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Highly Efficient Near-IR Photoluminescence of Er Immobilized in Mesoporous SBA-15.

Xue YL, Wu P, Liu Y, Zhang X, Lin L, Jiang Q - Nanoscale Res Lett (2010)

Bottom Line: It is a 29.3% boost in fluorescent cross section compared to what has been obtained in conventional silica.The upconversion coefficient in Yb-Er-SBA-15 is relatively small compared to that in other ordinary glass hosts.The increased fluorescent cross section and lowered upconversion coefficient could benefit for the high-gain optical amplifier.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
SiO(2) mesoporous molecular sieve SBA-15 with the incorporation of erbium ions is studied as a novel type of nanoscopic composite photoluminescent material in this paper. To enhance the photoluminescence efficiency, two schemes have been used for the incorporation of Er(3+) where (1) Er(3+) is ligated with bis-(perfluoromethylsulfonyl)-aminate (PMS) forming Er(PMS)(x)-SBA-15 and (2) Yb(3+) is codoped with Er(3+) forming Yb-Er-SBA-15. As high as 11.17 × 10(-21)cm(2) of fluorescent cross section at 1534 nm and 88 nm of "effective bandwidth" have been gained. It is a 29.3% boost in fluorescent cross section compared to what has been obtained in conventional silica. The upconversion coefficient in Yb-Er-SBA-15 is relatively small compared to that in other ordinary glass hosts. The increased fluorescent cross section and lowered upconversion coefficient could benefit for the high-gain optical amplifier. Finally, the Judd-Ofelt theory has also been used for the analyses of the optical spectra of Er(PMS)(x)-SBA-15.

No MeSH data available.


Absorption and emission cross sections of Yb-Er-SBA-15 for 1:10 Er3+/Yb3+ concentration ratio
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Figure 13: Absorption and emission cross sections of Yb-Er-SBA-15 for 1:10 Er3+/Yb3+ concentration ratio

Mentions: Figure 12 shows emission spectra of Yb-Er-SBA-15 under the 980 nm pump excitation where Yb3+ and Er3+ concentration ratio is 1:10 (blue curve), 1:8 (green curve), 1:5 (red curve) and 1:3 (yellow curve), respectively. It can be seen clearly that following the increment of Yb3+ proportion, the emission intensity incessantly increases, indicating that the denser the Yb3+ ions, the more the excited electrons of Yb3+ ions are transferred to Er3+ and the stronger the population inversion between excited state 4I13/2 and ground state 4I15/2 of Er3+ ions is. But the increment is not endless. Our experiments were repeated many times for high Yb3+ ratio specimen (Er3+:Yb3+ = 1:12 and 1:14) and the results showed the strongest emission occurred at the ratio of Er3+:Yb3+ = 1:10. As Yb3+ ions have a much lower melting temperature (819°C) than Er3+ ions (1522°C), the high Yb3+ ratio specimens are also with a reduced melting temperature and easy to be burned under the pump excitation. Figure 13 shows the absorption and emission cross sections for the specimen with Er3+:Yb3+ = 1:10 in which the emission cross section reaches maximum with peak value of σem = 11.17 × 10−21cm2. This is 29.3% higher than the results in ordinary silica [14] and 2.42% higher than that in Er(PMS)x-SBA-15, respectively.


Highly Efficient Near-IR Photoluminescence of Er Immobilized in Mesoporous SBA-15.

Xue YL, Wu P, Liu Y, Zhang X, Lin L, Jiang Q - Nanoscale Res Lett (2010)

Absorption and emission cross sections of Yb-Er-SBA-15 for 1:10 Er3+/Yb3+ concentration ratio
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2991226&req=5

Figure 13: Absorption and emission cross sections of Yb-Er-SBA-15 for 1:10 Er3+/Yb3+ concentration ratio
Mentions: Figure 12 shows emission spectra of Yb-Er-SBA-15 under the 980 nm pump excitation where Yb3+ and Er3+ concentration ratio is 1:10 (blue curve), 1:8 (green curve), 1:5 (red curve) and 1:3 (yellow curve), respectively. It can be seen clearly that following the increment of Yb3+ proportion, the emission intensity incessantly increases, indicating that the denser the Yb3+ ions, the more the excited electrons of Yb3+ ions are transferred to Er3+ and the stronger the population inversion between excited state 4I13/2 and ground state 4I15/2 of Er3+ ions is. But the increment is not endless. Our experiments were repeated many times for high Yb3+ ratio specimen (Er3+:Yb3+ = 1:12 and 1:14) and the results showed the strongest emission occurred at the ratio of Er3+:Yb3+ = 1:10. As Yb3+ ions have a much lower melting temperature (819°C) than Er3+ ions (1522°C), the high Yb3+ ratio specimens are also with a reduced melting temperature and easy to be burned under the pump excitation. Figure 13 shows the absorption and emission cross sections for the specimen with Er3+:Yb3+ = 1:10 in which the emission cross section reaches maximum with peak value of σem = 11.17 × 10−21cm2. This is 29.3% higher than the results in ordinary silica [14] and 2.42% higher than that in Er(PMS)x-SBA-15, respectively.

Bottom Line: It is a 29.3% boost in fluorescent cross section compared to what has been obtained in conventional silica.The upconversion coefficient in Yb-Er-SBA-15 is relatively small compared to that in other ordinary glass hosts.The increased fluorescent cross section and lowered upconversion coefficient could benefit for the high-gain optical amplifier.

View Article: PubMed Central - HTML - PubMed

ABSTRACT
SiO(2) mesoporous molecular sieve SBA-15 with the incorporation of erbium ions is studied as a novel type of nanoscopic composite photoluminescent material in this paper. To enhance the photoluminescence efficiency, two schemes have been used for the incorporation of Er(3+) where (1) Er(3+) is ligated with bis-(perfluoromethylsulfonyl)-aminate (PMS) forming Er(PMS)(x)-SBA-15 and (2) Yb(3+) is codoped with Er(3+) forming Yb-Er-SBA-15. As high as 11.17 × 10(-21)cm(2) of fluorescent cross section at 1534 nm and 88 nm of "effective bandwidth" have been gained. It is a 29.3% boost in fluorescent cross section compared to what has been obtained in conventional silica. The upconversion coefficient in Yb-Er-SBA-15 is relatively small compared to that in other ordinary glass hosts. The increased fluorescent cross section and lowered upconversion coefficient could benefit for the high-gain optical amplifier. Finally, the Judd-Ofelt theory has also been used for the analyses of the optical spectra of Er(PMS)(x)-SBA-15.

No MeSH data available.