Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 124, Issue 18, Pages 10129-10134Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c01762
Keywords
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Funding
- National Natural Science Foundation of China [21772095, 61875090, 91833306]
- Key giant project of Jiangsu Educational Committee [19KJA180005]
- fifth 333 project of Jiangsu Province of China [BRA2019080]
- 1311 Talents Program of Nanjing University of Posts and Telecommunications (Dingshan)
- Six Talent Plan [2016XCL050]
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Organic ultralong room-temperature phosphorescence (OURTP) has boomed recent advances of organic optoelectronics with the significant breakthrough in facilitating the intersystem crossing and stabilization of triplet excitons of purely organic materials. However, it remains a challenge in revealing the inherent mechanism of OURTP and the general molecular design principles of OURTP materials have yet to be reached, largely owing to the rather complicated and varied OURTP molecular structures. Here, we propose a facile strategy to design efficient OURTP materials by simply introducing a cyano group (CN) on benzene. On the basis of these very simple OURTP molecules, it was found that the simultaneously enhanced intersystem crossing and aggregation coupling are two intrinsic prerequisites in realizing the efficient OURTP. The first observation of the excimer emission from the stabilized singlet excited states offers an important evidence for the mechanism study of OURTP, and the direct CN substitution on the benzene ring would be highly instructive for designing efficient OURTP molecules.
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