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Gehlenite:Eu~(3+) phosphors from a silicone resin and nano-sized fillers

机译：硅树脂：Eu〜（3+）磷光体和纳米填料

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摘要

Gehlenite (Ca_2Al_2SiO_7) ceramics have been successfully prepared by a novel approach, consisting of the heat treatment of a silicone resin embedding CaO and Al_2O_3 precursors, in the form of nano-sized particles that act as reactive fillers. Luminescence was due to the use of nano-sized Eu_2O_3 as secondary additive, particularly adopting a charge compensation formulation, i.e. Ca_(2-2x)Eu_(2x)Al(Al_(1+2x)Si_(1-2x)O_7), with x = 0.07. The phase development and the emission characteristics could be adjusted by simply changing the thermal treatment applied to powders of silicone/fillers mixtures. While conventional firing at 1300 ℃ (for 1 h) led to practically phase-pure crystalline Eu-doped gehlenite, exhibiting a strong red luminescence, flame synthesis yielded amorphous powders, exhibiting an emission in a much broader range. When excited at 394 nm both gehlenite glass and polycrystalline gehlenite emitted light, which CIE chromaticity coordinates were found to be (x = 0.65, y = 0.35), indicating that both systems are good candidates for red light emitting phosphors.
机译：已经通过一种新颖的方法成功地制备了h石（Ca_2Al_2SiO_7）陶瓷，该方法包括对嵌入有CaO和Al_2O_3前体的有机硅树脂进行热处理，其形式为充当活性填料的纳米级颗粒。发光是由于使用了纳米级Eu_2O_3作为辅助添加剂，特别是采用了电荷补偿配方，即Ca_（2-2x）Eu_（2x）Al（Al_（1 + 2x）Si_（1-2x）O_7）， x = 0.07。可以通过简单地改变应用于有机硅/填料混合物粉末的热处理来调节相发展和发射特性。在1300℃（1小时）的常规烧成过程中，产生了几乎呈相纯的Eu掺杂的菱沸石，显示出很强的红色发光，而火焰合成生成的非晶态粉末，其发射范围更广。当在394 nm处激发时，钠长晶石玻璃和多晶钠长晶石均发射出光，其CIE色度坐标为（x = 0.65，y = 0.35），表明这两种系统都是红色发光磷光体的良好候选者。

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