Wydział Chemii

Anna Dobrowolska

Eugeniusz Zych

2010

Radiation Measurements

45

621-623

10.1016/j.radmeas.2009.12.010

Naukowa

Angielski

Artykuł

Eu-doped barium hafnate powders, BaHfO₃:Eu, prepared with ceramic method have quite peculiar spectroscopic properties, which can be significantly altered changing the dopant concentration as well as preparation atmosphere. When synthesis is performed in a reducing atmosphere, a fraction of Eu gets reduced and produces a broad-band emission peaking around 480 nm. Due to a partial overlapping of the excitation spectra of Eu³⁺ and Eu²⁺ luminescence, the emission colour can vary between bluish green, when only Eu²⁺ is excited, red when solely Eu³⁺ is stimulated and white upon simultaneous excitation of both Eu³⁺ and Eu²⁺ activator ions around 290 nm. Upon X-ray excitation only Eu³⁺ luminescence is produced. Radioluminescence of undoped BaHfO₃ consists of a broad-band peaking around 410 nm, which disappears when Eu enters the host. Materials prepared in a reducing atmosphere do not show any phase separation even for higher Eu concentrations.

Barium hafnate, Radioluminescence, White emission

https://doi.org/10.1016/j.radmeas.2009.12.010