Optical properties of a tetradentate bis(beta-diketonate) europium(III) complex.
Eu2(BPOPB)3H2O, an europium complex chelated with bis(beta-diketone), was synthesized. Its properties have been investigated by absorption spectrum, emission spectrum and luminescence lifetime measurement. The complex displays strong red luminescence upon irradiation at the ligand band around 355 nm, which indicates that the bis-beta-diketonate ligand BPOPB is an efficient sensitizer. The Judd-Ofelt parameters obtained from the emission spectrum of Eu2(BPOPB)3H2O have been used to calculate the total spontaneous emission probabilities (A), the radiative lifetime (tau(rad)), the fluorescence branching ratio (beta) and the stimulated emission cross-sections (sigma). The luminescence lifetimes are determined to be 402 and 169 micros for Eu2(BPOPB)3H2O and Eu(DBM)3(H2O)2, respectively. The relationship between the structures of rare-earth complexes and luminescence lifetimes was analyzed. The radiative properties reveal that Eu2(BPOPB)3H2O is potential to be an efficient luminescent material.
Chen
Biao
B
Department of History of Science and Technology and Archaeometry, University of Science and Technology of China, Hefei, Anhui 230026, PR China. chenbiao@ustc.edu.cn
Luo
Yanhua
Y
Liang
Hao
H
Xu
Jie
J
Guo
Fuquan
F
Zhang
Yizhong
Y
Lin
Aibin
A
Liu
Xuan
X
D004121:Dimethyl Sulfoxide; D005063:Europium / Q000737:chemistry*; D007659:Ketones / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D013053:Spectrophotometry
D007659:Ketones; D009942:Organometallic Compounds; D005063:Europium; D004121:Dimethyl Sulfoxide