Abstract Luminescence down-conversion is an excellent spectral conversion process to minimize the spectral mismatch between the incident solar radiation and the spectral response of a semiconductor (crystalline silicon (c-Si)) solar cells. For this purpose, we are proposing a novel near-infrared emitting Sr5(PO4)3Cl:Eu2+, Nd3+ phosphor prepared by solid state reaction. The prepared material has been characterized by using XRD, photoluminescence excitation (PLE), photoluminescence (PL) and fluorescence decay spectral measurements. The material shows a strong broadband excitation of Eu2+ in the wavelength range of 200–450 nm along with an intense Nd3+ NIR emission around 1000 nm which is favorable for solar spectrum modification. The PLE and PL spectra suggest that sensitization of Nd3+ NIR emission is possible via a strong 4f→5d transition of Eu2+ in Sr5(PO4)3Cl phosphor. We have also investigated the energy-transfer (ET) phenomenon occurring between the sensitizer (Eu2+) and activator (Nd3+) using fluorescence decay measurements. The results suggest that Eu2+-Nd3+ co-doped Sr5(PO4)3Cl phosphor with broad excitation band in the UV-blue region and intense NIR emission around 1 μm is aptly suitable as luminescent down converter useful crystalline silicon (c-Si) solar cells.

中文翻译：

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Sr5(PO4)3Cl:Eu2+, Nd3+ 磷光体中的宽带激发 Nd3+ NIR 发射用于太阳光谱修正

摘要 发光下转换是一种极好的光谱转换过程，可最大限度地减少入射太阳辐射与半导体（晶体硅 (c-Si)）太阳能电池的光谱响应之间的光谱失配。为此，我们提出了一种通过固态反应制备的新型近红外发射 Sr5(PO4)3Cl:Eu2+, Nd3+ 荧光粉。通过使用 XRD、光致发光激发 (PLE)、光致发光 (PL) 和荧光衰减光谱测量对制备的材料进行了表征。该材料在 200-450 nm 的波长范围内显示出强烈的 Eu2+ 宽带激发，以及在 1000 nm 附近的强烈 Nd3+ NIR 发射，这有利于太阳光谱的修改。PLE 和 PL 光谱表明，通过 Sr5(PO4)3Cl 磷光体中 Eu2+ 的强 4f→5d 跃迁，可能会敏化 Nd3+ NIR 发射。我们还使用荧光衰减测量研究了敏化剂 (Eu2+) 和活化剂 (Nd3+) 之间发生的能量转移 (ET) 现象。结果表明，Eu2+-Nd3+ 共掺杂 Sr5(PO4)3Cl 荧光粉在 UV-蓝色区域具有宽激发带和 1 μm 附近的强 NIR 发射，非常适合作为发光下变频器有用的晶体硅 (c-Si) 太阳能电池.