Determination of the refractive index of β-NaYF 4/Yb 3+/Er 3+/Tm 3+ nanocrystals using spectroscopic refractometry

V. I. Sokolov, A. V. Zvyagin, S. M. Igumnov, S. I. Molchanova, M. M. Nazarov, A. V. Nechaev, A. G. Savelyev, A. A. Tyutyunov, E. V. Khaydukov, V. Ya Panchenko

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36 Citations (Scopus)


A method for measuring refractive index n of nanosize particles in the visible and near-IR spectral ranges is proposed. The method is based on comparing refractive index ncolloid of a colloid solution of nanoparticles in several solvents with refractive indices nsolvent of corresponding pure solvents and has an accuracy of ±2 × 10−4. Upconversion nanosize phosphors (UCNPs) are synthesized in the form of a β-NaYF4 crystalline matrix doped with Yb3+, Er3+, and Tm3+ rare earth ions. UCNPs have a doped core with a diameter of 40 ± 5 nm and undoped shell with a thickness of 3–5 nm. Synthesized nanocrystals possess intense photoluminescence in the blue, green, and red spectral ranges upon excitation by IR radiation with a wavelength of 977 nm. Using a spectroscopic refractometer, the dispersion of the refractive index of β-NaYF4/Yb3+/Er3+/Tm3+ nanocrystals was measured for the first time in the spectral range of 450–1000 nm with an accuracy of ±2 × 10−4.

Original languageEnglish
Pages (from-to)609-613
Number of pages5
JournalOptics and Spectroscopy (English translation of Optika i Spektroskopiya)
Issue number4
Publication statusPublished - 1 Apr 2015
Externally publishedYes


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