期刊
MATERIALS HORIZONS
卷 6, 期 6, 页码 1259-1264出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9mh00220k
关键词
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资金
- National Natural Science Foundation of China [21772095, 21674049, 61875090]
- Science Fund for Distinguished Young Scholars of Jiangsu Province of China [BK20150041]
- 1311 Talents Program of Nanjing University of Posts and Telecommunications (Dingshan)
- Six Talent Plan of Jiangsu Province [2016XCL050]
- Postgraduate Research AMP
- Practice Innovation Program of Jiangsu Province [46030CX17750]
Molecular aggregation plays an important role in the luminescence processes of organic pi-conjugated materials. However, the exact relations between aggregated structures and organic emission behaviors are still unclear. Here, we designed a series of CN-substituted phenylcarbazole isomers, which show varied aggregated structures and extraordinary organic ultralong room-temperature phosphorescence (OURTP) with lifetime up to 0.92 s. Systematic experimental and theoretical studies reveal that the OURTP properties are closely related to the splitting energy (Delta epsilon) of H-aggregation. Specifically, the Delta epsilon-controlled thermally activated reversed phase transformation from the low-lying dark state to the high-lying transition-allowed emission state of H-aggregation was identified, for the first time, as the key process in OURTP: larger Delta epsilon leads to longer lifetime, while smaller Delta epsilon results in short lifetime but higher OURTP efficiency. These findings, which refer to the fundamental luminescence mechanism in aggregated states, should shed new light on the understanding of the emission behaviors of organic solids.
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