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首页> 美国卫生研究院文献>Nanomaterials >Towards Blue Long-Lasting Luminescence of Eu/Nd-Doped Calcium-Aluminate Nanostructured Platelets via the Molten Salt Route
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Towards Blue Long-Lasting Luminescence of Eu/Nd-Doped Calcium-Aluminate Nanostructured Platelets via the Molten Salt Route

机译：通过熔盐途径朝向Eu / Nd掺杂钙铝酸钙纳米结构血小板的蓝色长持久发光

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摘要

Calcia-alumina binary compounds doped with rare earths and some transition metals cations show persistent luminescence from the visible to the infrared range. Specifically, the blue light can be obtained through the Eu2+ activator center in a potential host, such as dodecacalcium hepta-aluminate (Ca12Al14O33) and monocalcium aluminate (CaAl2O4). By doping with Nd3+, the persistent luminescence can be substantially prolonged; for this reason, the Eu/Nd pair is a potential choice for developing long-lasting blue luminescence. Herein, the phase evolution of the calcia-alumina system via molten salt synthesis is reported as a function of the synthesis temperature and the atmospheric environment. The fraction of CaAl2O4 phase increases when the temperature is higher. Synthesized microparticles of platelet-type morphology represent isolated nanostructured ceramic pieces. Under visible light, the particles are white. This indicates that the followed process solves the dark-gray coloring of phosphor when is synthesized in a reduced atmosphere at high temperature. As regards the synthesis mechanism, which is assisted by the molten flux, the dissolution−diffusion transport process is promoted at the surface of the alumina microparticles. In fact, the emission intensity can be modulated through the phase of the Eu-doped calcium-aluminate discrete platelets synthesized. Consequently, the photoluminescence intensity depends also on the oxidation state of the Eu ion. X-ray absorption near-edge structure and photoluminescence measurements corroborate the Eu reduction and the grain coarsening with the enhancement of the blue emission. The doped phosphors with Eu/Nd show a broad and strong absorption in the region of 320–400 nm and a broad emission band at around 440 nm when they are excited in this absorption range. From a broader perspective, our findings prove that the Ca12Al14O33 and CaAl2O4 phases open new opportunities for research into the design of blue long-lasting emitters for a wide range of fields from ceramic to optoelectronic materials.
机译：煅烧氧化铝二元化合物掺杂有稀土和一些过渡金属阳离子，显示出从红外范围的可见的持续发光。具体地，蓝光可以通过潜在宿主中的Eu2 +活化剂中心获得，例如十二次磷酸庚烷（Ca12Al14O33）和单钙（CaAL2O4）。通过掺杂ND3 +，持续发光可以基本上延长;因此，EU / ND对是开发持久的蓝色发光的潜在选择。这里，通过熔盐合成的氧化钙 - 氧化铝系统的相位演化作为合成温度和大气环境的函数报告。当温度较高时CaA12O4相的级分增加。血小板型形态的合成微粒代表分离的纳米结构陶瓷件。在可见光下，颗粒是白色的。这表明遵循的过程解决了在高温下在降低的气氛中合成时磷光体的深灰色着色。关于通过熔融通量辅助的合成机制，在氧化铝微粒的表面促进溶解扩散传输过程。实际上，可以通过合成的欧富钙铝酸钙离散血小板的相位调节发射强度。因此，光致发光强度也取决于EU离子的氧化状态。 X射线吸收近边缘结构和光致发光测量证实了欧盟还原和晶粒粗糙度随着蓝色排放的增强。具有EU / ND的掺杂磷光体在320-400nm的区域中显示出宽而强烈的吸收，并且当在该吸收范围内激发时，在440nm的范围内的宽度发射带。从更广泛的角度来看，我们的调查结果证明了CA12AL14O33和CAAL2O4阶段为研究蓝色长持久发射器的设计开辟了新的机会，从陶瓷到光电材料的各种领域。

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