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Near-Infrared Luminescence from Visible-Light-Sensitized Hybrid Materials Covalently Linked with Tris(8-hydroxyquinolinate)-lanthanide [Er(III), Nd(III), and Yb(III)] Derivatives

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journal contribution
posted on 16.12.2010, 00:00 by Lining Sun, Song Dang, Jiangbo Yu, Jing Feng, Liyi Shi, Hongjie Zhang
A series of new near-infrared (NIR) luminescent lanthanide−quinolinate derivatives [Ln(Q−Si)3] and xerogels (named as LnQSi−Gel, Ln = Er, Nd, Yb) covalently linked with the Ln(Q−Si)3 by using the 8-hydroxyquinoline-functionalized alkoxysilane (Q−Si) have been synthesized. The obtained xerogel materials LnQSi−Gel are rigid and show homogeneous by field-emission scanning electron microscopy (FE-SEM) images. The Fourier-transform infrared (FT-IR), fluorescence spectra of Ln(Q−Si)3, and LnQSi−Gel were measured, and the corresponding luminescence decay analyses were recorded. Of importance here is that the excitation spectra of the Ln(Q−Si)3 and LnQSi−Gel extend to the region of visible light (more than 500 nm). Upon ligand-mediated excitation with the visible light, the Ln(Q−Si)3 and LnQSi−Gel show the characteristic NIR-luminescence of the corresponding lanthanide ions through the intramolecular energy transfer from the ligands to the lanthanide ions. The good luminescent performances enable these NIR-luminescent xerogel materials to have possible applications in medical diagnostics, laser systems, and optics, etc.