Cr3+ doped NaYF4:Er3+/Yb3+ robust green luminescent upconversion nanophosphors for temperature sensing and photonic applications

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2026-06-01 Epub Date: 2026-01-26 DOI:10.1016/j.optmat.2026.117922

Shouvik Choudhury , Shruti Narayanan , Debojyoti Ray Chawdhury , Prem B. Bisht

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引用次数: 0

Abstract

Upconversion nanophosphors are synthesized by Er³⁺ (1 %)/Yb³⁺ (40 %) co-doping of hexagonal NaYF₄ in the presence of a transition metal ion Cr³⁺ by hydrothermal method. Cr³⁺ ion concentration was systematically increased in steps of 5 % (0–20 %) to study the effect of doping concentration. X-ray diffraction study confirmed the formation of the hexagonal phase for the nanophosphors. X-ray photoelectron spectroscopy study showed successful rare earth and Cr³⁺ ion doping into the lattice. An order of magnitude enhancement of green luminescence was observed upon doping the systems with Cr³⁺ ions. The photoluminescence (PL) intensity shows maximum at 15 % Cr³⁺ doping. Temperature dependent PL study indicates its high sensitivity. The colour purity of the system is found to be 97 %. Nonlinear optical studies showed the manifestation of reverse saturable absorption phenomenon owing to the sequential multiphoton absorption and energy transfer mechanism. This phenomenon is useful in imaging applications.

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用于温度传感和光子应用的Cr3+掺杂NaYF4:Er3+/Yb3+稳健绿色发光上转换纳米荧光粉

在过渡金属离子Cr3+的存在下，采用水热法制备了Er3+(1 %)/Yb3+（40 %）共掺杂六方型NaYF4的上转换纳米荧光粉。系统地以5 %（0 ~ 20 %）的速度增加Cr3+离子浓度，研究掺杂浓度的影响。x射线衍射研究证实了纳米荧光粉六方相的形成。x射线光电子能谱研究表明稀土和Cr3+离子成功掺杂到晶格中。在掺杂Cr3+离子后，系统的绿色发光增强了一个数量级。当Cr3+掺杂率为15% %时，光致发光强度最大。实验结果表明，该方法具有较高的灵敏度。该系统的颜色纯度为97 %。非线性光学研究表明，由于多光子的顺序吸收和能量传递机制，存在反向饱和吸收现象。这种现象在成像应用中很有用。

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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.