Efficient up-conversion in Yb:Er:NaTXO42 thermal nanoprobes. Imaging of their distribution in a perfused mouseReport as inadecuate




Efficient up-conversion in Yb:Er:NaTXO42 thermal nanoprobes. Imaging of their distribution in a perfused mouse - Download this document for free, or read online. Document in PDF available to download.

Yb and Er codoped NaTXO42 T = Y, La, Gd, Lu and X = Mo, W disordered oxides show a green Er3+ related up-conversion UC efficiency comparable to that of Yb:Er:β-NaYF4 compound and unless 3 times larger UC ratiometric thermal sensitivity. The similar UC efficiency of Yb:Er doped NaTXO42 and β-NaYF4 compounds allowed testing equal subcutaneous depths of ex-vivo chicken tissue in both cases. This extraordinary behavior for NaTXO42 oxides with large cutoff phonon energy ħω≈ 920 cm-1 is ascribed to 4F9-2 electron population recycling to higher energy 4G11-2 level by a phonon assisted transition. Crystalline nanoparticles of Yb:Er:NaLuMoO42 have been synthesized by sol-gel with sizes most commonly in the 50–80 nm range, showing a relatively small reduction of the UC efficiency with regards to bulk materials. Fluorescence lifetime and multiphoton imaging microscopies show that these nanoparticles can be efficiently distributed to all body organs of a perfused mouse.



Author: Carlos Zaldo , María Dolores Serrano, Xiumei Han, Concepción Cascales, Marta Cantero, Lluís Montoliu, Elvira Arza, Valeria R.

Source: http://plos.srce.hr/



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