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Triple-doped KMnF3:Yb3+/Er3+/Tm3+ nanocubes: four-color upconversion emissions with strong red and near-infrared bands.

Wang H, Hong X, Han R, Shi J, Liu Z, Liu S, Wang Y, Gan Y - Sci Rep (2015)

Bottom Line: It was found that these nanocubes can simultaneously exhibited four-color (blue, green, red and NIR) upconversion emissions under a single 980 nm near-infrared (NIR) laser excitation, which should have potential multicolor in vivo imaging applications.Specifically, the red (660 nm) and NIR (800 nm) peaks, known as two "optical windows" for imaging biological tissues, were strong.The spectral and pump analyses indicated the two-photon processes were responsible for the both red and NIR emissions.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001. P. R. China.

ABSTRACT
Triple-doped (Yb(3+)/Er(3+)/Tm(3+)) KMnF3 nanocubes with uniform sizes of 250 nm were synthesized by a facile hydrothermal route using the oleic acid as the capping agent. It was found that these nanocubes can simultaneously exhibited four-color (blue, green, red and NIR) upconversion emissions under a single 980 nm near-infrared (NIR) laser excitation, which should have potential multicolor in vivo imaging applications. Specifically, the red (660 nm) and NIR (800 nm) peaks, known as two "optical windows" for imaging biological tissues, were strong. The spectral and pump analyses indicated the two-photon processes were responsible for the both red and NIR emissions.

No MeSH data available.


Related in: MedlinePlus

Schematic of the energy level diagram for the Er3+, Tm3+, and Yb3+ ions as well as the proposed UC mechanisms to explain the blue, green, red and NIR UC emissions.CR = Cross relaxation.
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f4: Schematic of the energy level diagram for the Er3+, Tm3+, and Yb3+ ions as well as the proposed UC mechanisms to explain the blue, green, red and NIR UC emissions.CR = Cross relaxation.

Mentions: At last, the overall UC emission mechanism and population process in rare-earth doped KMnF3 is schematically illustrated in Fig. 4. Upon excitation at 980 nm, the red UC emission (660 nm) can be ascribed to nonradiative energy transfer from the 4S3/2 levels of Er3+ to the 4T1 level of Mn2+, followed by the falling-back transition to the 4F9/2 level of Er3+ and the 4F9/2 to 4I15/2 transition.


Triple-doped KMnF3:Yb3+/Er3+/Tm3+ nanocubes: four-color upconversion emissions with strong red and near-infrared bands.

Wang H, Hong X, Han R, Shi J, Liu Z, Liu S, Wang Y, Gan Y - Sci Rep (2015)

Schematic of the energy level diagram for the Er3+, Tm3+, and Yb3+ ions as well as the proposed UC mechanisms to explain the blue, green, red and NIR UC emissions.CR = Cross relaxation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4660594&req=5

f4: Schematic of the energy level diagram for the Er3+, Tm3+, and Yb3+ ions as well as the proposed UC mechanisms to explain the blue, green, red and NIR UC emissions.CR = Cross relaxation.
Mentions: At last, the overall UC emission mechanism and population process in rare-earth doped KMnF3 is schematically illustrated in Fig. 4. Upon excitation at 980 nm, the red UC emission (660 nm) can be ascribed to nonradiative energy transfer from the 4S3/2 levels of Er3+ to the 4T1 level of Mn2+, followed by the falling-back transition to the 4F9/2 level of Er3+ and the 4F9/2 to 4I15/2 transition.

Bottom Line: It was found that these nanocubes can simultaneously exhibited four-color (blue, green, red and NIR) upconversion emissions under a single 980 nm near-infrared (NIR) laser excitation, which should have potential multicolor in vivo imaging applications.Specifically, the red (660 nm) and NIR (800 nm) peaks, known as two "optical windows" for imaging biological tissues, were strong.The spectral and pump analyses indicated the two-photon processes were responsible for the both red and NIR emissions.

View Article: PubMed Central - PubMed

Affiliation: School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001. P. R. China.

ABSTRACT
Triple-doped (Yb(3+)/Er(3+)/Tm(3+)) KMnF3 nanocubes with uniform sizes of 250 nm were synthesized by a facile hydrothermal route using the oleic acid as the capping agent. It was found that these nanocubes can simultaneously exhibited four-color (blue, green, red and NIR) upconversion emissions under a single 980 nm near-infrared (NIR) laser excitation, which should have potential multicolor in vivo imaging applications. Specifically, the red (660 nm) and NIR (800 nm) peaks, known as two "optical windows" for imaging biological tissues, were strong. The spectral and pump analyses indicated the two-photon processes were responsible for the both red and NIR emissions.

No MeSH data available.


Related in: MedlinePlus