Abstract The monoclinic (α) and triclinic (β) GdBO3 submicron-sized crystals doped with Eu3+ ions were synthesized using different approaches (sol-gel Pechini and hydrothermal method). The luminescence properties of these two types of GdBO3 are different due to the different symmetry of the local coordination environment of Eu3+ ions, embedded in the investigated materials. Crystal structures of GdBO3: Eu3+ were investigated using X-ray diffractometry under high-pressure conditions. High-pressure luminescent properties of the monoclinic and triclinic phases were investigated up to about 8 GPa, and they differ for two types of Eu3+-doped GdBO3 crystals. Changes in emission spectra, such as broadening and splitting of bands in the compression cycle are shown for both matrices with Eu3+ ions. The band centroid shifts and Stark sub-level were calculated and correlated with the increase in pressure value. The maximum shifts were 0.25 nm/GPa for the Stark sub-level of the 5D0→7F2 transition in the monoclinic GdBO3: Eu3+, and 0.35 nm/GPa for the Stark sub-level of the 5D0→7F1 transition in the triclinic GdBO3: Eu3+.

中文翻译：

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单斜和三斜 GdBO3 的高压发光：Eu3+

摘要 使用不同的方法（溶胶-凝胶 Pechini 和水热法）合成了掺杂 Eu3+ 离子的单斜 (α) 和三斜 (β) GdBO3 亚微米级晶体。由于嵌入在研究材料中的 Eu3+ 离子局部配位环境的对称性不同，这两种类型的 GdBO3 的发光特性是不同的。GdBO3:Eu3+ 的晶体结构在高压条件下使用 X 射线衍射进行了研究。研究了单斜相和三斜相的高压发光性能，最高可达约 8 GPa，两种类型的 Eu3+ 掺杂的 GdBO3 晶体不同。对于含有 Eu3+ 离子的两种基质，均显示了发射光谱的变化，例如压缩循环中谱带的展宽和分裂。计算带质心偏移和斯塔克子水平并与压力值的增加相关联。单斜 GdBO3: Eu3+ 中 5D0→7F2 跃迁的 Stark 亚能级的最大位移为 0.25 nm/GPa，三斜 GdBO3: Eu3+ 中 5D0→7F1 跃迁的 Stark 亚能级的最大位移为 0.35 nm/GPa .