title: Near-infrared luminescence from visible-light-sensitized hybrid materials covalently linked with tris(8-hydroxyquinolinate)-lanthanide [Er(III), Nd(III), and Yb(III)] derivatives.
abstract: 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.
authors.affiliation: Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, People's Republic of China. lnsun@shu.edu.cn
authors.forename: Lining
authors.initials: L
authors.lastname: Sun
authors.forename: Song
authors.initials: S
authors.lastname: Dang
authors.forename: Jiangbo
authors.initials: J
authors.lastname: Yu
authors.forename: Jing
authors.initials: J
authors.lastname: Feng
authors.forename: Liyi
authors.initials: L
authors.lastname: Shi
authors.forename: Hongjie
authors.initials: H
authors.lastname: Zhang
mesh_terms: D004871:Erbium / Q000737:chemistry; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D015394:Molecular Structure; D009354:Neodymium / Q000737:chemistry; D017378:Quinolinic Acid / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D019265:Spectroscopy, Near-Infrared; D014325:Tromethamine / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry
chemical_list: C477453:6-hydroxyquinolinic acid; D028581:Lanthanoid Series Elements; D014325:Tromethamine; D009354:Neodymium; D004871:Erbium; D017378:Quinolinic Acid; D015018:Ytterbium