[The upconversion mechanisms for the red and green emissions in Er3+ doped and Er3+ -Yb3+ codopoed fluoride materials based on experiment].
Guang Pu Xue Yu Guang Pu Fen Xi
; 25(9): 1382-4, 2005 Sep.
Article
em Zh
| MEDLINE
| ID: mdl-16379270
ABSTRACT
The rare earth Er3+ doped and Er3+ -Yb3+ co-doped fluoride samples were prepared. Under 980 nm laser excitation, the intense red (650 nm) and green (545 nm) upconversion luminescence was obtained corresponding to the transitions 4S3/2, 2H11/2--4I15/2 and 4F9/2--4I15/2, respectively. For the Er3+ -Yb3+ co-doped fluoride samples, it was found that the ratio of the red upconversion luminescence to the green one decreases as the Er3+ concentration increases. The dependence of upconversion intensities on excitation power indicates that two-photon absorption processes are responsible for the upconverted luminescence. The possible upconversion mechanisms of the red and green emissions are discussed based on the energy-matching conditions and the quadratic dependence on excitation power.
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Base de dados:
MEDLINE
Assunto principal:
Itérbio
/
Luminescência
/
Érbio
/
Fluoretos
Idioma:
Zh
Revista:
Guang Pu Xue Yu Guang Pu Fen Xi
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
China