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Tuning Mixed‐Valent Eu 2+ /Eu 3+ in Strontium Formate Frameworks for Multichannel Photoluminescence
Author(s) -
Liu Wei,
Liu Lijia,
Wang Yanlong,
Chen Lanhua,
McLeod John A.,
Yang Linju,
Zhao Jia,
Liu Zhiyong,
Diwu Juan,
Chai Zhifang,
AlbrechtSchmitt Thomas E.,
Liu Guokui,
Wang Shuao
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201602621
Subject(s) - phosphor , photoluminescence , luminescence , valence (chemistry) , materials science , europium , doping , formate , strontium , analytical chemistry (journal) , chemistry , optoelectronics , catalysis , biochemistry , organic chemistry , chromatography
Cooperative performance of mixed‐valent Eu 2+ /Eu 3+ in single‐compound phosphors offers significant advantages in color rendering and luminescence efficiency, but their synthesis is challenging because of Eu 2+ oxidation. Using the tunable nature of the metal‐ion nodes in metal–organic frameworks (MOFs), we present an in situ reduction and crystallization route for preparing MOFs and doping Eu 2+ /Eu 3+ with a controlled ratio. These materials exhibit rich photoluminescence, including intrinsic‐ and sensitized‐emissions of Eu 2+ and Eu 3+ , and long‐lived luminescence from charge transfer. Color rendering can be easily achieved by fine‐tuning the valence states of Eu. A linear relation between temperature and the intensity ratio of Eu 2+ /Eu 3+ emissions provides outstanding properties for applications as self‐calibrated luminescent thermometers with a wide working temperature range. Further incorporation of Tb 3+ into the MOFs results in white light, utilizing all Eu 2+ ,Tb 3+ , and Eu 3+ emissions in a single crystalline lattice.