Wydział Chemii

Iva Milisavljevic

Yiquan Wu

Eugeniusz Zych

2020

Journal of Luminescence

224

117243/1-117243/8

10.1016/j.jlumin.2020.117243

Naukowa

Angielski

Artykuł

The effect of doping of Gd³⁺ ions into Ce: SrF₂ on luminescence properties was investigated in (Gd, Ce): SrF₂ nanoparticle powders synthesized via the co-precipitation method, which contained fixed amount of Ce³⁺ ions and variable amounts of Gd³⁺ ions. (Gd, Ce): SrF₂ nanoparticle powders showed UV range emissions under λ_ex = 273 nm and λ_ex = 298 nm excitation. Photoluminescence emission, excitation, and lifetime measurements revealed the existence of Ce³⁺ → Gd³⁺ radiative energy transfer and provided evidence to the prevailing effect of Ce³⁺ in excitation and emission in the (Gd, Ce) co-doped system due to the existence of fully allowed 4f-5d transitions. The presence of Gd³⁺ was shown to affect the crystal field and symmetry around Ce³⁺ ions and enhances the absorption efficiency by two-fold. Furthermore, (Gd, Ce): SrF₂ transparent ceramics with 13.2% of in-line optical transmittance in the UV spectral range was obtained via the vacuum hot-pressing method. The increase in the UV luminescence emission intensity of Ce³⁺ in presence of Gd³⁺, as well as the ability to process (Gd, Ce): SrF₂ as transparent ceramics, are what make (Gd, Ce): SrF₂ a promising material for optical applications in the UV region.

Transparent ceramics, UV emission, Radiative energy transfer

http://dx.doi.org/10.1016/j.jlumin.2020.117243

http://www.elsevier.com