego Esparza , Jorge Oliva
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Abstract

In this work, SrLaAlO4:Er3+ (2 mol%),Yb3+ (4 mol%) upconversion phosphor was synthesized by using a combustion method. Later, CsPbBr3-xIx (x = 0, 1.5 and 0.75) perovskite quantum dots (QDs) were synthesized by using hot injection method. According the analysis by X-ray diffraction, the SrLaAlO4:Er,Yb (SL:Er,Yb) phosphors and QDs had tetragonal and cubic phases, respectively. Moreover, the analysis by microscopy revealed that the SL:Er,Yb phosphors are composed of micro-grains with irregular morphology, while the CsPbBr3-xIx QDs had a morphology of cubes. The surface of the SL:Er,Yb phosphors was decorated with CsPbBr3-xIx QDs and obtained three composite powders: CsPbBr3+SL:Er,Yb, CsPbBr1.5I1.5+SL:Er,Yb and CsPbBr2.25I0.75+SL:Er,Yb. Those composites were firstly excited with UV light (380 nm) and produced emissions in the green and orange-red regions by downconversion. Interestingly, the emission intensity of the composite powders was 45–75 % higher than that for the individual CsPbBr3-xIx QDs or SL:Er,Yb phosphors. Later, the same composite powders were excited with NIR light (980 nm), in consequence, intense green and yellow emissions were produced by upconversion. In particular, the CsPbBr1.5I1.5+ SL:Er,Yb composite produced strong red emission by upconversion because the presence of the QDs on the SL:Er,Yb surface promoted the following cross relaxation process: 4I11/2 (Er3+)+ 4F7/2 (Er3+)→4F9/2 (Er3+)+ 4F9/2 (Er3+). In general, the quantum dots deposited on the SL:Er,Yb surface not only enhanced the red upconversion emission, but also provoked a color tuning when they are excited with NIR or UV light. Those last effects have not been reported in the literature previously. Thus, the results of this investigation demonstrate that combining perovskite quantum dots and the SL:Er,Yb forms a luminescent material able to tune its emission by upconversion or downconversion. This last property can be utilized for the design of new LED based lamps, which are employed for general illumination in houses and buildings.
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通过在 SrLaAlO4:Er,Yb 上转换荧光粉表面装饰 CsPbBr3-xIx 量子点来调整其发射颜色
本研究采用燃烧法合成了 SrLaAlO4:Er3+ (2 mol%)、Yb3+ (4 mol%)上转换荧光粉。随后,采用热注入法合成了 CsPbBr3-xIx(x = 0、1.5 和 0.75)包晶量子点(QDs)。根据 X 射线衍射分析,SrLaAlO4:Er,Yb(SL:Er,Yb)荧光粉和 QDs 分别具有四方相和立方相。此外,显微镜分析表明,SL:Er,Yb 荧光粉由形态不规则的微晶粒组成,而 CsPbBr3-xIx QDs 的形态为立方体。用 CsPbBr3-xIx QDs 装饰 SL:Er,Yb 荧光粉的表面,得到了三种复合粉末:CsPbBr3+SL:Er,Yb、CsPbBr1.5I1.5+SL:Er,Yb 和 CsPbBr2.25I0.75+SL:Er,Yb。这些复合材料首先被紫外光(380 纳米)激发,并通过下转换产生绿色和橙红色区域的发射。有趣的是,复合粉末的发射强度比单个 CsPbBr3-xIx QDs 或 SL:Er,Yb 荧光粉高 45-75%。随后,用近红外光(980 纳米)激发相同的复合粉末,结果通过上转换产生了强烈的绿色和黄色发射。特别是 CsPbBr1.5I1.5+ SL:Er,Yb 复合材料通过上转换产生了强烈的红色发射,这是因为 SL:Er,Yb 表面的 QDs 促进了以下交叉弛豫过程:4I11/2 (Er3+)+ 4F7/2 (Er3+)→4F9/2 (Er3+)+ 4F9/2 (Er3+)。总的来说,沉积在 SL:Er,Yb 表面的量子点不仅增强了红色上转换发射,而且在近红外或紫外光的激发下还产生了颜色调谐。这些效果在以前的文献中都没有报道过。因此,这项研究结果表明,将包晶量子点和 SL:Er,Yb 结合在一起,就能形成一种发光材料,能够通过上转换或下转换来调节其发射。最后一种特性可用于设计新型 LED 灯,这种灯可用于房屋和建筑物的一般照明。
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
Ceramics International
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.
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