S.A. Burikov, E.A. Filippova, A.A. Fedyanina, S.V. Kuznetsov, V.Yu. Proydakova, V.V. Voronov, T.A. Dolenko. Influence of the intensity of exciting radiation on the luminescent properties of nanopowders NaYF4:Yb/Tm. Optics and Spectroscopy, 2022, Vol. 130, No. 6, p.655-662. DOI:10.21883/EOS.2022.06.54700.38-22