Abstract

<p>(A) Plot of the absolute conversion efficiency (<i>η</i><sub>uc</sub>) [W/W] of the reported upconversion nanoparticle sample versus the excitation intensity at <i>λ</i><sub>ex</sub> = 978 nm measured using a calibrated integrating sphere set-up. <i>η</i><sub>uc</sub> is the ratio of the emitted power integrated over the entire emission spectral range (500–700 nm) to the absorbed power. (B) Size histogram obtained by analyzing the transmission electron microscopy (TEM) images of NaYF<sub>4</sub>:Yb,Er UCNPs (330 particles). A typical TEM-image is shown in (C).</p

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