Donor Centers Involved into the Quantum Cutting in Ytterbium-Doped Scheelite‐Like Crystals

Year: 2019

Authors: Subbotin K.A., Titov A.I., Lis D.A., Sani E., Smirnov V.A., Alimov O.K., Zharikov E.V., Shcherbakov, I.A.

Autors Affiliation: Laser Materials and Technology Research Centre Prokhorov General Physics Institute of Russian Academy of Sciences
Vavilova str. 38, Moscow 119991, Russia; Department of Chemistry and Technology for Crystals Mendeleev University of Chemical Technology of Russia Miusskaya sq. 9, Moscow 125048, Russia; CNR-INO National Institute of Applied Optics
Largo E. Fermi 6, Firenze 50125, Italy

Abstract: Yb-doped Scheelite-like molybdate and tungstate single crystals are promising quantum-cutting materials. The cooperative downconversion from donor centers to Yb ions occurs in heavily Yb-doped crystals of this family. This phenomenon can substantially raise the efficiency of crystalline silicon photovoltaic cells. However, the nature of donor centers is still unknown. Herein, several versions of this nature are tested and discussed: Yb3þ ion (its high-energy charge transfer states); Yb2þ ion; self-trapped exciton at molybdate/tungstate complex; color centers based on oxygen vacancies; accidental impurities. To test these assumptions, a series of Scheelite-like molybdate and tungstate single crystals (CaMoO4, CaWO4, NaLa(MoO4)2, NaGd(MoO4)2, NaGd(WO4)2, and NaY1xGdx(WO4)2) are grown, both undoped and doped with different Ybconcentrations. The complex spectroscopic investigations of these crystals are performed. As a result of the studies, three versions, self-trapped excitons at [MoO4]/[WO4] complexes, color centers at oxygen vacancies, and accidental impurities, coming into the crystals with MoO3, are rejected. The applicability ofthe other versions should be refined.

Journal/Review: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE

Volume: 217 (4)      Pages from: 1900659  to: 1900659

More Information: This work was supported by Russian Fund for Basic Research (grant no. 17-02-01245), and by the Presidium of RAS (Program I.7 “Modern problems of photonics, the probing of inhomogeneous media and materials”).
KeyWords: quantum cutting, Scheelites, ytterbium
DOI: 10.1002/pssa.201900659

Citations: 7
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