4.8 Article

The Radiative Lifetime in Near-IR-Luminescent Ytterbium Cryptates: The Key to Extremely High Quantum Yields

期刊

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 33, 页码 9719-9721

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201502475

关键词

cryptands; deuterium; luminescence; photophysics; ytterbium

资金

  1. DFG
  2. Fonds der Chemischen Industrie

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A powerful strategy for the improvement of near-IR lanthanoid luminescence has been successfully employed for the first time, which involves the rational and deliberate shortening of the radiative luminescence lifetimes (rad) in molecular ytterbium complexes. In this context, the bidentate chelating unit 2,2-bipyridine-N,N-dioxide has been identified as being responsible for decreasing (rad) substantially in macrobicyclic Yb cryptates. This strategy, when combined with conventional approaches, yields unprecedented absolute near-IR quantum yields of up to 12%. This extraordinary efficiency represents the highest value measured for any molecular lanthanoid near-IR emitter. The proof-of-concept for the implementation of the new strategy opens up entirely new prospects for the field of lanthanoid luminescence.

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