Abstract
Electroluminescence of f-f transition lanthanide complex is a traditional topic for display over decades. Here we report highly efficient organic light-emitting diodes based on a new terbium(III) complex with novel ligand CPMIP (1-(4-cyanophenyl)-3-methyl-4-isobutyryl-pyrazoline-5-one). The high triplet energy level of CPMIP (3.0 eV) and inhibited quenching effects in the solid-state lead to a nearly 100% photoluminescent quantum efficiency of Tb(CPMIP)3. The best Tb(CPMIP)3 device exhibited maximum external quantum efficiency up to 19.7%, setting a new record of OLEDs based on f-f transition lanthanide complexes.
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Acknowledgements
This work was supported by the National Basic Research Program of China (2017YFA0205100), and the Key Project of Science and Technology Plan of Beijing Education Commission (KZ201910028038). Zifeng Zhao acknowledges financial support from the China Postdoctoral Science Foundation (2018M641065, 2021T140009) and BMS-Junior Fellow.
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Zhao, Z., Bian, M., Lin, C. et al. Efficient green OLEDs achieved by a terbium(III) complex with photoluminescent quantum yield close to 100%. Sci. China Chem. 64, 1504–1509 (2021). https://doi.org/10.1007/s11426-021-1036-0
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DOI: https://doi.org/10.1007/s11426-021-1036-0