Avram Daniel, Cojocaru Bogdan, Urda Adriana, Tiseanu Ion, Florea Mihaela, Tiseanu Carmen
National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest-Magurele, Romania.
University of Bucharest, Department of Chemical Technology and Catalysis, 4-12 Regina ElisabetaBvd., Bucharest, Romania.
Phys Chem Chem Phys. 2015 Dec 14;17(46):30988-92. doi: 10.1039/c5cp03458b.
Herein, we report on the pure and almost pure near-infrared (NIR) emission at around 807 nm observed for Tm(Yb) (co)-doped CeO2 nanoparticles (NPs) under UV, X-ray and NIR up-conversion excitation. The optical responses are attributed to the low-lying charge-transfer of CeO2 that acts as a selective antenna sensitizer of the Tm (3)H4 emission and Yb doping that lowers the local symmetry at Tm sites and introduces additional phonon modes. Selective antenna sensitization is also observed for Er/Ho (Yb) (co)-doped CeO2 NPs. To the best of our knowledge, this is a first study which correlates the down- and up-conversion emission properties of lanthanide(s)-(co) dopants with the CeO2 structure highlighting also the outstanding potential of these NPs in high-penetration tissue imaging and therapy.
在此，我们报道了在紫外、X射线和近红外上转换激发下，观察到Tm(Yb)（共）掺杂的CeO2纳米颗粒（NPs）在807 nm左右有纯净且近乎纯净的近红外（NIR）发射。这些光学响应归因于CeO2的低能电荷转移，它作为Tm（3）H4发射的选择性天线敏化剂，以及Yb掺杂降低了Tm位点的局部对称性并引入了额外的声子模式。在Er/Ho（Yb）（共）掺杂的CeO2 NPs中也观察到了选择性天线敏化。据我们所知，这是第一项将镧系（共）掺杂剂的下转换和上转换发射特性与CeO2结构相关联的研究，同时也突出了这些纳米颗粒在高穿透组织成像和治疗方面的巨大潜力。
