Luo Xiaobing, Shen Jun, Huang He, Xu Lu, Wang Zhixiang, Chen Yang, Li Li
J Nanosci Nanotechnol. 2016 Apr;16(4):3494-9. doi: 10.1166/jnn.2016.11801.
Efficient near-infrared (NIR) quantum cutting (QC) has been demonstrated in Yb3+ doped SrMoO4 phosphors synthesized by the high-temperature solid-state reaction method. The obtained SrMoO4:Yb3+ phosphors were characterized by X-ray diffraction (XRD), diffuse reflectance spectra, photoluminescence (PL) spectra and decay lifetime to understand the observed near-infrared quantum cutting phenomena. The XRD results show that all the prepared phosphors can be readily indexed to the pure tetragonal phase of SrMoO4 and exhibit good crystallinity. The experimental results showed that the strong visible molybdate (MoO2-(4)) emission around 493 nm and near-infrared (NIR) emission around 1000 nm from Yb3+(2F(5/2)-->2F(7/2)) of SrMoO4:Yb3+ phosphors were observed under ultraviolet (290 nm) excitation. The Yb + concentration dependence of luminescent properties and lifetimes of both the visible and NIR emissions have also been investigated. The quenching concentration of Yb3+ ions approaches as high as 10 mol%. The cooperative energy transfer (CET) mechanism was also discussed in detail. The broadband NIR QC phosphors may possibly have potential application in enhancing the conversion efficiency of solar cells.
通过高温固态反应法合成的Yb3+掺杂SrMoO4荧光粉中已证明了高效近红外（NIR）量子剪裁（QC）。通过X射线衍射（XRD）、漫反射光谱、光致发光（PL）光谱和衰减寿命对获得的SrMoO4:Yb3+荧光粉进行了表征，以了解观察到的近红外量子剪裁现象。XRD结果表明，所有制备的荧光粉都可以很容易地索引到SrMoO4的纯四方相，并且具有良好的结晶度。实验结果表明，在紫外光（290nm）激发下，观察到了SrMoO4:Yb3+荧光粉在493nm附近强烈的可见钼酸盐（MoO2-(4)）发射和在1000nm附近的近红外（NIR）发射，这是Yb3+(2F(5/2)-->2F(7/2))产生的。还研究了Yb+浓度对可见和近红外发射的发光性质和寿命的影响。Yb3+离子的猝灭浓度高达10mol%。还详细讨论了合作能量转移（CET）机制。宽带近红外量子剪裁荧光粉可能在提高太阳能电池的转换效率方面具有潜在应用。
