title: Spectroscopic properties and Judd-Ofelt theory analysis of erbium chelates.
abstract: Erbium chelates including tris(acetylacetonato) erbium(III) monohydrate, tris(acetylacetonato)(1,10-phenanthroline) erbium(III) and tris(trifluoroacetylacetonato)(1,10-phenanthroline) erbium(III) are synthesized. Judd-Ofelt theory is employed on basis of the UV-Vis-NIR absorption spectra of erbium chelates dissolved in methanol. Judd-Ofelt parameters of erbium chelates are determined by a least square fitting and dealt with the chemical structure of erbium chelates. Photoluminescence characteristics of erbium chelates are investigated upon excitation at 488 nm by an Ar(+) laser. The qualitative correlation of Judd-Ofelt parameters with photoluminescence properties for erbium chelates is also discussed. It is found that larger Omega(6) value for erbium chelate is and larger photoluminescence intensity at 1.54 microm is, and Omega(2) value should contribute to the photoluminescence full width at half maximum (FWHM) at 1.54 microm. The changes of Judd-Ofelt parameters result from the introduction of the second ligand phenathroline or the substitution of electron-drawing group CF(3) in beta-diketone for erbium chelates.
authors.affiliation: Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, 38 Zheda Road, Hangzhou 310027, PR China.
authors.forename: Huaishan
authors.initials: H
authors.lastname: Wang
authors.forename: Guodong
authors.initials: G
authors.lastname: Qian
authors.forename: Zhiyu
authors.initials: Z
authors.lastname: Wang
authors.forename: Minquan
authors.initials: M
authors.lastname: Wang
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D008024:Ligands; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics
chemical_list: D002614:Chelating Agents; D008024:Ligands; D004871:Erbium