UV photon harvesting and enhanced near-infrared emission in novel quantum cutting Ca2BO3Cl:Ce3+,Tb3+,Yb3+ phosphor
UV photon harvesting and enhanced near-infrared emission in novel quantum cutting Ca2BO3Cl:Ce3+,Tb3+,Yb3+ phosphor
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DOI：
10.1039/b906954b
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发表时间：
2009-09
影响因子：
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通讯作者：
Qiuhong Zhang;Jing Wang;Gong-guo Zhang;Q. Su
中科院分区：
文献类型：
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作者：
Qiuhong Zhang;Jing Wang;Gong-guo Zhang;Q. Su
研制了一种新型的近红外量子切割(QC)发光材料Ca2BO3Cl：Ce3+，Tb3+，Yb3+。它可以捕获紫外光光子，并在∼1000 nm附近显示出强烈的Yb3+近红外发射，与硅太阳能电池的最大光谱响应完美匹配。Ce~(3+)离子在288、315和369 nm宽带激发下，Ca2BO3Cl：Ce~(3+)、Tb~(3+)、Yb~(3+)的近红外发射强度分别是GdBO_3：Tb~(3+)、Yb~(3+)的9.1、10和2.8倍，最高的近红外量子效率约为182%。首次证明了Ce~(3+)离子是一种高效的增敏剂，它利用高振子强度的Ce~(3+)离子被允许的4f-5d吸收有效地馈入能量，从而捕获紫外光并极大地增强Yb3+离子的近红外发射。我们相信，这种新的近红外QC荧光粉可能会为设计先进的NIR QC荧光粉开辟一条新的途径，以最大限度地提高硅太阳能电池的LSC性能。
A novel near-infrared (NIR) quantum cutting (QC) Ca2BO3Cl:Ce3+,Tb3+,Yb3+ phosphor promising for luminescent solar concentrators (LSC) with Si solar cells was successfully developed. It can harvest UV photons and exhibits an intense NIR emission of Yb3+ around ∼1000 nm, perfectly matching the maximum spectral response of Si solar cells. The NIR emission intensity of Ca2BO3Cl:Ce3+,Tb3+,Yb3+ upon broadband excitation of Ce3+ ion at 288, 315 and 369 nm is about 9.1, 10 and 2.8 times as intense as that of GdBO3:Tb3+,Yb3+ with the highest NIR quantum efficiency of about 182% upon narrow excitation of Tb3+ ion at 488 nm. It demonstrates for the first time that Ce3+ ion can be an efficient sensitizer harvesting UV photons and greatly enhancing the NIR emission of Yb3+ ion through efficient energy feeding by the allowed 4f–5d absorption of Ce3+ ion with high oscillator strength. We believe this new NIR QC phosphor may open a new route to the design of advanced NIR QC phosphors for maximizing LSC performance with Si solar cells.