Enhanced upconversion luminescence in (Ti1-xSix)O2:Er/Yb phosphors via optimization of calcination temperature and silicon content

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-07-09 DOI:10.1016/j.ceramint.2024.07.064

Kyeong Youl Jung, Byeong Ho Min, Da Hee Kim

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Abstract

(Ti_1-xSi_x)O₂:Er/Yb (0 ≤ x ≤ 0.3) phosphor was synthesized using spray pyrolysis, and the upconversion (UC) properties were optimized by varying the calcination temperature and Si content (x). By introducing Si into the TiO₂ matrix, the thermal stability of titania was effectively improved, allowing the anatase phase to be maintained even when the (Ti,Si)O₂:Er/Yb phosphor was calcined at temperatures above 800 °C. From investigating the effect of crystal size on the UC emission of (Ti,Si)O₂:Er/Yb, it was found the optimal crystal size of Antase to achieve the highest UC emission intensity is approximately 5.5 nm, beyond which the UC intensity decreases rapidly. With increasing Si content, the crystalltie size decreased linearly and more amorphous SiO₂ domains were formed in the anatase TiO₂ matrix, which could consume Er/Yb ions to form SiO₂:Er/Yb with low UC emission. Resultently, the UC emission intensity was significantly affected by Si content. The optimal calcination temperature and Si content to obtain the highest UC luminescence were determined as 700 °C and 10%, respectively. The optimized (Ti,Si)O₂:Er/Yb showed approximately 2.7 times improved UC luminescence than TiO₂:Er/Yb.

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通过优化煅烧温度和硅含量提高 (Ti1-xSix)O2:Er/Yb 荧光粉的上转换发光性能

利用喷雾热解合成了 (Ti1-xSix)O2:Er/Yb (0 ≤ x ≤ 0.3) 荧光粉，并通过改变煅烧温度和 Si 含量 (x) 优化了上转换 (UC) 性能。通过在二氧化钛基体中引入硅，有效地提高了二氧化钛的热稳定性，使（Ti,Si）O2：Er/Yb 荧光粉在 800 ℃ 以上的温度下煅烧时仍能保持锐钛矿相。通过研究晶体尺寸对(Ti,Si)O2:Er/Yb 超紫外发射的影响，发现要达到最高的超紫外发射强度，Antase 的最佳晶体尺寸约为 5.5 nm，超过这一尺寸，超紫外发射强度会迅速降低。随着硅含量的增加，晶体尺寸线性减小，锐钛矿二氧化钛基体中形成了更多的无定形二氧化硅畴，它们可以消耗 Er/Yb 离子，形成具有低 UC 发射的 SiO2:Er/Yb。因此，UC 辐射强度受到硅含量的显著影响。获得最高 UC 发光的最佳煅烧温度和硅含量分别被确定为 700 ℃ 和 10%。优化后的（Ti,Si）O2:Er/Yb 的 UC 发光性能比 TiO2:Er/Yb 提高了约 2.7 倍。

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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.