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Novel Erbium(III)-encapsulated complexes based on π-extended anthracene ligands bearing G3-aryl-ether dendron: synthesis and photophysical studies

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Abstract

A series of inert and photo-stable Er(III)-encapsulated complexes based on β-extended dendritic anthracene ligands bearing G3-aryl-ether dendron ([G3-AnX]-CO2H), which retain different π-bridging systems, such as single (X= S), double (X= D) and triple (X= T) bonds was designed and synthesized to establish the structure-property relationship. The near infrared emission intensities of Er(III)-encapsulated complexes were enhanced dramatically by increasing the π-conjugated extension of anthracene ligands. The time-resolved luminescence spectra show monoexponential decays with a lifetime of 2.0∼2.4 ms for Er3+ ions in thin films, and calculated intrinsic quantum yields of Er3+ ions are in the range of 0.025∼0.03%. As a result, all Er(III)-encapsulated dendrimer complexes exhibit the near IR emission with the following order: Er3+-[G3-AnD]3(terpy) > Er3+-[G3-AnS]3(terpy) ≈ Er3+-[G3-AnT]3(terpy), because Er3+-[G3-AnD]3(terpy) has a higher relatively spectral overlap J value and energy transfer efficiency. In addition, the lack of detectable phosphorescence and no significant spectral dependence of the π-extended anthracene moieties on the solvent polarity support energy transfer from their singlet state to the central Er3+ ion taking place in Er3+-[G3-AnX]3(terpy).

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Authors and Affiliations

  1. IT Convergence Technology Research Laboratory, Electronics and Telecommunications Research Institute, 305-700, Daejeon, Korea

    Nam Seob Baek & Yong Hee Kim

  2. Department of Advanced Materials Chemistry and Center for Advanced Photovoltaic Materials (IRTC), Korea University, 339-700, Chungnam, Korea

    Soo-Gyun Roh, Dong Hyun Lee, Kang Deuk Seo & Hwan Kyu Kim

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  1. Nam Seob Baek
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  2. Yong Hee Kim
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  3. Soo-Gyun Roh
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  6. Hwan Kyu Kim
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Correspondence to Hwan Kyu Kim.

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Baek, N.S., Kim, Y.H., Roh, SG. et al. Novel Erbium(III)-encapsulated complexes based on π-extended anthracene ligands bearing G3-aryl-ether dendron: synthesis and photophysical studies. Macromol. Res. 17, 672–681 (2009). https://doi.org/10.1007/BF03218927

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