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Two‐Photon Absorption Properties of Eu 3+ ‐DPA‐Triazolyl Complexes and the Derived Silica Nanoparticles Embedding These Complexes
Author(s) -
Adumeau Pierre,
Gaillard Claire,
Boyer Damien,
Canet JeanLouis,
Gautier Arnaud,
Mahiou Rachid
Publication year - 2015
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402617
Subject(s) - chemistry , phosphorescence , photoluminescence , absorption (acoustics) , luminescence , photochemistry , spectroscopy , absorption spectroscopy , nanoparticle , singlet state , triplet state , excited state , fluorescence , analytical chemistry (journal) , atomic physics , nanotechnology , optoelectronics , molecule , materials science , optics , physics , quantum mechanics , chromatography , organic chemistry , composite material
Several complexes and silica‐based nanohybrids of rare‐earth ions (Eu 3+ , Gd 3+ ) 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 Gd 3+ ‐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 T 1 state differs notably between the complexes and the NPs embedding the complexes. Moreover the dependence of Eu 3+ 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 (S 0 →T 1 ) upon NIR excitation.