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Synthesis, characterization and luminescent properties of europium complexes with 2,4,6‐tris‐(2‐pyridyl)‐ s ‐triazine as highly efficient sensitizers
Author(s) -
Kang Jie,
Chen YingNan,
Wang AiLing,
Li HaiYan,
Qu YanRong,
Zhang HaiXia,
Chu HaiBin,
Zhao YongLiang
Publication year - 2015
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2906
Subject(s) - europium , luminescence , chemistry , triazine , spectroscopy , photochemistry , infrared spectroscopy , ligand (biochemistry) , emission spectrum , titration , quantum efficiency , ion , inorganic chemistry , materials science , polymer chemistry , spectral line , organic chemistry , biochemistry , physics , receptor , optoelectronics , quantum mechanics , astronomy
Using 2,4,6‐tris‐(2‐pyridyl)‐ s ‐triazine (TPTZ) as a neutral ligand, and p ‐hydroxybenzoic acid, terephthalic acid and nitrate as anion ligands, five novel europium complexes have been synthesized. These complexes were characterized using elemental analysis, rare earth coordination titrations, UV/vis absorption spectroscopy and infrared spectroscopy. Luminescence spectra, luminescence lifetime and quantum efficiency were investigated and the mechanism discussed in depth. The results show that the complexes have excellent emission intensities, long emission lifetimes and high quantum efficiencies. The superior luminescent properties of the complexes may be because the triplet energy level of the ligands matches well with the lowest excitation state energy level of Eu 3+ . Moreover, changing the ratio of the ligands and metal ions leads to different luminescent properties. Among the complexes, Eu 2 (TPTZ) 2 (C 8 H 4 O 4 )(NO 3 ) 4 (C 2 H 5 OH)·H 2 O shows the strongest luminescence intensity, longest emission lifetime and highest quantum efficiency. Copyright © 2015 John Wiley & Sons, Ltd.