Limits...
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.


Logarithmic plots of the intensity of each upconversion band in Fig. 2c versus the excitation density in the dispersed KMnF3 nanocubes tridoped with 2 mol % Tm3+, 2 mol % Er3+ and 20 mol % Yb3+.The initial input power employed for the measurement is 2W.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4660594&req=5

f3: Logarithmic plots of the intensity of each upconversion band in Fig. 2c versus the excitation density in the dispersed KMnF3 nanocubes tridoped with 2 mol % Tm3+, 2 mol % Er3+ and 20 mol % Yb3+.The initial input power employed for the measurement is 2W.

Mentions: Secondly, UC emission intensity (I) was further measured as a function of laser power (P) (Fig. 3) to explore the UC mechanism of Yb3+, Tm3+, and Er3+ ions in KMnF3 matrix. Because IUC ∝ Pn holds for the unsaturated UC process, where n is the number of pump photons absorbed per upconverted photons emitted27, the value of n can thus be determined to be the slope after linearly fitting the I-P data in a double logarithmic plot. For the tri-doped KMnF3:Yb3+/Er3+/Tm3+ sample, the obtained n values are 2.94, 1.95, 1.92, and 1.99 respectively for the UC emission peaks at 476 nm (blue), 540 nm (green), 660 nm (red), and 800 nm (NIR). Therefore, it can be deduced that the three-photon process is responsible for blue UC emission, two-photon process is responsible for green red and 800 nm UC emissions.


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)

Logarithmic plots of the intensity of each upconversion band in Fig. 2c versus the excitation density in the dispersed KMnF3 nanocubes tridoped with 2 mol % Tm3+, 2 mol % Er3+ and 20 mol % Yb3+.The initial input power employed for the measurement is 2W.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: Logarithmic plots of the intensity of each upconversion band in Fig. 2c versus the excitation density in the dispersed KMnF3 nanocubes tridoped with 2 mol % Tm3+, 2 mol % Er3+ and 20 mol % Yb3+.The initial input power employed for the measurement is 2W.
Mentions: Secondly, UC emission intensity (I) was further measured as a function of laser power (P) (Fig. 3) to explore the UC mechanism of Yb3+, Tm3+, and Er3+ ions in KMnF3 matrix. Because IUC ∝ Pn holds for the unsaturated UC process, where n is the number of pump photons absorbed per upconverted photons emitted27, the value of n can thus be determined to be the slope after linearly fitting the I-P data in a double logarithmic plot. For the tri-doped KMnF3:Yb3+/Er3+/Tm3+ sample, the obtained n values are 2.94, 1.95, 1.92, and 1.99 respectively for the UC emission peaks at 476 nm (blue), 540 nm (green), 660 nm (red), and 800 nm (NIR). Therefore, it can be deduced that the three-photon process is responsible for blue UC emission, two-photon process is responsible for green red and 800 nm UC emissions.

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.