Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 28, Issue 9, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201705045
Keywords
high phosphorescence efficiency; organic crystal; organic semiconductors; pi-type halogen bonding; ultralong organic phosphorescence
Categories
Funding
- National Natural Science Foundation of China [51673095, 61505078, 21601086]
- National Basic Research Program of China (973 Program) [2015CB932200]
- Natural Science Foundation [BK20150962, BK20160994]
- Natural Science Fund for Colleges and Universities [17KJB430020]
- High-Level Talents in Six Industries of Jiangsu Province [XCL-025]
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Efficient ultralong organic phosphorescent materials have potential applications in some fields, such as bioimaging, anti-counterfeiting, and sensors. Nevertheless, phosphorescence efficiencies of metal-free organic materials are low due to weak spin-orbit coupling and vigorous nonradiative transitions under ambient conditions. Here a chemical strategy to improve phosphorescence efficiency with intermolecular p-type halogen bonding construction via isomerism is presented. X-ray single crystal analysis reveals that different halogen bonding is formed among p-BrTCz, m-BrTCz, and o-BrTCz crystals. Phosphorescence efficiency of m-BrTCz in solid can reach 13.0%, seven times of o-BrTCz in solid owing to effective p-type halogen bonding, which is further confirmed by theoretical calculations. However, ultralong phosphorescence lifetimes are little affected, 155, 120, and 156 ms for p-BrTCz, m-BrTCz, and o-BrTCz in the solid state, respectively. Furthermore, a simple pattern for data encryption and decryption is first demonstrated under sunlight. This result will provide an approach for improving the phosphorescent efficiency of metal-free organic phosphors with ultralong luminescence.
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