A new rare‐earth borate Er₆B₄O₁₅ was synthesized by a solid‐state reaction technique. The crystal was obtained by a flux method. Single‐crystal X‐ray diffraction analysis revealed that the crystal structure is composed of ErO₆ polyhedra sharing edges and BO₃ groups. The absorption, near‐infrared fluorescence spectra and the fluorescence decay curve of Er: ⁴I_13/2 energy level in the Er₆B₄O₁₅ crystal were measured at room temperature. The absorption peak was located at 977 nm with absorption cross section of 1.16 × 10⁻²¹ cm² and a full width at half‐maximum (FWHM) of 16 nm, which is very suitable for commercial 980 nm laser diode pumping. A maximum emission peak at 1560 mm with a broad FWHM of 64 nm was observed in this crystal because of the Er³⁺ transition ⁴I_13/2→⁴I_15/2, while the emission cross section was calculated to be 8.53 × 10⁻²⁰ cm². These results imply that the Er₆B₄O₁₅ crystal is a promising candidate material for the achievement of an eye‐safe near‐infrared wavelength laser.

中文翻译：

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Er6B4O15的晶体生长，结构和表征为近红外波段内的自激活人眼安全激光材料。

通过固相反应技术合成了一种新的稀土硼酸盐Er ₆ B ₄ O ₁₅。通过熔剂法获得晶体。X射线单晶衍射分析表明，晶体结构由共享边和BO ₃基的ErO ₆多面体组成。在室温下测量了Er ₆ B ₄ O ₁₅晶体中Er：⁴ I _13/2能级的吸收，近红外荧光光谱和荧光衰减曲线。吸收峰位于977 nm处，吸收截面为1.16×10 ^-21  cm ^2。半峰全宽（FWHM）为16 nm，非常适合商业980 nm激光二极管泵浦。在这种晶体由于铒的观察1560毫米，64纳米的宽FWHM的最大发射峰³⁺过渡⁴我_13/2 → ⁴我_15/2，而发射截面计算为8.53×10 ⁻²⁰  cm ²。这些结果表明，Er ₆ B ₄ O ₁₅晶体是实现人眼安全的近红外波长激光的有希望的候选材料。