Hue-changing luminescence and near-ultraviolet/X-ray dual excitation properties of GdTaO4 multi-doped with Eu3+, Er3+ and Tm3+

초록

In this study, we investigated novel luminescence properties of GdTaO<inf>4</inf>, a material with high density and high effective atomic number, doped singly and triply with Eu3+, Er3+, and Tm3+ (GTO:RE, RE = Eu, Er, and Tm). Single-doped samples, GTO:Eu, GTO:Er, and GTO:Tm, exhibit distinct red, green, and blue color emissions with high purity, respectively. For the triple-doped samples, we obtain a high tunability of emission color depending on the excitation wavelength. The emission hue changes in the order of blue-purple-cyan-white-yellow-green-magenta with the increase in the excitation wavelength in the near-ultraviolet (NUV) range. Furthermore, we observe a significant X-ray-excited luminescence for GTO:RE. Our findings suggest that GTO:RE can be a multimodal phosphor providing versatile luminescence properties, such as the colorful emission hue change and dual excitation luminescence under both NUV and X-ray excitations. © 2025 Chinese Society of Rare Earths

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