Upconversion Luminescence from Sol-Gel-Derived Erbium- and Ytterbium-Doped BaTiO₃ Film Structures and the Target Form by Nikolai V. Gaponenko, Nikolai I. Staskov, Larisa V. Sudnik, Petr A. Vityaz, Alexei R. Luchanok, Yuliana D. Karnilava, Ekaterina I. Lashkovskaya, Margarita V. Stepikhova, Artem N. Yablonskiy, Vadim D. Zhivulko, Alexander V. Mudryi, Igor L. Martynov, Alexander A. Chistyakov, Nikolai I. Kargin, Vladimir A. Labunov, Yuriy V. Radyush, Eugene B. Chubenko, Victor Yu. Timoshenko

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