Luminescence properties of nanocrystalline europium titanate Eu2Ti2O7

0449013 - ÚFE 2016 RIV CH eng J - Článek v odborném periodiku
Mrázek, Jan - Surýnek, Martin - Bakardjieva, Snejana - Buršík, Jiří - Proboštová, Jana - Kašík, Ivan
Luminescence properties of nanocrystalline europium titanate Eu2Ti2O7.
Journal of Alloys and Compounds. Roč. 645, October (2015), s. 57-63. ISSN 0925-8388. E-ISSN 1873-4669
Grant CEP: GA ČR GP13-37368P
Institucionální podpora: RVO:67985882 ; RVO:61388980 ; RVO:68081723
Klíčová slova: Nanostructured materials * Europium * Luminescence
Kód oboru RIV: JA - Elektronika a optoelektronika, elektrotechnika; CA - Anorganická chemie (UACH-T); BM - Fyzika pevných látek a magnetismus (UFM-A)
Impakt faktor: 3.014, rok: 2015

Nanocrystalline europium titanate Eu2Ti2O7 with tailored structural properties was prepared by a sol-gel approach. Structural properties of prepared nanocrystals were correlated to the steady-state and time-resolved luminescence spectroscopy of europium ions incorporated within formed nanocrystals. The formation of nanocrystalline Eu2Ti2O7 raised up the existence of two inequivalent positions of Eu3+ ions. Eu3+ ions displaced in highly symmetrical positions within the pyrochlore lattice provided low intensity luminescence and lifetime shorter than 10 mu s. Eu3+ ions displaced in asymmetrical positions on the surface of formed nanoparticles provided lifetimes on the level of 50 mu s. Number of Eu3+ ions displaced in asymmetrical positions was decreased according to increase size and crystallinity of formed nanocrystals. The presented results provide fundamental information about the influence of the structure and the morphology of formed nanocrystals to their luminescence properties
Trvalý link: http://hdl.handle.net/11104/0250599