Ortho-Heterofluorene perylenediimides: synthesis, photophysical, and exciton dynamic properties. Issue 48 (28th November 2016)

• Record Type: Journal Article
• Authors: Yu, Zhenyi; Wu, Yi-Shi; Chen, Jianwei; Sun, Chunlin; Fu, Hongbing
• Is Part Of: Physical chemistry chemical physics. Volume 18:Issue 48(2016)
• Page Start: 32678
• Page End: 32681
• Publication Date: 2016-11-28
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c6cp04930c
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : We designed heavy-atom-free perylenediimides (PDIs) to prompt the intersystem crossing (ISC) by introducing electron donating heterofluorene groups at the head positions of electron-deficient PDI core. Abstract : Previous studies suggest the perylenediimide (PDI) triplet excited state (T1 ) have been accessible only through bimolecular sensitization, the internal heavy-atom effect or a sophisticated cascade of nonradiative processes. Here, we designed heavy-atom-free PDIs to prompt the T n ← S1 intersystem crossing (ISC) by introducing electron donating heterofluorene groups at the head positions of the electron-deficient PDI core. We obtained relatively high ISC efficiency up to 92% yield. Furthermore, promptly generated PDI triplets can sensitize the molecular oxygen quantitatively to yield 1 O2, with singlet oxygen generation efficiencies ( Φ Δ ) near to unity. These results further suggest that the ISC process of PDIs can be enhanced through the intramolecular charge transfer (ICT) interaction, providing guidelines for developing triplet-generating PDIs and related rylene diimides for optoelectronic applications.