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Issue 24, 2015
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Visible room-temperature phosphorescence of pure organic crystals via a radical-ion-pair mechanism

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Abstract

The afterglow of phosphorescent compounds can be distinguished from background fluorescence and scattered light by a time-resolved observation, which is a beneficial property for bioimaging. Phosphorescence emission accompanies spin-forbidden transitions from an excited singlet state through an excited triplet state to a ground singlet state. Since these intersystem crossings are facilitated usually by the heavy-atom effect, metal-free organic solids are seldom phosphorescent, although these solids have recently been refurbished as low-cost, eco-friendly phosphorescent materials. Here, we show that crystalline isophthalic acid exhibits room-temperature phosphorescence with an afterglow that lasts several seconds through a nuclear spin magnetism-assisted spin exchange of a radical ion pair. The obvious afterglow that facilitates a time-resolved detection and the unusual phosphorescence mechanism that enables emission intensification by nuclear spin managements are promising for exploiting the phosphorescence materials in novel applications such as bioimaging.

Graphical abstract: Visible room-temperature phosphorescence of pure organic crystals via a radical-ion-pair mechanism

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Publication details

The article was received on 28 Feb 2015, accepted on 13 May 2015 and first published on 13 May 2015


Article type: Paper
DOI: 10.1039/C5CP01203A
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Citation: Phys. Chem. Chem. Phys., 2015,17, 15989-15995
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    Visible room-temperature phosphorescence of pure organic crystals via a radical-ion-pair mechanism

    S. Kuno, H. Akeno, H. Ohtani and H. Yuasa, Phys. Chem. Chem. Phys., 2015, 17, 15989
    DOI: 10.1039/C5CP01203A

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