Literature DB >> 24143268

Magnetic Field Effects on Triplet-Triplet Annihilation in Solutions: Modulation of Visible/NIR Luminescence.

Tomoyasu Mani1, Sergei A Vinogradov.   

Abstract

Photon upconversion based on sensitized triplet-triplet annihilation (TTA) presents interest for such areas as photovoltaics and imaging. Usually energy upconversion is observed as p-type delayed fluorescence from molecules whose triplet states are populated via energy transfer from a suitable triplet donor, followed by TTA. Magnetic field effects (MFE) on delayed fluorescence in molecular crystals are well known; however, there exist only a few examples of MFE on TTA in solutions, and all of them are limited to UV-emitting materials. Here we present MFE on TTA-mediated visible and near infrared (NIR) emission, sensitized by far-red absorbing metalloporphyrins in solutions at room temperature. In addition to visible delayed fluorescence from annihilator, we also observed NIR emission from the sensitizer, occurring as a result of triplet-triplet energy transfer back from annihilator, termed "delayed phosphorescence". This emission also exhibits MFE, but opposite in sign to the annihilator fluorescence.

Entities:  

Keywords:  Delayed Phosphorescence; Magnetic Field Effects; Porphyrin; Spin Dynamics; Tetrabenzoporphyrin; Triplet-Triplet Annihilation; p-type Delayed Fluorescence

Year:  2013        PMID： 24143268      PMCID： PMC3798157          DOI： 10.1021/jz401342b

Source DB:  PubMed          Journal:  J Phys Chem Lett        ISSN： 1948-7185            Impact factor:   6.475


  14 in total

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