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Delayed Doublet Emission in a Cerium(III) Complex |
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| Authors: | Peiyu Fang Jiawen Liu Huanyu Liu Dr. Gang Yu Pengxiang Fu Prof. Bingwu Wang Prof. Jianglan Qu Prof. Yanyi Huang Prof. Zuqiang Bian Prof. Zhiwei Liu |
| Affiliation: | 1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China;2. Key Laboratory of Urban Agriculture (North China), Beijing University of Agriculture, Beijing, 102206 China These authors contributed equally to this work. Contribution: Investigation (equal), Methodology (equal), Writing - original draft (equal);3. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China Contribution: Investigation (supporting);4. Key Laboratory of Urban Agriculture (North China), Beijing University of Agriculture, Beijing, 102206 China;5. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China Contribution: Supervision (equal);6. Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871 China Contribution: Funding acquisition (supporting), Supervision (equal) |
| Abstract: | Doublet emission from open-shell molecules has demonstrated its research and application value in recent years. However, understandings of the photoluminescence mechanism of open-shell molecules are far less than that of closed-shell molecules, leading to challenges in molecular design of efficient doublet emission systems. Here we report a cerium(III) 4-(9H-carbozol-9-yl)phenyl-tris(pyrazolyl)borate complex Ce(CzPhTp)3 with a new luminescence mechanism of delayed doublet emission, which also represents the first example with metal-centered delayed photoluminescence. The energy gap between the doublet and triplet excited states of Ce(CzPhTp)3 is reduced by the management of the inner and outer coordination spheres, thereby promoting efficient energy transfer between the two excited states and activating the delayed emission. The photoluminescence mechanism discovered may provide a new way for the design of efficient doublet emission and bring insights into rational molecular design and energy level regulation in open-shell molecules. |
| Keywords: | Cerium Doublet Emission Energy Transfer Luminescence Open-Shell Molecules |