期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 3, 页码 595-600出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.8b03712
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资金
- National Natural Science Foundation of China [21875104, 51673095, 91833304, 91833302, 61605074]
- National Basic Research Program of China (973 Program) [2015CB932200]
- Natural Science Fund for Distinguished Young Scholars of Jiangsu Province [BK20180037]
- Natural Science Fund for Colleges and Universities of Jiangsu Province [17KJB430020]
- Nanjing Tech Start-up Grant [3983500158, 3983500169, 3983500201]
Metal-free organic phosphorescent materials have attracted considerable attention in the fields of organic electronics and bioelectronics. However, it remains a great challenge to achieve organic phosphors with high quantum efficiency in a single-component system. We designed and synthesized two organic phosphors (PDCz and PDBCz) with an ultralong organic phosphorescence (UOP) feature. Both molecules showed ultralong emission lifetime of >200 ms. For PDBCz crystal, it was found that the absolute phosphorescence quantum efficiency reaches up to 38.1%. Combining the experimental and theoretical studies, the highly efficient UOP was mainly attributed to the intramolecular space heavy-metal effect, which facilitates the spin orbit coupling between singlet and triplet excited states to effectively promote the intersystem crossing. This study will provide a new platform to rationally design highly efficient UOP materials and show its potential in the field of flexible electronics.
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