Abstract:
A method of the transfer of NaYF$_4$:Yb$^{3+}$Tm$^{3+}$/NaYF$_4$ upconversion core/shell nanoparticles with an average size of $30$ nm via laser-induced forward transfer is proposed. The method provides a high spatial resolution by creating a “sandwich” structure on the donor substrate: for reliable fixation, nanoparticles are located between gold layers $50$ and $20$ nm thick. The transfer of upconversion nanoparticles is implemented by focusing nanosecond laser radiation into a $30$-$\mu m$-diameter spot and at optimal pulse energies of $8.5$–$25$$\mu$J. It has been shown that, despite large temperature, $\Delta T>1000\,$ K, and pressure, $\Delta P>150\,$MPa, fluctuations upconversion nanoparticles fully retain their photoluminescent characteristics.
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