Wydział Chemii

Anna Madej

Eugeniusz Zych

2015

RSC Advances

5

104441-104450

10.1039/c5ra21573k

Naukowa

Angielski

Artykuł

Phase-pure orthorhombic and monoclinic Sr2SiO4and its Ce3+-orEu2+-activated versions weresynthesized using H3BO3or SrCl2fluxes. The effects of the type of dopant and its concentration, as wellas the type offlux on the crystallization were revealed and discussed. The luminescence properties ofthe phase-pure Ce3+-orEu2+-activated powders were characterized both at 30 K and 300 K. Thepresence of two luminescent sites was proved in both types of structures and in the case of bothactivators, and their characteristic excitation and emission spectra were presented. Energy transfer fromions emitting at higher energies to those giving luminescence at lower energies was shown to take placein both polymorphs and in the case of each of the dopants. Eu2+emissions of both sites in bothstructures were located fully in the visible part of the spectrum, while part of the Ce3+luminescenceoccurred in the long-wavelength UV. Room-temperature radioluminescence spectra showed that onlythe site emitting at longer wavelengths, in both structures and for both dopants, is active in thescintillation process. For thefirst time, for both dopants, luminescence from the two sites in bothpolymorphs of Sr2SrO4has been spectroscopically characterized at 30 K and at room temperature.

http://dx.doi.org/10.1039/c5ra21573k

https://www.rsc.org/