Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 115, Issue 34, Pages 16849-16855Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp204622c
Keywords
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Funding
- Foundation for Polish Science
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Fluoride (NaYF4) nanocrystals (ca. 30 nm size) codoped with the rare earth ions Yb3+ and Er3+/Tm3+ were synthesized with a wet chemical technique and characterized by TEM and XRD. The materials were well dispersible and stable in organic solvents. Nonlinear optical properties of these upconverting nanoparticles (UCNPs) were investigated as a function of wavelength in a wide spectral range with the Z-scan technique using a tunable femtosecond laser system. It was found that the nonlinear response exhibited strong anomalies close to the wavelengths of one-photon f-f optical transitions of lanthanide ions. The strong nonlinearities around 980 nm were attributed to the multiphoton absorption and energy transfer processes from the Yb3+ ions (donor) to Er3+/Tm3+ ions (acceptor). These phenomena may find numerous applications including 3D biological imaging or optical switching mechanisms requiring strong near-resonant responses, not unlike those in e.g. metal vapors.
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