The challenge of building a highly reliable contactless temperature probe with high sensitivity, good temperature-induced color discriminability, and economical synthesis has prompted the research community to work in the field of rare-earth-based luminescence thermometry. Moreover, the fast-growing market for optoelectronic devices has increased the demand for tunable color-emitting phosphors. In this study, Dy³⁺/Eu³⁺ co-doped SrMoO₄ phosphors were developed as tunable color-emitting source and dual-mode luminescence thermometer. A facile and cost-effective auto-combustion method was used to synthesize the phosphors. Our work demonstrates a viable scheme for tailoring the emission of single-phase phosphors by precisely controlling the dopant concentrations and by modulating excitation wavelength. The overall emission is tuned from greenish-yellow to white and greenish-yellow to reddish-orange. A detailed energy transfer process from the host to the Ln³⁺ ions and between the Ln³⁺ ions is discussed. Further, anti-thermal quenching in the emission of Dy³⁺ ion is observed when excited with 297 nm. The dual-mode luminescence thermometry has been studied by analyzing the fluorescence intensity ratio of Dy³⁺ and Eu³⁺ ions upon excitation at 297 nm. The maximum relative sensitivity value for 4% Eu³⁺ co-doped SrMoO₄:4%Dy³⁺ phosphor is 1.46% K⁻¹ at 300 K. Furthermore, the configurational coordinate diagram is presented to elucidate the nature of temperature-dependent emission. Therefore, our research opens up new avenues for the development of color-tunable luminescent materials for various optoelectronic and temperature-sensing applications.

中文翻译：

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Dy3+/Eu3+共掺杂SrMoO4荧光粉的发射颜色调谐和双模发光测温设计


构建具有高灵敏度、良好的温度诱导颜色辨别能力和经济合成的高度可靠的非接触式温度探头的挑战促使研究界致力于稀土发光测温领域的工作。此外，快速增长的光电器件市场增加了对可调谐彩色荧光粉的需求。本研究开发了Dy ³⁺ /Eu ³⁺ 共掺杂SrMoO ₄ 荧光粉作为可调谐发色光源和双模发光温度计。采用一种简便且经济有效的自燃烧方法来合成荧光粉。我们的工作展示了一种通过精确控制掺杂剂浓度和调制激发波长来定制单相磷光体发射的可行方案。整体发射从绿黄色到白色以及绿黄色到红橙色。讨论了从主体到 Ln ³⁺ 离子以及 Ln ³⁺ 离子之间的详细能量转移过程。此外，当用 297 nm 激发时，观察到 Dy ³⁺ 离子发射的反热猝灭。通过分析Dy ³⁺ 和Eu ³⁺ 离子在297 nm激发下的荧光强度比，研究了双模发光测温技术。 4%Eu ³⁺ 共掺SrMoO ₄ :4%Dy ³⁺ 荧光粉最大相对灵敏度值为1.46%K ⁻¹ 在 300 K 下。此外，还提供了构型坐标图来阐明温度依赖性发射的性质。因此，我们的研究为开发用于各种光电和温度传感应用的颜色可调发光材料开辟了新途径。