Monday, 23 May 2005 - 4:00 PM
306

This presentation is part of: Solid State and Materials Chemistry II

Infrared Fluorescence Emission Characteristics of Chalcogenide-Bound Erbium Complexes and their Fluoropolymer Composites

Santanu Banerjee1, Anna Kornienko1, John G. Brennan1, G.A. Kumar2, and Richard E. Riman2. (1) Rutgers,The State University Of New Jersey, Piscataway, NJ, (2) Rutgers,The State University Of New Jersey, PISCATAWAY, NJ

The synthesis, characterization and near infrared luminescence properties of new erbium ceramic cluster (THF)14Er10S6Se12I6 (Er10) and the molecular erbium thiolate (DME)2Er(SC6F5)3 (Er1) are described. The near infrared luminescence properties are studied by optical absorption, photoluminescence and vibrational spectroscopy. The recorded emission spectrum of the 4I13/2³4I15/2 transition of Er3+ was centered at 1544 nm with a bandwidth of 76 and 104 nm for Er10 and Er1 respectively. The 1544 nm emission decay time for all reported similar Er-organometallic complexes are in the microsecond regime resulting low reported quantum efficiencies. The fluorescence decay times of 3 and 2.88 ms are obtained for Er10 and Er1 respectively, yield calculated quantum efficiencies of 78% and 75%. These values are the highest reported efficiencies for molecular compounds. These efficiencies and improved fluorescence spectral properties are attributed to the absence of direct Er coordination with fluorescence quenching vibrational groups such as C-H and O-H and direct coordination of Er to heavy anions like S, Se, and I which form weak bonds that facilitate a locally reduced phonon energy host environment for the erbium. Since these Er-compounds are surrounded by organic ligands, solubility in organic polymers and solvents is expected which will also minimize the light scattering and effect high transparency. We will report the near infrared optical properties of Er10 and Er1 doped into perfluorocyclobutyl (PFCB) polymer as the host because of its low attenuation in the infrared region compared to the well known PMMA system. These fluoropolymer composite materials emit strongly at 1544 nm


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