A. Kaminska et al. / Journal of Alloys and Compounds 509 (2011) 7993–7997
7997
λexc= 960 nm
These results confirm very good optical properties of ytterbium-
doped ternary lanthanum chloride from the point of view of its
potential applications.
K2LaCl5:Yb
5% Yb,
5% Yb,
λ
λ
900
800
700
600
500
400
10% Yb,
10% Yb,
15% Yb,
15% Yb,
25% Yb,
25% Yb,
= 982 nm
=1031 nm
= 982 nm
=1031 nm
= 982 nm
=1031 nm
Acknowledgements
The work has been financially supported from science resources
of the Polish Ministry of Science and Higher Education as research
projects no. N N202 203838 and N N204 131838.
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A study of the influence of temperature on the radiative intra-
2
shell f–f transitions (2F5/2 → F7/2) of Yb3+ ions in ternary lanthanum
chloride powders hosts has been presented. The strong emis-
sion around 982 nm has been observed under direct excitation
of the luminescence center with continuous wave 960 nm line of
Ti:sapphire laser pumped by Ar-ion laser. The temperature quench-
ing effect of the luminescence was rather week, especially in the
samples with higher concentration of ytterbium (15 and 25%).
Additionally the probability of the f–f radiative transitions of Yb3+
ions in these samples was almost temperature independent for
more heavily doped samples (with 15 and 25% of Yb) and only
weakly temperature dependent for less doped samples (with 5
and 10% of Yb).