Yb-doped double tungstates for down-conversion applications
Authors: Sani E., Brugionic A., Mercatelli L., Parisi D., Zharikovc E.V., Lisc D.A., Subbotin K.A.
Autors Affiliation: – NEST Istituto Nanoscienze-CNR and Dipartimento di Fisica dell’Università di Pisa, Largo B. Pontecorvo 3, 56127, Pisa, Italy –
– Prokhorov General Physics Institute of Russian Academy of Sciences, Vavilova st. 38, Moscow, 119991, Russia
– Mendeleev University of Chemical Technology of Russia, Miusskaya Square, 9, Moscow, 125047, Russia
Abstract: The paper discusses the potential of several Yb-doped scheelite-like double tungstate crystals for sunlight downconversion. Four hosts NaY(WO4)2, NaY1/2Gd1/2(WO4)2, NaY2/3Gd1/3(WO4)2, and NaY(Mo1/2W1/2O4)2 with the same 10% at. Yb doping level were comparatively investigated. Besides that, the eﬀect of increase the Yb concentration from 10at.% to 15at.% was checked in case of NaY(WO4)2 crystal host. The eﬃcient ytterbium 900-nm broadband emission was obtained under ultraviolet excitation, despite the absence of Yb absorption linesinthis range.Thishappens dueto non-radiative energy transferfromdonorcenters ofthe hoststo Ybactive ions. This absorption wavelengths range of the host can be tuned by changing the crystal chemical composition. The obtained results indicate that the family of Yb-doped scheelite-like double tungstates is a suitable candidate for developing down-converter materials for solar energy applications.
Journal/Review: OPTICAL MATERIALS
Volume: 94 Pages from: 415 to: 422
KeyWords: Sunlight down-conversion, Photovoltaics, Ytterbium, Coatings, Glass-ceramics