Intermolecular Electronic Coupling of Organic Units for Efficient Persistent Room-Temperature Phosphorescence.

ABSTRACT: Although persistent room-temperature phosphorescence (RTP) emission has been observed for a few pure crystalline organic molecules, there is no consistent mechanism and no universal design strategy for organic persistent RTP (pRTP) materials. A new mechanism for pRTP is presented, based on combining the advantages of different excited-state configurations in coupled intermolecular units, which may be applicable to a wide range of organic molecules. By following this mechanism, we have developed a successful design strategy to obtain bright pRTP by utilizing a heavy halogen atom to further increase the intersystem crossing rate of the coupled units. RTP with a remarkably long lifetime of 0.28?s and a very high quantum efficiency of 5?% was thus obtained under ambient conditions. This strategy represents an important step in the understanding of organic pRTP emission.

SUBMITTER: Yang Z 

PROVIDER: S-EPMC5064736 | biostudies-literature | 2016 Feb

REPOSITORIES: biostudies-literature