16 February 2010 Synthesis and characterization of upconversion emission on lanthanides doped ZrO2 nanocrystals coated with SiO2 for biological applications
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Abstract
Er doped and Yb-Er-Tm codoped ZrO2 nanocrystals of average 80 nm in size were prepared by a sol-gel process with the presence of nonionic (PLURONIC F-127) surfactant, and the up-conversion emission was characterized under IR (980 nm) excitation. The effect of the codoped conditions on the crystalline structure and photoluminescence properties were studied. A strong green emission was produced with 5 mol %, 0.2 mol %, 0.01 mol % of Yb3+-Er3+-Tm3+ codoped ZrO2 respectively. It was prepared Er doped ZrO2 -SiO2 core-shell and SiO2 coated Er doped ZrO2 in 2-propanol and water, respectively. The presence of the silica shell of average of 15 nm in thickness has been confirmed by transmition electron microscopy. Photolumineiscence studies show that the silica shell does not affect the emission when the nanoparticles are excited with 980 nm. The up-converting Yb3+-Er3+-Tm3+ codoped ZrO2 nanocrystal has showed to be a powerful tool to future detection techniques. The viability of the nanoparticles of codoped ZrO2 for biological imaging was confirmed by multiphotonic microscope imaging of cervix tissue with inserted codoped ZrO2 nanoparticles. The cervix tissue has a moderate dysplasia. The nanoparticles were introduced at 80 % of the tissue depth (5 μm) without being functionalized.
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Tzarara López-Luke, Tzarara López-Luke, Elder De La Rosa, Elder De La Rosa, Ana Lilia González-Yebra, Ana Lilia González-Yebra, Beatriz González-Yebra, Beatriz González-Yebra, Carlos Ángeles-Chávez, Carlos Ángeles-Chávez, David Solís, David Solís, Pedro Salas, Pedro Salas, Carlos Saldaña, Carlos Saldaña, Octavio Meza, Octavio Meza, } "Synthesis and characterization of upconversion emission on lanthanides doped ZrO2 nanocrystals coated with SiO2 for biological applications", Proc. SPIE 7576, Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications II, 75760T (16 February 2010); doi: 10.1117/12.842993; https://doi.org/10.1117/12.842993
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