Wydział Chemii

Małgorzata Sójka

Justyna Zeler

Eugeniusz Zych

2021

Journal of Alloys and Compounds

858

157676/1-157676/8

10.1016/j.jallcom.2020.157676

Naukowa

Angielski

Artykuł

Oxyorthosilicates have long history in luminescent applications e.g. as phosphors, scintillators and in emerging technologies like luminescence thermometry. In this study we report detailed research on the thermoluminescent (TL) properties of Y₂(Ge_x,Si_1-x)O₅:Pr. Despite regular TL measurements, T_max-T_stop, initial rise analysis, fading, decay of persistent luminescence, and dose effect are presented and analyzed. The possibility to deliberately manage the electron trap depths adjusting the Ge/Si ratio is explored. Glow curve of each composition consists of two main TL peaks. In the (Ge,Si) solid continuous distribution of trap energies is observed. Strong thermoluminescence is observed from all compositions after charging with X-ray radiation. Efficiency of charging traps with UV-C photons (fitting the 4f→5d₁ transition energy) lowers systematically as the Si content increases. A growing coupling of the excited 5d₁ level of Pr³⁺ and the host conduction band with the increase of Ge content is responsible for this effect. A scheme of the TL-related processes is presented using the vacuum referred binding energy (VRBE) approach for all the Y₂(Ge_x,Si_1-x)O₅:Pr phosphors.

Thermoluminescence, Bandgap engineering, Oxyorthosilicates, Oxyorthogermanates, Pr 3+ luminescence

http://dx.doi.org/10.1016/j.jallcom.2020.157676

http://www.elsevier.com