Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 1: Optical properties of thin films I
DS 1.2: Vortrag
Montag, 27. März 2006, 09:45–10:00, GER 37
Optical properties of oxide films heavily doped with Ytterbium ions — •Georgiy Malashkevich1, Oksana Chukova2, Volodymyr Degoda2, Sergiy Nedilko2, and Sergiy Yablochkov2 — 1Institute of Molecular and Atomic Physics of BAS, 68, Skarini Ave., Minsk, Belarus — 2Kyiv National Taras Shevchenko University, 2, block 1, acad. Hlushkov Ave., 03680, Kyiv, Ukraine
The films doped with ytterbium ions can find application in quantum electronics, e.g. as materials for UV- and near IR planar lasers, in scintillation technique as fast detectors of ionising radiations, including detection of neutrinos, etc.
The ytterbium ions are characterized by quasi-absence of cross-relaxation. Efficiency of the Yb3+ ions inner emission from 2F5/2 level and charge transfer luminescence are determined by nonradiation and radiation excitation, energy transfer from charge transfer state to the 2F5/2 level of the Yb3+, by rate of direct inner excitation and transfer of excitation from electron-hole pairs created under high energy excitation, as well as by cooperative processes and formation of paired centers.
The spectral-luminescent properties and processes of intra-center excitations transfer in CeO2H:Yb oxide nanoparticles and complicated [FeO6]:Yb centers in the nano-structured films created by the selection the redox conditions and buffer elements have been investigated. The noble metals (Ag0, Au0 and Pt0) nanoparticles with different sizes and shapes in the films have been formed and their influence on hysteretic behaviour of cooperative luminescence from pairs of the Yb3+ ions was investigated. This work is supported by STCU Project 2042.