title: Origin of luminescence enhancement and quenching of europium complex in solution phase containing Ag nanoparticles.
abstract: Luminescence enhancement and quenching of Eu(TTA)(3) x 2 H(2)O complex in DMF (N,N-dimethylformamide) solution containing silver nanoparticles were observed, which depended on the concentrations of both europium complex and silver nanoparticles. Their origins were discussed based on absorption spectra, excitation and emission spectra, and luminescent decay dynamics. The results indicated that when the concentration of Eu complex was high enough, strong interaction among complex molecules occurred. The presence of Ag nanoparticles definitely decreased the interaction among complex molecules. In the solution containing Ag nanoparticles the electronic-dipole transition rate of (5)D(0)-(7)F(2) increased due to enhanced local field surrounding Eu(3+) ions, while the nonradiative transition rate from (5)D(0) decreased owing to decreased resonant energy transfer among europium complex molecules. These two factors lead to the luminescence enhancement of europium complex. As to the luminescent quenching, was attributed to absorption competition between Ag nanoparticles and europium complex at excited wavelength.
authors: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
authors: Xiaona
authors: X
authors: Fang
authors: Hongwei
authors: H
authors: Song
authors: Liping
authors: L
authors: Xie
authors: Qiong
authors: Q
authors: Liu
authors: Hui
authors: H
authors: Zhang
authors: Xue
authors: X
authors: Bai
authors: Biao
authors: B
authors: Dong
authors: Yu
authors: Y
authors: Wang
authors: Wei
authors: W
authors: Han
mesh_terms: D000042:Absorption; D003102:Colloids; D004126:Dimethylformamide; D005063:Europium / Q000737:chemistry*; D005559:Formamides / Q000737:chemistry*; D049449:Luminescence; D053768:Metal Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet
chemical_list: D003102:Colloids; D005559:Formamides; D009942:Organometallic Compounds; D012996:Solutions; D012834:Silver; D005063:Europium; D004126:Dimethylformamide