Judd-Ofelt analysis of β-NaGdF4: Yb3+, Tm3+ and β-NaGdF4:Er3+ single crystals

Villanueva Delgado, Pedro; Biner, Daniel; Krämer, Karl (2017). Judd-Ofelt analysis of β-NaGdF4: Yb3+, Tm3+ and β-NaGdF4:Er3+ single crystals. Journal of luminescence, 189, pp. 84-90. Elsevier 10.1016/j.jlumin.2016.04.023

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Hexagonal β-NaGdF4 single crystals were grown by the Bridgman technique, one doped with 5% Yb3+, 0.5% Tm3+ and the other with 1% Er3+. Based on polarized absorption spectra a Judd–Ofelt analysis was performed using the software RELIC. The energy barycenters of the room temperature absorption bands were used to refine the 4f wavefunctions in the intermediate coupling approximation, and obtain the Slater integrals F(2), (4), (6) and the spin–orbit coupling parameter ζ . The experimental oscillator strengths were fitted, using calculated matrix elements, to the three Judd–Ofelt parameters Ω2,4,6Ω2,4,6. The radiative lifetimes and branching ratios were determined and compared to experimental data. The oscillator strengths of selected transitions relevant to upconversion processes are discussed.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Villanueva Delgado, Pedro; Biner, Daniel and Krämer, Karl

Subjects:

500 Science > 530 Physics
500 Science > 540 Chemistry

ISSN:

0022-2313

Publisher:

Elsevier

Language:

English

Submitter:

Karl Krämer

Date Deposited:

19 Jan 2017 15:46

Last Modified:

29 Nov 2017 12:46

Publisher DOI:

10.1016/j.jlumin.2016.04.023

BORIS DOI:

10.7892/boris.90906

URI:

https://boris.unibe.ch/id/eprint/90906

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