Wydział Chemii

Chantal Lorbeer

Joanna Cybińska

Anja-Verena Mudring

2011

Crystal Growth and Design

11

1040-1048

10.1021/cg101140r

Naukowa

Angielski

Artykuł

Inorganic luminescent materials (phosphors) find widespread scientific and industrial applications. For potential applications, nanoscale phosphors are favored because of the reduced scattering and the possibility to miniaturize devices. In such materials, the optical behavior is strongly dependent on impurities or defects in the crystal lattice, so that a well-defined reaction protocol with fixed parameters is compulsory to ensure the quality of the obtained material. The fast and facile conversion of europium acetate via microwave radiation with and in different tetrafluoroborate ionic liquids to oxygen-free, hexagonal EuF₃ nanoparticles is investigated in detail. The study of the influence of the different reaction parameters on the structural, morphological, and luminescent properties predominantly reveals a strong influence of the chosen ionic liquid. The particle morphology varies from small spherical particles to rods forming different types of aggregates, such as bundles, columns, or spherical agglomerations. The luminescence spectra show the characteristic orange-red emission due to the dominating ⁵D₀ → ⁷F₁ transition of Eu³⁺. The ⁵D₀ quantum efficiency could be tuned from 2% up to 44% depending on the ionic liquid used for synthesis.

https://doi.org/10.1021/cg101140r

https://www.acs.org/content/acs/en.html