Tuning Mixed‐Valent Eu2+/Eu3+ in Strontium Formate Frameworks for Multichannel Photoluminescence |
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| Authors: | Wei Liu Dr Lijia Liu Dr Yanlong Wang Lanhua Chen Dr John A McLeod Linju Yang Jia Zhao Dr Zhiyong Liu Prof?Dr Juan Diwu Prof?Dr Zhifang Chai Prof?Dr Thomas E Albrecht‐Schmitt Dr Guokui Liu Prof?Dr Shuao Wang |
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| Affiliation: | 1. School for Radiological and interdisciplinary Sciences (RAD-X), Soochow University, Suzhou, China;2. Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University-Western University Center for Synchrotron Radiation Research, Soochow University, Suzhou, China;3. Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, USA;4. Chemical Sciences and Engineering Division, Argonne National Laboratory, Argonne, Illinois, USA |
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| Abstract: | Cooperative performance of mixed‐valent Eu2+/Eu3+ in single‐compound phosphors offers significant advantages in color rendering and luminescence efficiency, but their synthesis is challenging because of Eu2+ 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 Eu2+/Eu3+ with a controlled ratio. These materials exhibit rich photoluminescence, including intrinsic‐ and sensitized‐emissions of Eu2+ and Eu3+, 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 Eu2+/Eu3+ emissions provides outstanding properties for applications as self‐calibrated luminescent thermometers with a wide working temperature range. Further incorporation of Tb3+ into the MOFs results in white light, utilizing all Eu2+,Tb3+, and Eu3+ emissions in a single crystalline lattice. |
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| Keywords: | europium luminescence metal– organic frameworks mixed valence photoluminescence |
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