CHEN Bao jui, KONG Xianggui, L&#220; Shaozhe, QIN Weiping, WAN Haiyu, TAMG Bo, XU Wu, HUANG Shihua. A NEW MATERIAL FOR UPCONVERSION──Tin<sup>3+</sup>-DOPED MFT GLASSES[J]. Chinese Journal of Luminescence, 1999,20(4): 290-294
CHEN Bao jui, KONG Xianggui, L&#220; Shaozhe, QIN Weiping, WAN Haiyu, TAMG Bo, XU Wu, HUANG Shihua. A NEW MATERIAL FOR UPCONVERSION──Tin<sup>3+</sup>-DOPED MFT GLASSES[J]. Chinese Journal of Luminescence, 1999,20(4): 290-294DOI:
we have a designation and preparation of MFT glasses for upconversion
the glasses consisted of TeO
2
and fluoride: PbF
2
AIF
3
BaF
2
NaF and the impurity Tm
2
O
3
. In this glassy system the oxide improve forming ability
the fluoridesimprove the microscopic environment around RE ions in glasses. In this glass host thecontent of Tm
2
O
3
achieves to 4% molar and crystallization not occurred. The absorptionspectra of the glass containing Tm
3+
of 0.2% molar were measured and the transitionsfrom ground state
3
H
6
to the different excited state
1
D
2
1
G
4
1
F
3
(
3
F
2
) and
3
H
4
were observed. The absorption band of
3
F
3
(
3
F
2
) is suiting for upconversion under red light excitation. In order to understand the dependence of excited wavelength on upconversionfluorescence intensity
the relationship between upconversion fluorescence intensity andexcited wavelength were measured when the wavelength is various from 640nm to 670nm. We find that the excitation at 650urn is efficient for upconversion of transitionfrom
1
G
4
to
3
H
6
and 670nm is efficient from
1
D
2
to
3
H
4
. The variation of upconversionluminescence intensity with concentration of Tm
3+
in MFT glasses under 650urn excitation was observed
and the quenching concentration is 0.6% molar was obtained
thequenching concentration of Tm
3+
was higher about 3 times than in other glassesobserved by numerous author. At last
we have a study on the upconversion fluorescence slope efficiency
the relationship between upconversion luminescence intensity andexcited power density was determined
and the 2-photon upconversion process wasassigned by fitting experimental data.