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Comparative study of crystal field analysis in Pr3+ and Yb3+-doped K2LaX5 (X= Cl-, Br-) ternary halides and Yb3+-doped A3Lu(PO4)2 (A=Na+, Rb+) double phosphates. Charge transfer band observations of Yb3+-doped systems.

Autorzy

Janina Legendziewicz

Joanna Cybińska

Małgorzata Guzik

Georges Boulon

G. Meyer

Rok wydania

2008

Czasopismo

Optical Materials

Numer woluminu

30

Strony

1655-1666

DOI

10.1016/j.optmat.2007.11.005

Kolekcja

Naukowa

Język

Angielski

Typ publikacji

Artykuł

Streszczenie

The spectroscopic properties of praseodymium and ytterbium-doped ternary halides of K 2 (La,Ln)X 5 (X=Cl − , Br − ) type and ytterbium-doped double phosphates of formula A 3 Lu(PO 4 ) 2 (A=an alkali metal: Na, Rb) were presented. Absorption, emission and luminescence excitation spectra were measured at 4, 10 and 293K in the wide spectral range (VUV–IR). Luminescence of the samples was excited using various pumping lines, including the synchrotron radiation. In the Pr 3+ ion systems the Stark components determined from the absorption and emission spectra were simulated by using a phenomenological crystal field model for 4f 2 configuration of the Pr 3+ ion in the K 2 (La,Pr)X 5 crystals. The difference in the emission behaviour of the ternary chloride and bromide crystals were explained basing on C.F. effect and vibrational mode in the discussed systems.For the Yb 3+ -doped samples the strong fundamental 2 F 5/2 → 2 F 7/2 emission in the IR range as well as the CT emission bands were observed. The influence of the host lattice on charge transfer luminescence was investigated. The temperature effect and mechanisms of the observed phenomena are discussed.

Słowa kluczowe

Pr3+ ion, Yb3+ ion, Charge transfer emission, Crystal field calculation, Ternary halides, Double phosphates

Adres publiczny

https://doi.org/ 10.1016/j.optmat.2007.11.005

Strona internetowa wydawcy

http://www.elsevier.com

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