Abstract A series of Tb3+ doped Ca2Ga2SiO7 were successfully prepared by conventional solid-state reaction technique and characterized via X-ray diffraction (XRD), photoluminescence excitation and emission spectra, and luminescent decay curve. XRD analysis revealed the presence of a single phase tetrahedral structure of Ca2Ga2SiO7 belonging to P 4 ¯ 21 m space group. The emission spectra revealed peaks arising from both 5D3 and 5D4 level under the most intense excitation of 374 nm, and the emission color varied from blue to green via greenish-yellow by altering the Tb3+ concentrations. The energy transfer interaction between Tb3+ ions was dipole-dipole in nature, as evident from the Dexter theory and Inokuti- Hirayama model. The emission intensity remained at 95.28 % and 86.30 % of the initial value at 398 K and 498 K for the optimized sample, respectively indicating strong thermal stability. The results mentioned above indicated that Tb3+ doped thermally stable Ca2Ga2SiO7 has potential application in the w-LEDs.

中文翻译：

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用于三色 w-LED 的热稳定 Ca2Ga2SiO7:Tb3+ 绿色荧光粉

摘要 采用常规固相反应技术成功制备了一系列Tb3+掺杂Ca2Ga2SiO7，并通过X射线衍射（XRD）、光致发光激发和发射光谱以及发光衰减曲线进行表征。XRD 分析表明存在属于 P 4 ¯ 21 m 空间群的 Ca2Ga2SiO7 单相四面体结构。发射光谱揭示了在 374 nm 最强烈激发下 5D3 和 5D4 能级产生的峰，并且通过改变 Tb3+ 浓度，发射颜色从蓝色变为绿色至绿黄色。从 Dexter 理论和 Inokuti-Hirayama 模型可以看出，Tb3+ 离子之间的能量转移相互作用本质上是偶极-偶极。优化样品在 398 K 和 498 K 时的发射强度保持在初始值的 95.28% 和 86.30%，分别表明热稳定性强。上述结果表明 Tb3+ 掺杂的热稳定 Ca2Ga2SiO7 在 w-LED 中有潜在的应用。