STANDARD OF UP-CONVERSION LUMINESCENCE BASED ON BARIUM FLUORIDE DOPED YTTERBIUM AND ERBIUM
S.V. Kuznetsov1, E.I. Madirov2,3, V.A. Konyushkin1, A.N. Nakladov1, Thomas Bergfeldt4, D.Busko3, H.B. Nasrabadi3, D. Hudry3, I.A. Howard3, B.S. Richards3, A. Turshatov3
1Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia.
2Kazan Federal University, Kazan, Russia.
3Institute of Microstructure Technology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
4Institute for Applied Materials, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
Abstract
Up-conversion luminescence based on the conversion of near-infrared radiation to the visible spectral range has great interest due to applications in biophotonics, thermometry, anti-counterfeiting, and increasing efficiency of solar cells. The implementation of up-conversion nanoluminophores for practical application needs to estimate the luminescence efficiency for nanoparticles with different morphology and core-shell architecture. Measurements of absolute photoluminescence quantum yield in an integrating sphere (A-PLQY) for dispersions or particles are needed but they very difficult. One of the solutions has the determination of relative photoluminescence quantum yield (R-PLQY) in an integrating sphere using luminescence standard. The ideal object for the luminescence standard has a single crystal that has a maximum volume to surface ratio.
The goal of the study was the determination of single crystal composition with the highest A-PLQY and testifying it as the standard of up-conversion luminescence.
The BaF2:Yb: Er single crystals were grown by the Bridgman technique in a vacuum furnace with CF4 fluorinating atmosphere. The core/shell β-NaYF4:Yb,Er@NaYF4 with hexagonal crystal structure nanoparticles were synthesized by the solvothermal technique.
The BaF2:Yb (15.0 mol.%): Er (2.0 mol.%) single crystals exhibited A-PLQY=0.90±0.06% at 3 W/cm2 excitation. This crystal as the reference material allowed the estimation of R-PLQY=0.06±0.01 at 3W/cm2 excitation for core/shell β-NaYF4:Yb,Er@NaYF4 nanoparticles which coincided with value for the same nanoparticles determined using the absolute method (0.0500.002% at 3W/cm2 excitation).
Acknowledgment: The reported study was funded by RFBR (project number 21-53-12017 for S.V.K., V.A.K., and A.N.N.) and DFG (project number TU 487/8-1 for A.T. and B.S.R.).
Speaker
Sergey Kuznetsov
Prokhorov General Physics Institute of the Russian Academy of Sciences
Russia
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