powder samples were synthesized with solid-state and solution reacting methods
respectively. The upconversion (UC) emission properties under a continuous-wave semiconductor laser diode excitation at 980 nm were studied. The relationship between UC emission features and the hosts was explored. Effects of the S
2-
-Yb
3+
and S
2-
-Er
3+
charge transfer state (CTS) on the transfer-energy rate from Yb
3+
to Er
3+
and the transition rate between the Er
3+
levels were analyzed in details. Furthermore
the energy-transfer processes between Yb
3+
and Er
3+
based on the energy matching conditions and the UC emission mechanism were discussed with schematic energy-level schemes.
关键词
Keywords
references
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