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Circularly Polarized Luminescence and Tuning Chromaticity of Eu(III)‐Grafting Chiral Polymer Based on Variable Position of the Substitution
Author(s) -
Li Junfeng,
Li Fei,
Jiang Xiaoxiang,
Wei Guo,
Cheng Yixiang,
Zhu Chengjian
Publication year - 2013
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201300392
Subject(s) - luminescence , moiety , polymer , materials science , crystallography , chromophore , monomer , chemistry , photochemistry , stereochemistry , organic chemistry , optoelectronics
The novel chiral conjugated polymers P‐1 and P‐3 are prepared from the monomers S‐M‐2 and S‐M‐3 with ( R,R )‐1,2‐aminocyclohexane ( M‐1 ) via a nucleophilic addition–elimination reaction, respectively. The Eu(III)‐grafting chiral polymers P‐2 and P‐4 could be obtained by direct coordination reaction of Eu(TTA) 3 ·2H 2 O with P‐1 and P‐3 , respectively. Photoexcitation of P‐2 produces pink color emission as a result of the combination of partial blue self‐emission chromophore of P‐1 along with the red color from the Eu(TTA) 3 moiety, whereas P‐4 shows the exclusively red color emission from the Eu(III) ( 5 D 0 → 7 F 2 ) transition due to almost complete excitation energy transfer from the macromolecular chain to the Eu(TTA) 3 moiety. The choice substitution of phenyl derivative of the polymer plays a crucial role on the efficient energy transfer from the polymer chain to Eu(III) ion center. Meanwhile, the g lum value of the dissymmetry factor of circularly polarized luminescence (CPL) for the 5 D 0 → 7 F 2 transition of Eu(III) for P‐4 reaches as high as +0.0207, whereas P‐2 exhibits the largest g lum value about +0.0464 centered at 434 nm.