期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 17, 页码 9500-9506出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202101923
关键词
boric acid; boron; electronic communication; lone pair electrons; room temperature phosphorescence
资金
- National Natural Science Foundation of China [21522505]
- Fundamental Research Funds for Central Universities
Recent research found that non-metal materials like boric acid can emit long-lived room-temperature phosphorescence, suggesting the unique role of boron in constructing new phosphorescent materials.
For a long time, phosphors with long-lived emission are dominated by rare earth/transition metal ion-doped sulfides and oxides. Recently, organic materials capable of emitting long-lived room-temperature phosphorescence (RTP) are reported, carbon skeletons are almost the exclusive structural feature of the conjugated luminophores. Herein, we reported that boric acid, a non-metal and C-free material, could emit RTP with lifetime up to 0.3 s. Detailed investigations indicated the weak conjugation between the n electrons of the O atoms in the B-O confined space was the possible origin of RTP. Similar RTP was also found in electron-rich N/F systems, namely, BN and BF3 (BF4-). Importantly, the vacant pz0 orbital of B was found to contribute to the relevant unoccupied molecular orbitals involved in excitation, which is different from previous reports on phosphorescence from arylboronic acids. The results confirm the unique role of B as a versatile structure motif for construction of new RTP materials.
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