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Monodisperse upconversion GdF3:Yb, Er rhombi by microwave-assisted synthesis.

Wang H, Nann T - Nanoscale Res Lett (2011)

Bottom Line: We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis.Typical upconversion emission from Er3+ was observed.In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute Materials for Electronics and Energy Technology (I-MEET), Friedrich Alexander Universität Erlangen-Nürnberg, Marternsstraße 7, 91058, Erlangen, Germany. wang.hai-qiao@ww.uni-erlangen.de.

ABSTRACT
We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis. Typical upconversion emission from Er3+ was observed. In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

No MeSH data available.


Upconversion spectrum of GdF3:Yb, Er nanocrystals under excitation of 980 nm.
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Figure 5: Upconversion spectrum of GdF3:Yb, Er nanocrystals under excitation of 980 nm.

Mentions: Figure 5 shows the upconversion emission spectrum of the nanocrystals from Figure 4A, under 980 nm near infra-red (NIR) excitation. Mainly two emission bands were observed, with emission peaks at 521, 545, and 660 nm. These emission peaks can be attributed to the 4f-4f transitions of the Er3+ ions. The green emission accounts for the 2H(11/2), 4S(3/2) → 4I(15/2) transition, the red emission is caused by the 4F(9/2) → 4I(15/2) transition. The difference compared with typical reported Yb/Er emission spectrum is that a weak red emission at approximately 628 nm was observed, which could be attributed to the transition 4I(9/2) → 4I(15/2). Based on Yb/Er codopants, the observed upconversion efficiency of the GdF3-based nanocrystals is relatively lower than that of the NaYF4-based nanocrystals in our lab [1]. Comparing these values with data from the literature shows that the microwave-assisted synthesis does not influence the optical properties of the nanocrystals per se.


Monodisperse upconversion GdF3:Yb, Er rhombi by microwave-assisted synthesis.

Wang H, Nann T - Nanoscale Res Lett (2011)

Upconversion spectrum of GdF3:Yb, Er nanocrystals under excitation of 980 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211330&req=5

Figure 5: Upconversion spectrum of GdF3:Yb, Er nanocrystals under excitation of 980 nm.
Mentions: Figure 5 shows the upconversion emission spectrum of the nanocrystals from Figure 4A, under 980 nm near infra-red (NIR) excitation. Mainly two emission bands were observed, with emission peaks at 521, 545, and 660 nm. These emission peaks can be attributed to the 4f-4f transitions of the Er3+ ions. The green emission accounts for the 2H(11/2), 4S(3/2) → 4I(15/2) transition, the red emission is caused by the 4F(9/2) → 4I(15/2) transition. The difference compared with typical reported Yb/Er emission spectrum is that a weak red emission at approximately 628 nm was observed, which could be attributed to the transition 4I(9/2) → 4I(15/2). Based on Yb/Er codopants, the observed upconversion efficiency of the GdF3-based nanocrystals is relatively lower than that of the NaYF4-based nanocrystals in our lab [1]. Comparing these values with data from the literature shows that the microwave-assisted synthesis does not influence the optical properties of the nanocrystals per se.

Bottom Line: We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis.Typical upconversion emission from Er3+ was observed.In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

View Article: PubMed Central - HTML - PubMed

Affiliation: Institute Materials for Electronics and Energy Technology (I-MEET), Friedrich Alexander Universität Erlangen-Nürnberg, Marternsstraße 7, 91058, Erlangen, Germany. wang.hai-qiao@ww.uni-erlangen.de.

ABSTRACT
We have synthesized a variety of monodisperse colloidal GdF3:Yb, Er upconversion nanocrystals with different shape, size, and dopants by microwave-assisted synthesis. Typical upconversion emission from Er3+ was observed. In addition to highly monodisperse spherical particles, we were able to prepare monodispersed rhombic-shaped slices that showed a tendency for self-assembly into stacks.

No MeSH data available.