Lanthanide-doped down-conversion fluorides: synthesis, characterization, and applications

Darayas N. Patel; Sergey S. Sarkisov; Abdalla M. Darwish; Aminaa Jallow; Kaiana Lewis; Dedrian Barrett; Andrew Dholichand; Mike Warren Jr.; Kayla McEady

doi:10.1117/12.2577886

5 March 2021 Lanthanide-doped down-conversion fluorides: synthesis, characterization, and applications

Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Aminaa Jallow, Kaiana Lewis, Dedrian Barrett, Andrew Dholichand, Mike Warren Jr., Kayla McEady

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Proceedings Volume 11687, Oxide-based Materials and Devices XII; 1168727 (2021) https://doi.org/10.1117/12.2577886
Event: SPIE OPTO, 2021, Online Only

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Abstract

Down-conversion phosphors based on ions of lanthanides can be used to convert UV/blue components of solar spectrum in near-infrared radiation more suitable for conventional silicon photovoltaic (PV) cells. Comparing to other down convertors, their advantages are long Stokes shift (>300 nm) excluding re-absorption, and environment safety. However, down-conversion efficiency remains an issue. The paper reports on synthesis and characterization of down-conversion phosphor based on lanthanide-doped fluoride NaYF₄:Yb³⁺, Er³⁺. The phosphor was synthesized using inexpensive wet method and further baked at ~500°C for 1 h to convert NaYF₄ matrix from cubic to hexagonal phase. The obtained micro-powder was ball-milled to nano-powder. The phosphor demonstrated down-conversion radiation from 830 to 1100 nm attributed to Yb³⁺. The Stokes shift was ~600 nm. The intensity of NIR peak radiation increased three times with increasing concentration of Yb³⁺ from 3 to 14%. A thin-sheet down-convertor of a Luminescent Solar Concentrator (LSC) was made in the form of a projector Mylar transparency coated with nanocolloid of the phosphor in a solution of polymer PMMA in chlorobenzene. Such thin sheet improved by 15% the PV power produced by the LSC being illuminated with a solar simulator as compared to an incandescent light bulb. The obtained results can be used in building more efficient PV green power.

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Darayas N. Patel, Sergey S. Sarkisov, Abdalla M. Darwish, Aminaa Jallow, Kaiana Lewis, Dedrian Barrett, Andrew Dholichand, Mike Warren Jr., and Kayla McEady "Lanthanide-doped down-conversion fluorides: synthesis, characterization, and applications", Proc. SPIE 11687, Oxide-based Materials and Devices XII, 1168727 (5 March 2021); https://doi.org/10.1117/12.2577886

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