Er(3+)-doped transparent glass ceramics containing micron-sized SrF2 crystals for 2.7 μm emissions.
Er(3+)-doped transparent glass ceramics containing micron-sized SrF2 crystals for 2.7 μm emissions.
复制标题
含有微米级 SrF2 晶体的 Er3 掺杂透明玻璃陶瓷，发射量为 2.7 μm
DOI：
10.1038/srep29873
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发表时间：
2016-07-19
影响因子：
4.6
通讯作者：
Zhang L
中科院分区：
文献类型：
--
作者：
Jiang Y;Fan J;Jiang B;Mao X;Tang J;Xu Y;Dai S;Zhang L
将氟化锶和前驱体玻璃粉末混合，在820 °C下直接液相烧成15 min，得到了含微米级氟化锶晶体的掺Er~(3+)透明微晶玻璃。用X射线衍射仪、场发射扫描电子显微镜和透射电子显微镜研究了微晶玻璃中SrF2晶体的形貌和微观结构的演变。SrF_2晶体尺寸约15 μm，均匀分布在氟磷酸盐玻璃基质中。该微晶玻璃在可见光区域的平均透过率为75%，在近红外区域的平均透过率在85%以上。微晶玻璃的高透过率是由于SRF2的折射率与前驱体玻璃的折射率匹配所致。能量色散光谱、光致发光光谱和光致发光寿命证实了Er3+在微米级的SrF2晶体中的掺入。用半导体激光器在980 μnm激发下，观察到了由4I11/2 → 4I13/2跃迁引起的2.7 m强发射。Er~(3+)在2.7 μm附近的发射截面最大值大于1.2 × 10−20 cm~2，这表明含微米级SrF_2晶体的透明微晶玻璃有可能用于高效率的2.7 μm激光器和放大器。
Er3+-doped transparent glass ceramics containing micron-sized SrF2 crystals were obtained by direct liquid-phase sintering of a mixture of SrF2 powders and precursor glass powders at 820 °C for 15 min. The appearance and microstructural evolution of the SrF2 crystals in the resulting glass ceramics were investigated using X-ray diffraction, field-emission scanning electron microscopy and transmission microscopy. The SrF2 crystals are ~15 μm in size and are uniformly distributed throughout the fluorophosphate glass matrix. The glass ceramics achieve an average transmittance of 75% in the visible region and more than 85% in the near-IR region. The high transmittance of the glass ceramics results from matching the refractive index of the SrF2 with that of the precursor glass. Energy dispersive spectroscopy, photoluminescence spectra, and photoluminescence lifetimes verified the incorporation of Er3+ into the micron-sized SrF2 crystals. Intense 2.7 μm emissions due to the 4I11/2 → 4I13/2 transition were observed upon excitation at 980 nm using a laser diode. The maximum value of the emission cross section of Er3+ around 2.7 μm is more than 1.2 × 10−20 cm2, which indicates the potential of using transparent glass ceramics containing micron-sized SrF2 crystals for efficient 2.7 μm lasers and amplifiers.