Institute for Single Crystals of NAS Ukraine

Kharkiv, Ukraine

Institute for Single Crystals of NAS Ukraine

Kharkiv, Ukraine
SEARCH FILTERS
Time filter
Source Type

Zorenko Y.,Kazimierz Wielki University in Bydgoszcz | Zorenko Y.,Ivan Franko National University of Lviv | Gorbenko V.,Ivan Franko National University of Lviv | Voznyak T.,Ivan Franko National University of Lviv | And 10 more authors.
Optical Materials | Year: 2012

The work is dedicated to growth by the liquid phase epitaxy method and study of the luminescence and scintillation properties of Sc 3+ doped single crystalline films (SCF) of Lu 3Al 5O 12 (LuAG) garnet. The scintillation properties of SCF are compared with single crystal (SC) analogues grown by the Horizontal Direct Crystallization and Czochralski methods. We consider the dependence of intensity of the Sc 3+ emission in LuAG host on the activator concentration and influence of flux contamination on the light yield (LY) of the Sc 3+ luminescence in LuAG:Sc SCF with respect to their SC counterparts and the reference YAP:Ce scintillator. From the NMR investigations of LuAG:Sc SCF we confirm the substitution by Sc 3+ ions both the octahedral and dodecahedral positions of LuAG host and formation of the Sc Al and Sc Lu related emission centers, respectively. We also show that the luminescence spectrum in the UV range and decay kinetics of LuAG:Sc SCF can be effectively tuned by changing the scandium content. © 2012 Elsevier Ltd. All rights reserved.


Zoren Y.,Kazimierz Wielki University in Bydgoszcz | Zoren Y.,Ivan Franko National University of Lviv | Zorenko T.,Ivan Franko National University of Lviv | Voznyak T.,Ivan Franko National University of Lviv | And 4 more authors.
Optical Materials | Year: 2013

The comparative study of the luminescent properties of Al2O 3:Ti crystal in comparison with those for undoped Al 2O3 crystal counterpart is performed under synchrotron radiation excitation with an energy of 3.7-25 eV. Apart from the main emission band peaked at 725 nm related to the 2E → 2T 2 radiative transitions of Ti3+ ions, the luminescence of excitons localized around Ti ions in the band peaked at 290 nm and the luminescence of F+-Ti and F-Ti centers in the bands peaked at 325 and 434 nm are also found in the emission spectra of Al2O3:Ti crystal. We show also that the luminescence of Ti3+ ions in Al 2O3:Ti crystal can be effectively excited by the luminescence of excitons localized around Ti dopant as well as by the luminescence of F-Ti centers. © 2013 Elsevier B.V. All rights reserved.

Loading Institute for Single Crystals of NAS Ukraine collaborators
Loading Institute for Single Crystals of NAS Ukraine collaborators