Title :
Luminescence of Eu3+ activated Ca3Ga2Ge3O12 garnet under UV-VIS and UV-VUV excitations
Author :
Kostyk, L. ; Luchechko, A. ; Novosad, S. ; Tsvetkova, O.
Author_Institution :
Fac. of Electron., Ivan Franko Nat. Univ. of Lviv, Lviv, Ukraine
Abstract :
Eu3+ activated Ca3Ga2Ge3O12 ceramics were prepared by solid-state reaction, and characterized with XRD, UV-VIS and UV-VUV spectroscopy at temperature range 10-300K. Structural analysis revealed only garnet phase. The results have shown that Eu3+ activated Ca3Ga2Ge3O12 exhibit efficient red emitting due to the 5D0 → 7F1,2,4 transitions under 393 nm (7F0 → 5L6 transition of Eu3+) or 250 nm (the broad O2-→Eu3+ charge transfer band) excitations. A strong activator emission of Ca3Ga2Ge3O12:Eu3+ ceramics can also be obtained upon excitation with the synchrotron radiation in the long-wavelength fundamental absorption edge region and in the region of photon multiplication, where energy transfer from the host to the Eu3+ ions takes place.
Keywords :
X-ray diffraction; calcium compounds; ceramics; excited states; gallium compounds; garnets; photoluminescence; synchrotron radiation; ultraviolet spectra; visible spectra; 5D0 → 7F1,2,4 transitions; Ca3Ga2Ge3O12:Eu3+; Eu3+ activated Ca3Ga2Ge3O12 garnet; UV-VIS spectra; UV-VUV spectra; X-ray diffraction; XRD; absorption edge region; activator emission; ceramics; energy transfer; excitation; luminescence; photon multiplication; solid-state reaction; synchrotron radiation; temperature 10 K to 300 K; wavelength 250 nm; wavelength 393 nm; Ca3Ga2Ge3O12: Eu3+ ceramics; activator emission; intrinsic luminescence; synchrotron excitation;
Conference_Titel :
Oxide Materials for Electronic Engineering (OMEE), 2014 IEEE International Conference on
Conference_Location :
Lviv
Print_ISBN :
978-1-4799-5960-0
DOI :
10.1109/OMEE.2014.6912385
