Tunable multicolor and enhanced red emission of monodisperse CaF2:Yb3+/Ho3+ microspheres via Mn2+ doping

Tunable multicolor and enhanced red emission of monodisperse CaF2:Yb3+/Ho3+ microspheres via Mn2+ doping
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通过 Mn2 掺杂实现单分散 CaF2:Yb3 /Ho3 微球的可调多色和增强红光发射

DOI:
10.1016/j.optmat.2018.03.048
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发表时间:
2018-05
期刊:
影响因子:
3.9
通讯作者:
Xu Xiaojun
Xu Xiaojun
中科院分区:
材料科学3区
文献类型:
--
作者:
Wang Rui;Yuan Maohui;Zhang Chaofan;Wang Hongyan;Xu Xiaojun

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过渡金属离子(如Mn ~(2+))和镧系元素共掺杂的上转换(UC)材料因其在OLED显示中的应用前景,近年来受到了广泛的关注。本文报道了Mn ~(2+)掺杂的单分散CaF_2:Yb ~(3+)/Ho ~(3+)微球的水热合成及表征。X射线衍射(XRD)结果表明,Mn 2+掺杂并没有改变CaF 2材料的立方相,但由于较小的Mn 2+取代了较大的Ca 2+,导致衍射峰略微向高角度移动。在980 nm连续波(CW)激光的激发下,Mn 2+浓度从0增加到30 mol%时,微球呈现绿-黄-红调谐色,红/绿色比(R/G)和红/蓝比(R/B)显著增加。Ho 3+和Mn 2+之间的能量迁移过程提出和支持的Ho 3 +UC发射的时间衰减和功率依赖性测量。这些上转换材料在光学器件、彩色显示、纳米激光器和生物医学成像等方面具有潜在的应用前景。
Transition metal ions (e.g. Mn2+) and lanthanide co-doped upconversion (UC) materials have attracted wide attention in recent years due to their promising application in multicolor display. Here, we report the hydrothermal synthesis and characterization of Mn2+doped monodisperse CaF2:Yb3+/Ho3+microspheres. The results of X-ray diffraction (XRD) revealed that Mn2+doping does not change the cubic phase of CaF2material but will lead to diffraction peaks shifting slightly towards higher angle due to the substitution of larger Ca2+by the relatively smaller Mn2+. Under the excitation of 980 nm continuous wave (CW) laser, these microspheres exhibit green-yellow-red tuning colors and remarkable enhancement of both red to green ratio (R/G) and red to blue ratio (R/B) when increasing Mn2+concentration from 0 to 30 mol%. The energy migration process between Ho3+and Mn2+was proposed and supported by time-decay and power dependence measurements of Ho3+UC emission. These upconversion materials may have potential applications in optical devices, color display, nanoscale lasers and biomedical imaging.
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