Wydział Chemii

Małgorzata Guzik

T. Aitasalo

W. Szuszkiewicz

J. Hölsä

Barbara Keller

Janina Legendziewicz

2004

Journal of Alloys and Compounds

380

368-375

10.1016/j.jallcom.2004.03.062

Naukowa

Angielski

Artykuł

This paper reports the spectroscopic properties of cerium- and praseodymium-doped alkali metal yttrium double phosphates, M₃Y(PO₄)₂:Pr³⁺, Ce³⁺; M = Na, Rb. These phosphates were obtained by a solid state reaction between lanthanide phosphate hydrates and M₃PO₄. The absorption, reflection, emission and excitation spectra were measured at room temperature, 77 and 4 K in the IR-vis-ultraviolet (UV) range. For both the Ce³⁺- and Pr³⁺-doped double phosphates, the 4f^N↔4f^N−15d transitions were detected. For the Pr³⁺-doped double phosphates, the 4f–4f transitions from the ground manifold were analyzed. The low temperature absorption spectra were used to characterize the structural modifications between the sodium and rubidium salts. For the Ce³⁺-doped double phosphate, the strong blue 5d¹→4f¹ emission band splits into two components due to the splitting of the 4f¹ configuration. Intense emission occurs mainly from the level at high dopant concentrations, since the emission is strongly quenched but was detected at the 2 mol% doping level. In spite of the forbidden 4f–4f character, the transitions have very short decay times, of the order of one μs. Dynamics of the excited states will be discussed based on the decay times and selective excited emission.

Cerium, Praseodymium, Absorption, Emission, Yttrium double phosphates

https://doi.org/10.1016/j.jallcom.2004.03.062

http://www.elsevier.com