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An efficient near-infrared (NIR) phosphor LiSrPO4:Eu2+, Pr3+ is synthesized by solid-state reaction and systematically investigated using xray diffraction, diffuse reflection spectrum, photoluminescence spectra at room temperature and 3 K, and the decay curves. The UV-Vis-NIR energy transfer mechanism is proposed based on these results. The results demonstrate Eu2+ can be an efficient sensitizer for harvesting UV photon and greatly enhancing the NIR emission of Pr3+ between 960 and 1060 nm through efficient energy feeding by allowed 4f-5d absorption of Eu2+ with high oscillator strength. Eu2+/Pr3+ may be an efficient donor-acceptor pair as solar spectral converter for Si solar cells.



This paper was published in [Optics Express] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: []. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. ©2013 Optical Society of America.