The trivalent ytterbium (Yb) ion has been extensively used as an emitter in short-wave infrared (SWIR) lasers, a sensitizer to activate other lanthanide ions for up-conversion luminescence, and a spectral converter in Ln-Yb doubly doped quantum cutting phosphors. Here we report a new function of the Yb ion-as an efficient emitting center for SWIR persistent luminescence. We have developed the first real SWIR persistent phosphor, MgGeO:Yb, which exhibits very-long persistent luminescence at around 1000 nm for longer than 100 h. The MgGeO:Yb phosphor is spectrally transparent to visible/near-infrared light (~400-900 nm) and is a promising ultraviolet-to-SWIR spectral convertor. The MgGeO:Yb phosphor also exhibits a photostimulated persistent luminescence capability, where the SWIR persistent emission in an ultraviolet-light pre-irradiated sample can be rejuvenated by low-energy light (white or red light) stimulation. The MgGeO:Yb phosphor is expected to have promising applications in biomedical imaging, night-vision surveillance and photovoltaics.
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| http://dx.doi.org/10.1038/lsa.2016.124 | DOI Listing |
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