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Delayed Fluorescent Emission from Pyrene Doped Phenanthrene Nanoparticles Based on Triplet‐triplet Energy Transfer
Author(s) -
Jiang Ziwen,
Zhao Yongsheng,
Luo Zhixun,
Peng Aidong,
Wang Hao,
Yao Jiannian
Publication year - 2010
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201090349
Subject(s) - pyrene , phenanthrene , chemistry , phosphorescence , photochemistry , fluorescence , energy transfer , singlet state , acceptor , nanoparticle , emission intensity , doping , triplet state , molecule , nanotechnology , organic chemistry , optoelectronics , excited state , chemical physics , atomic physics , materials science , ion , physics , quantum mechanics , condensed matter physics
Doped nanoparticles were prepared from pyrene and phenanthrene using a facile reprecipitation method. The doped nanoparticles presented unique delayed fluorescent emissions of pyrene under the unprotected condition. The ratio of the intensity of delayed fluorescence ( I DF ) to that of phosphorescence ( I P ) is about 4:1, which almost keeps unchanged with the decrease of pyrene content at room temperature. The intensity of the delayed fluorescence emissions is dependent on the relative content of pyrene, as well as the aggregation degree of nanoparticles. The delayed emissions are contributed to efficient triplet‐triplet energy transfer from phenanthrene (donor) to pyrene (acceptor). Steady fluorescence measurement have proved that the singlet‐singlet energy transfer process was also existent dominated by the radiation energy transfer mechanism.