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. Issue 46 (28th September 2015)

• Record Type: Journal Article
• Authors: Avram, Daniel; Cojocaru, Bogdan; Urda, Adriana; Tiseanu, Ion; Florea, Mihaela; Tiseanu, Carmen
• Is Part Of: Physical chemistry chemical physics. Volume 17:Issue 46(2015)
• Page Start: 30988
• Page End: 30992
• Publication Date: 2015-09-28
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c5cp03458b
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : A first study that correlates the down- and up-conversion emission properties of lanthanide(s)-(co) dopants with the CeO2 structure. 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.