Standard Of Up-Conversion Luminescence Based On Single Crystals Of Alcaline Earth Fluorides Doped With Ytterbium And Erbium/Thulium/Holmium
Up-conversion fluoride powder luminophores with different morphology and core-shell architecture have great interest for bioimaging, plastic sorting, increasing efficiency of solar cells, anti-counterfeiting, thermometry, vacuummetry, and biophotonics. Measurements of absolute photoluminescence quantum yield in an integrating sphere (A-PLQY) for dispersions or particles are very complicated task. One of the solutions is the registration of relative photoluminescence quantum yield (R-PLQY) without an integrating sphere by means of luminescence standard. The ideal object for the luminescence standard is a single crystal that has a maximum volume to surface ratio.
The goal of the study is the determination of single crystal composition with the highest A-PLQY and its examination as the standard of up-conversion luminescence.
The single crystals of binary and ternary solid solutions (MF2:Yb:R, M=Ca, Sr, Ba, Pb; R = Tm, Ho, Er) were grown by the Bridgman technique in a vacuum furnace with CF4 fluorinating atmosphere. The compositions with highest value of up-conversion quantum yields were determined.
The optimized single crystals were succulently testified as standard materials for determination of nanoparticle R-PLQY.
Acknowledgment: The reported study was funded by RFBR (project number 21-53-12017 for S.V.K., V.A.K., A.A.A., A.N.N., V.V.V.).
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Prokhorov General Physics Institute of the Russian Academy of Sciences