A series of Li₂SrSiO₄:xTb³⁺ (0.2%, 0.4%, 0.6%, 0.8%, 2%, 4%, and 6%) phosphors were prepared by conventional solid‐state reaction. It was found that this silicate phosphor has a wide excitation band at near‐ultraviolet region (230‐300 nm) due to spin‐allowed 4f ⁸→4f⁷5d¹ transitions of Tb³⁺ ions, with the exact position dependent on the crystal field of the lattice. The cross‐relaxation process originating from ⁵D₃→⁵D₄ and ⁷F₆→⁷F₀ happened between different Tb³⁺ ions. It leads to the luminescence color of Li₂SrSiO₄: xTb³⁺ tuning from blue to green just by controlling Tb³⁺ concentrations. Furthermore, concentration quenching mechanism, energy migration type, cross‐relaxation rate and efficiency, are discussed in detail. Finally, optical thermometry properties were investigated via temperature‐dependent emission spectra. The results show that low‐concentration‐doped sample (Li₂SrSiO₄:0.4%Tb³⁺) shows remarkable optical thermometry based on fluorescence intensity ratio (FIR) between the blue and green emission of Tb³⁺ ions, whereas the high‐concentration‐doped sample (Li₂SrSiO₄:4%Tb³⁺) demonstrates small emission intensity loss. It illustrates that terbium‐doped silicate phosphor is a multifunctional material with potential application for display field and optical thermometry.

中文翻译：

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由于交叉弛豫过程和光学测温研究，Li2SrSiO4：Tb3 +的可调发射色

通过常规固态反应制备了一系列Li ₂ SrSiO ₄：xTb ³⁺（0.2％，0.4％，0.6％，0.8％，2％，4％和6％）的荧光粉。发现该硅酸盐磷光体由于Tb ³⁺离子的自旋允许4f ⁸ → 4f ⁷ 5d ¹跃迁而在近紫外区（230-300 nm）处具有较宽的激发带，其确切位置取决于晶体晶格的场。交叉松弛过程源自⁵ D ₃ → ⁵ D ₄和⁷ F ₆ → ⁷ F ₀ 发生在不同的Tb ³⁺离子之间。仅通过控制Tb ^3+的浓度，就可以使Li ₂ SrSiO ₄：xTb ³⁺的发光颜色从蓝色变为绿色。此外，还详细讨论了浓度淬灭机理，能量迁移类型，交叉弛豫速率和效率。最后，通过与温度有关的发射光谱研究了光学测温特性。结果表明，基于Tb ³⁺的蓝色和绿色发射之间的荧光强度比（FIR），低浓度掺杂的样品（Li ₂ SrSiO ₄：0.4％Tb ³⁺）显示出了显着的光学测温。离子，而高浓度掺杂的样品（Li ₂ SrSiO ₄：4％Tb ³⁺）显示出较小的发射强度损失。它说明了掺硅酸盐磷光体是一种多功能材料，在显示领域和光学测温领域具有潜在的应用前景。