ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 59, (2) 164 - 168 (2015)


INFLUENCE OF PREPARATION CONDITIONS ON THE MICROSTRUCTURE AND OPTICAL PROPERTIES OF LiNbO₃ THIN FILMS
 
Mikolášová Dana 1, Rubešová Kateřina 1, Hlásek Tomáš 1, Jakeš Vít 1, Oswald Jiří 2, Remsa Jan 3
 
1 Department of Inorganic Chemistry, University of Chemistry and Technology, Technická 5, Prague 6 166 28, Czech Republic
2 Institute of Physics, the Academy of Sciences of the Czech Republic, Cukrovarnická 10, Prague 6 162 00, Czech Republic
3 Institute of Physics, the Academy of Sciences of the Czech Republic, Na Slovance 2, Prague 8 18221, Czech Republic

Keywords: Lithium niobate, Thin film, Sol-gel, Rapid annealing
 

Thin films of Er³⁺/Yb³⁺: LiNbO₃ were deposited on sapphire (0001) substrates using a spin-coating process. A deposited solution was prepared by a non-aqueous sol-gel method using 2-methoxyethanol, metallic lithium, niobium(V) ethoxide and erbium and ytterbium acetates. Two starting compositions of LiNbO₃ solution (1:1 or congruent) were tested in order to minimize the present of secondary (Er/Yb)NbO₄ phases. The effect of different temperature (800°C or 1000°C) and different used atmosphere (air or oxygen) during the films crystallization was also investigated. Rapid annealing (at 1150°C with the heating rate 55°C.s⁻¹) was also tested and its influence on secondary phases crystallinity and luminescence of Er³⁺/Yb³⁺: LiNbO₃ was established. The thin films were characterized by X-ray diffraction analysis, scanning electron microscopy and photoluminescence spectroscopy.


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