Kaczmarek Anna M, Ndagsi Dorine, Van Deun Rik
L3, Luminescent Lanthanide Lab, Department of Inorganic and Physical Chemistry, Ghent University, Krijgslaan 281-S3, B-9000 Ghent, Belgium.
Dalton Trans. 2016 Oct 18;45(41):16231-16239. doi: 10.1039/c6dt02347a.
In this study, we investigated the dopant and excitation wavelength color tunability of several Dy:YVO and Dy/Eu:YVO samples with the aim of obtaining white light emission. The materials were prepared in a hydrothermal synthesis in the presence of glycerol and resulted in microsized particles. Although white light can be obtained through choosing an appropriate doping percentage of Dy in this material, yet by co-doping appropriate amounts of Dy and Eu into the YVO matrix a warmer tone of white light (with yellow under tone) can be achieved. Despite the fact that both the as obtained and heat treated materials were of the pure YVO phase when doped they showed differences in their luminescence properties. We show that also by adjusting the excitation wavelength slight changes in the emitted color of the doped and co-doped materials can be obtained. Additionally a detailed analysis of the Dy/Eu:YVO co-doped samples revealed that energy is not transferred from the V-O charge transfer band independently to both Eu and Dy instead a V-O → Dy → Eu energy transfer takes place. A nonradiative energy transfer between the Dy and Eu ions is proposed.
在本研究中，我们研究了几种Dy:YVO和Dy/Eu:YVO样品的掺杂剂和激发波长颜色可调性，目的是获得白光发射。这些材料是在甘油存在下通过水热合成制备的，得到了微米级颗粒。虽然通过在这种材料中选择合适的Dy掺杂百分比可以获得白光，但通过将适量的Dy和Eu共掺杂到YVO基质中，可以实现更暖色调的白光（带有黄色底色）。尽管所获得的材料和热处理后的材料在掺杂时均为纯YVO相，但它们的发光特性存在差异。我们表明，通过调整激发波长，也可以使掺杂和共掺杂材料的发射颜色发生轻微变化。此外，对Dy/Eu:YVO共掺杂样品的详细分析表明，能量并非从V-O电荷转移带独立地转移到Eu和Dy，而是发生了V-O→Dy→Eu的能量转移。提出了Dy和Eu离子之间的非辐射能量转移。
