Hydrothermal Synthesis of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="bold">β</mml:mi><mml:msub><mml:mrow><mml:mtext>-NaYF</mml:mtext></mml:mrow><mml:mtext>4</mml:mtext></mml:msub></mml:mrow></mml:math>:Yb, Er Nanocrystals with Upconversion Fluorescence Using Tetraethylene Pentamine as Chelating Ligand

<table>Upconverted fluorescence spectra of NaYF<sub>4</sub>:Yb, Er prepared under different rare earth concentration (RE/TEPA = 1 : 1; <svg height="9.125" id="M14" style="vertical-align:-0.11285pt" version="1.1" viewbox="0 0 5.0124998 9.125" width="5.0124998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,9.125)">
<g transform="translate(72,-64.7)">
<text transform="matrix(1,0,0,-1,-71.95,64.86)">
<tspan style="font-size: 12.50px; " x="0" y="0">𝑡</tspan>
</text>
</g>
</g>
</svg> = 6 h; water/ethanol = 1 : 1).</table>

Journal of Nanomaterials

fig11

Figure 11

Figure 11: Hydrothermal Synthesis of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="bold">β</mml:mi><mml:msub><mml:mrow><mml:mtext>-NaYF</mml:mtext></mml:mrow><mml:mtext>4</mml:mtext></mml:msub></mml:mrow></mml:math>:Yb, Er Nanocrystals with Upconversion Fluorescence Using Tetraethylene Pentamine as Chelating Ligand 

Journal of Nanomaterials

Hydrothermal Synthesis of β-NaYF4:Yb, Er Nanocrystals with Upconversion Fluorescence Using Tetraethylene Pentamine as Chelating Ligand

Figure 11