Abstract
Lanthanide luminescent materials with high quantum yield and thermal stability are of key importance for their practical application. Here we report crystal structures and luminescent properties of [Eu(pfbz)2(phen)Cl] (1) and [Tb(pfbz)2(phen)Cl] (2) (pfbz = Pentafluorobenzoate). Single-crystal analysis reveals that both 1 and 2 crystallize in a polar space group of Cmc21. Investigation on their luminescent properties indicates that the solid-state quantum yields of 1 and 2 are 97.7% and 90.7%, respectively, while their efficiency of the sensitization process is as high as 100%, revealing that polar structures are more favorable to obtain high quantum yields. Thermogravimetric analysis reveals that both 1 and 2 can be stable up to 240 °C. More importantly, temperature-dependent luminescent spectra of 1 indicate its luminescent intensity at 612 nm only decreased by 5% from room temperature to 373 K, whereas at 373 K, its luminescent intensity remains almost constant for 36 h. Considering that 1 represents the highest quantum yield among known Eu-coordination polymers and its performance as the LED material is better than that of commercially widely used luminescent materials of (Sr,Ca)AlSiN3:Eu (630 nm) and (Sr,Ca)AlSiN3:Eu (640 nm), the present work provides an excellent substitute for commercial LED materials.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (92161203, 21721001, 22022108).
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Ye, MY., Zhang, MX., Xu, QF. et al. Highly stable Eu-coordination polymer exhibiting the highest quantum yield. Sci. China Chem. 66, 1400–1405 (2023). https://doi.org/10.1007/s11426-023-1572-7
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DOI: https://doi.org/10.1007/s11426-023-1572-7