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Two-Photon Absorption Properties of Eu3+-DPA-Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes.

Authors :
Adumeau, Pierre
Gaillard, Claire
Boyer, Damien
Canet, Jean‐Louis
Gautier, Arnaud
Mahiou, Rachid
Source :
European Journal of Inorganic Chemistry. Mar2015, Vol. 2015 Issue 7, p1233-1242. 10p.
Publication Year :
2015

Abstract

Several complexes and silica-based nanohybrids of rare-earth ions (Eu3+, Gd3+) have been synthesized from dimethyl 4-azidopyridine-2,6-dicarboxylate ( 4) following the Click chemistry approach. A complete spectroscopic study indicates that such compounds exhibit strong sensitization by the antenna effect from both UV and NIR excitations. The Gd3+-based materials show phosphorescence under ambient conditions, which originates from the lowest-energy intra-ligand triplets. Fine analysis of the NIR excitation spectra using time resolved photoluminescence spectroscopy (TRS) indicates that the spectral repartition of the triplet T1 state differs notably between the complexes and the NPs embedding the complexes. Moreover the dependence of Eu3+ luminescence vs. incident beam power in the NIR region diverges from pure quadratic dependence expected in the framework of the two-photon absorption process. The results are discussed considering the occurrence of a direct singlet-to-triplet optical absorption transition (S0→T1) upon NIR excitation. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14341948
Volume :
2015
Issue :
7
Database :
Academic Search Index
Journal :
European Journal of Inorganic Chemistry
Publication Type :
Academic Journal
Accession number :
101349258
Full Text :
https://doi.org/10.1002/ejic.201402617