Yb³⁺ site occupation and host sensitization luminescence of a novel near‐infrared emitting Sr₂CaMoO₆:Yb³⁺ phosphor

Abstract

The host sensitized near‐infrared (NIR) emitting phosphor Sr2CaMoO6:Yb3+ was fabricated by the solid state reaction method. The structural refinement and Raman spectra elucidate that Yb3+ ions preferentially occupy Ca2+ sites. The phosphor can harvest ultraviolet (UV)–blue photons and exhibits intense NIR emission at around 1012 nm with full‐width‐at‐half‐maximum of 1635 cm–1. Moreover, the absolute NIR photoluminesence quantum yield (PLQY) is estimated to be about 9%. The Sr2CaMoO6:Yb3+ phosphor may be a promising luminescence downshifting material for improving the spectral response of solar cells in the UV region. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Communication—An Intense Broadband Sensitized Near-Infrared Emitting GdAl3(BO3)4:Ce3+,Yb3+ Phosphor

“…Solar spectral by downconversion (DC) of one ultraviolet-visible (UV-Vis) photon with high energy into two or more near-infrared (NIR) photons with low energy has been proposed as a potential route to overcome the spectral mismatch for solar cells. [4][5][6][7][8][9][10] The GAB:RE 3+ , Yb 3+ (RE = Pr, Tb, and Tm) as efficient nearinfrared quantum cutting (QC) phosphors been reported by Q.Y Zhang, the conversion of the visible photon from RE 3+ (RE = Pr, Tb, and Tm) into the NIR of Yb 3+ emission with the optimal QE approaching 200%. 11,12 However, these NIR materials are still far from practical application because of their narrow excitation band with low excitation efficiency.…”