Activation of Tm3+ single-photon NIR-to-NIR upconversion luminescence through Yb3+ doping in Tm2WO6 phosphor

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Optical Materials Pub Date : 2024-11-19 DOI:10.1016/j.optmat.2024.116459

Govind B. Nair, H.C. Swart, Rajagopalan Krishnan

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Abstract

Ceramic phosphors Tm_2-xWO₆:xYb³⁺ synthesized by solid-state reaction method. The up-conversion (UC) dynamics in the Yb³⁺-doped Tm₂WO₆ phosphor were investigated, which demonstrated a single-photon UC process from a near-infrared (NIR) excitation at 980 nm to an NIR emission corresponding to the ³H₄ → ³H₆ transition of Tm³⁺. X-ray photoelectron spectra confirmed the chemical states of the constituent elements. The diffuse reflectance spectra confirmed that Tm₂WO₆ requires doping with Yb³⁺ ions in order to be able to absorb the energy at 980 nm. UC emission properties of the phosphors depend on the Yb³⁺ ion concentration. NIR emission of Tm³⁺ is much stronger than visible emissions when Yb³⁺ doping. The NIR and red emissions were caused by a single-photon UC process, whereas the blue emission was caused by a two-photon process. The temperature-dependent UCL showed an initial rise in the UC intensity and then a consistent decrease with the variation in temperature.

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通过在 Tm2WO6 荧光粉中掺入 Yb3+ 激活 Tm3+ 单光子近红外-近红外上转换发光

采用固态反应方法合成了陶瓷荧光粉 Tm2-xWO6:xYb3+。研究了掺杂 Yb3+ 的 Tm2WO6 荧光中的上转换（UC）动力学，证明了从 980 纳米的近红外（NIR）激发到对应于 Tm3+ 的 3H4 → 3H6 转变的近红外发射的单光子 UC 过程。X 射线光电子能谱证实了组成元素的化学状态。漫反射光谱证实，Tm2WO6 需要掺杂 Yb3+ 离子才能吸收 980 纳米波长的能量。荧光粉的 UC 发射特性取决于 Yb3+ 离子的浓度。当掺杂 Yb3+ 离子时，Tm3+ 的近红外发射远强于可见光发射。近红外和红色发射是由单光子 UC 过程引起的，而蓝色发射则是由双光子过程引起的。与温度相关的 UCL 显示，UC 强度最初上升，然后随着温度的变化持续下降。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.