Abstract The Er3+ and Eu3+ single- and co-doped Ba3La6(SiO4)6 (BLSO) phosphors with tunable emission properties were prepared by a citric acid-based sol-gel method. The crystal structure, purity, surface morphology and luminescence properties of the phosphors samples were investigated systematically by X-ray diffraction patterns, scanning electron microscope images, and photoluminescence (PL) spectra, respectively. The prepared BLSO phosphors showed pure hexagonal crystal structure with a space group of P63/m (176) and exhibited agglomerated surface morphology. Possibly, the energy migration mechanism from Er3+ to Eu3+ ions was explored and it was further confirmed by determining the PL decay lifetime values of the corresponding co-doped phosphor materials. The Er3+ and Eu3+ single-doped BLSO phosphors showed green and red emissions under 380 and 394 nm excitations, respectively. Additionally, the energy transfer efficiency was calculated, which was around 63.4% at 0.2 mM of Eu3+ ion concentration. Moreover, the thermal stability fo the optimized single- and co-doped phosphors thermal stability was evaluated at different emission wavelengths. The obtained results indicate that the BLSO phosphors could be potentially used in solid-state lighting applications.

中文翻译：

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Ba3La6(SiO4)6：用于固态照明的 Er3+/Eu3+ 荧光粉的可调发光和能量转移行为

摘要 采用柠檬酸溶胶-凝胶法制备了具有可调发射特性的Er3+和Eu3+单掺杂和共掺杂Ba3La6(SiO4)6(BLSO)荧光粉。分别通过X射线衍射图、扫描电子显微镜图像和光致发光（PL）光谱系统地研究了荧光粉样品的晶体结构、纯度、表面形貌和发光性能。制备的 BLSO 荧光粉显示出空间群为 P63/m (176) 的纯六方晶体结构，并表现出团聚的表面形态。可能探索了从 Er3+ 到 Eu3+ 离子的能量迁移机制，并通过确定相应共掺杂磷光体材料的 PL 衰变寿命值进一步证实了这一点。Er3+ 和 Eu3+ 单掺杂 BLSO 荧光粉分别在 380 和 394 nm 激发下显示绿色和红色发射。此外，还计算了能量转移效率，在 Eu3+ 离子浓度为 0.2 mM 时，该效率约为 63.4%。此外，在不同的发射波长下评估了优化的单掺杂和共掺杂磷光体的热稳定性。获得的结果表明 BLSO 荧光粉可潜在地用于固态照明应用。