Silica sol-gel glasses incorporating dual-luminescent Yb quinolinolato complex: Processing, emission and photosensitising properties of the 'antenna' ligand

Flavia Artizzu, Francesco Quochi, Michele Saba, Danilo Loche, Maria Laura Mercuri, Angela Serpe, Andrea Mura, Giovanni Bongiovanni, Paola Deplano

Research output: Contribution to journalArticlepeer-review

Abstract

The [Yb(5,7ClQ)2(H5,7ClQ)2Cl] (1) complex, that exhibits dual-luminescence in the visible (ligand-centered) and in the NIR (Yb-centered), has been incorporated into a silica sol-gel glass obtaining 1-doped glassy material which is optically transparent and homogeneous and with good mechanical properties. The doped sol-gel glass can be considered a "solid state solution" and photophysical studies demonstrate that the emissive properties of the dopant complex are preserved in the silica matrix. Observed NIR decay times fall in the μs range and are likely limited by "second-sphere" matrix interactions. The ligand-to-metal energy transfer mechanism occurs on ultrafast timescale and involves ligand triplet states. The sensitization efficiency of the antenna quinolinolato ligand toward Yb3+ is estimated to be as high as ∼80%. The Yb natural radiative lifetime observed for 1 in MeCN-EtOH solution (τrad = 438 μs) is the shortest reported so far for ytterbium complexes.

Original languageEnglish
Pages (from-to)13147-13153
Number of pages7
JournalDalton Transactions
Volume41
Issue number42
DOIs
Publication statusPublished - 14 Nov 2012
Externally publishedYes

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