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The methylation effect in prolonging the pure organic room temperature phosphorescence lifetime

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Abstract

Prolonging the phosphorescence lifetime of pure organic phosphorescent materials by a methyl-substitution strategy is described. We present a chemical strategy for improving the phosphorescence lifetime of triplet excitons under ambient conditions by incorporating methyl groups into the chemical structures. This is observed by a long-lived phosphorescence lifetime of up to 0.83 s detected for methylated 9-(4-(mesitylsulfonyl)phenyl)-9H-carbazole (3M), compared to 0.36 s for 9-(4-(phenylsulfonyl)phenyl)-9H-carbazole (0M) without any methyl groups. Additionally, enhanced phosphorescence efficiency can be obtained at an appropriate methylation degree, because of the smaller ΔEST (singlet and triplet energy gap) and ΔETT* (normal phosphorescence and long-lived phosphorescence energy gap). A comprehensive investigation on the packing mode in the crystalline state reveals that the methyl groups occupy the free volume and result in a suppression of non-radiative decay, accounting for the enhanced phosphorescence lifetime.

Graphical abstract: The methylation effect in prolonging the pure organic room temperature phosphorescence lifetime

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Publication details

The article was received on 08 Jul 2018, accepted on 01 Oct 2018 and first published on 08 Oct 2018


Article type: Edge Article
DOI: 10.1039/C8SC03019G
Citation: Chem. Sci., 2018, Advance Article
  • Open access: Creative Commons BY-NC license
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    The methylation effect in prolonging the pure organic room temperature phosphorescence lifetime

    Z. Mao, Z. Yang, Z. Fan, E. Ubba, W. Li, Y. Li, J. Zhao, Z. Yang, M. P. Aldred and Z. Chi, Chem. Sci., 2018, Advance Article , DOI: 10.1039/C8SC03019G

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