ZHENG Ke-zhi, QIN Wei-ping,. Upconversion Luminescence of Mn<sup>2+</sup> in Yb<sup>3+</sup>-Mn<sup>2+</sup> Codoped CaF<sub>2</sub> Materials[J]. Chinese Journal of Luminescence, 2019,40(11): 1321-1326
Lanthanide-doped upconversion luminescence generally features in narrow emission band and fixed emission wavelength. In order to obtain photo upconversion with wide-spectrum emission characteristic upon near-infrared laser excitation
upconversion luminescence of CaF
2
:Yb
3+
and CaF
2
:Yb
3+
/Mn
2+
materials is investigated. Yb
3+
and Mn
2+
ions are codoped into CaF
2
materials as activators. CaF
2
:Yb
3+
and CaF
2
:Yb
3+
/Mn
2+
bulky materials are synthesized using high-temperature solid state reactions. The upconversion luminescence properties of Yb
3+
doped and Yb
3+
-Mn
2+
codoped CaF
2
materials are investigated upon 980 nm laser excitation. The experimental results indicate that compared with CaF
2
:Yb
3+
system
a new upconversion emission peaked at 620 nm is obtained in CaF
2
:Yb
3+
/Mn
2+
materials. The cooperative energy transfer from Yb
3+
-dimers to Mn
2+
is considered to be the main reason for populating excited state of Mn
2+
ions and the emission peaked at 620 nm comes from its
4
T
1
6
A
1
transition. The cooperative energy transfer from Yb
3+
-dimers to Mn
2+
is efficient in CaF
2
:Yb
3+
/Mn
2+
materials to populate excited Mn
2+
and to obtain room-temperature upconversion emission of Mn
2+
ions.
关键词
Keywords
references
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