The First Example of Tb-3-Containing Metallopolymer-Type Hybrid Materials with Efficient and High Color-Purity Green Luminescence

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Date

2015-02

Authors

Zhang, Zhao
Feng, Heini
Liu, Lin
Yu, Chao
Lu, Xingqiang
Zhu, Xunjin
Wong, Wai-Kwok
Jones, Richard A.
Pan, Mei
Su, Chengyong

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Abstract

In the series of homo-leptic trinuclear complexes {[Ln(3)(L)(4)Cl-4(MeOH)(H2O)]center dot Cl} (Ln = La, 1; Ln = Eu, 2; Ln = Tb, 3 or Ln = Gd, 4) self-assembled from the allyl-modified benzimidazole-type ligand HL (4-allyl-2-(1H-benzo[d]imidazol-2-yl)-6-methoxyphenol) and LnCl(3)center dot 6H(2)O, a suitable energy level match endows efficient green luminescence (Phi(overall) = 72%) of Tb-3-arrayed complex 3. The copolymerization between each of these complex monomers 1-4 and C=C-containing MMA (methyl methacrylate) or NBE (norbornene) shows that degradative chain transfer of the terminal four flexible allyl groups within restrains their radical polymerization with MMA while it does not hinder their effective ring-opening metathesis polymerization (ROMP) with NBE. Thus, two kinds of PMMA-supported doping hybrid materials 1@PMMA, 2@PMMA, 3@PMMA and 4@PMMA and PNBE-supported metallopolymer-type hybrid materials Poly( NBE-1), Poly(NBE-2), Poly(NBE-3) and Poly(NBE-4) are obtained, respectively. Especially for both 3@PMMA and Poly(NBE-3) with high color-purity characteristic green emission of Tb3+ ions, improved physical properties including significantly enhanced luminescence (Phi(overall) = 76% or 83%) are observed, and covalent-bonding endows a higher-concentration self-quenching as compared to physical doping.

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Zhang, Zhao, Heini Feng, Lin Liu, Chao Yu, Xingqiang Lü, Xunjin Zhu, Wai-Kwok Wong, Richard A. Jones, Mei Pan, and Chengyong Su. "The first example of Tb 3-containing metallopolymer-type hybrid materials with efficient and high color-purity green luminescence." Dalton Transactions 44, no. 13 (Feb., 2015): 6229-6241.