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首页> 外文期刊>Advanced Functional Materials >Blue-Green Emission in Terbium-Doped Alumina (Tb:Al_2O_3) Transparent Ceramics
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Blue-Green Emission in Terbium-Doped Alumina (Tb:Al_2O_3) Transparent Ceramics

机译：掺Ter氧化铝（Tb：Al_2O_3）透明陶瓷的蓝绿色发射

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摘要

Alumina (Al_2O_3) is one of the most versatile ceramics, utilized in an amazing range of structural and optical applications. In fact, chromium-doped single crystal Al_2O_3 was the basis for the first laser. Today, most photoluminescent (PL) materials rely on rare earth (RE) rather than transition-metal dopants because RE doping produces greater efficiencies and lower lasing thresholds. RE-doped alumina could provide an extremely versatile PL ceramic, opening the door for a host of new applications and devices. However, producing a transparent RE:Al_2O_3 suitable for PL applications is a major challenge due to the very low equilibrium solubility of RE (～10~(-3)%) in Al_2O_3 in addition to alumina's optical anisotropy. A method is presented here to successfully incorporate Tb~(3+) ions up to a concentration of 0.5 at% into a dense alumina matrix, achieving a transparent light-emitting ceramic. Sub-micrometer alumina and nanometric RE oxide powders are simultaneously densified and reacted using current-activated, pressure-assisted densification (CAPAD), often called spark plasma sintering (SPS). These doped ceramics have a high transmission (～75% at 800 nm) and display PL peaks centered at 485 nm and 543 nm, characteristic of Tb~(3+) emission. Additionally, the luminescent lifetimes are long and compare favorably with lifetimes of other laser ceramics. The high transparencies and PL properties of these ceramics have exciting prospects for high energy laser technology.
机译：氧化铝（Al_2O_3）是用途最广泛的陶瓷之一，广泛用于结构和光学应用。实际上，掺铬单晶Al_2O_3是第一台激光器的基础。如今，大多数光致发光（PL）材料依靠稀土（RE）而不是过渡金属掺杂剂，因为RE掺杂产生更高的效率和更低的激光阈值。掺稀土的氧化铝可以提供用途极为广泛的PL陶瓷，从而为许多新应用和新设备打开了大门。然而，除了氧化铝的光学各向异性之外，由于RE在Al_2O_3中的平衡溶解度非常低（〜10〜（-3）％），因此，制备适合PL应用的透明RE：Al_2O_3是一项重大挑战。本文提出了一种将浓度高达0.5 at％的Tb〜（3+）离子成功掺入致密氧化铝基体中的方法，从而获得透明的发光陶瓷。亚微米级氧化铝和纳米级RE氧化物粉末使用电流激活的压力辅助致密化（CAPAD）同时进行致密化和反应，该过程通常称为火花等离子体烧结（SPS）。这些掺杂的陶瓷具有很高的透射率（在800 nm时约为75％），并在485 nm和543 nm处显示PL峰，这是Tb〜（3+）发射的特征。另外，发光寿命长，并且与其他激光陶瓷的寿命相比具有优势。这些陶瓷的高透明性和PL特性对高能激光技术具有令人兴奋的前景。

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  • 来源
    《Advanced Functional Materials》 |2013年第48期|6036-6043|共8页
  • 作者

    Elias H. Penilla; Yasuhiro Kodera; Javier E. Garay;

  • 作者单位

    Advanced Materials Processing and Synthesis (AMPS) Laboratory Department of Mechanical Engineering, Materials Science and Engineering Program University of California Riverside, CA, 92521, USA;

    Advanced Materials Processing and Synthesis (AMPS) Laboratory Department of Mechanical Engineering, Materials Science and Engineering Program University of California Riverside, CA, 92521, USA;

    Advanced Materials Processing and Synthesis (AMPS) Laboratory Department of Mechanical Engineering, Materials Science and Engineering Program University of California Riverside, CA, 92521, USA;

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