title: Pure and almost pure NIR emission of Tm and Tm,Yb-CeO2 under UV, X-ray and NIR up-conversion excitation: key roles of level selective antenna sensitization and charge-compensation.
abstract: 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.
authors.affiliation: National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest-Magurele, Romania. tiseanuc@yahoo.com carmen.tiseanu@inflpr.ro.
authors.forename: Daniel
authors.initials: D
authors.lastname: Avram
authors.affiliation: University of Bucharest, Department of Chemical Technology and Catalysis, 4-12 Regina ElisabetaBvd., Bucharest, Romania.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Cojocaru
authors.affiliation: University of Bucharest, Department of Chemical Technology and Catalysis, 4-12 Regina ElisabetaBvd., Bucharest, Romania.
authors.forename: Adriana
authors.initials: A
authors.lastname: Urda
authors.affiliation: National Institute for Laser, Plasma and Radiation Physics, P.O. Box MG-36, RO 76900, Bucharest-Magurele, Romania. tiseanuc@yahoo.com carmen.tiseanu@inflpr.ro.
authors.forename: Ion
authors.initials: I
authors.lastname: Tiseanu
authors.affiliation: University of Bucharest, Department of Chemical Technology and Catalysis, 4-12 Regina ElisabetaBvd., Bucharest, Romania.
authors.forename: Mihaela
authors.initials: M
authors.lastname: Florea
authors.affiliation: University of Bucharest, Department of Chemical Technology and Catalysis, 4-12 Regina ElisabetaBvd., Bucharest, Romania.
authors.forename: Carmen
authors.initials: C
authors.lastname: Tiseanu
mesh_terms: D002563:Cerium / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013932:Thulium / Q000737:chemistry*; D014965:X-Rays; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D002563:Cerium; C030583:ceric oxide; D013932:Thulium; D015018:Ytterbium