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Synergistic effects of hydrogen bonds and the hybridized excited state observed for high-efficiency, deep-blue fluorescent emitters with narrow emission in OLED applications

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Abstract

Efficient deep-blue fluorescence and high color purity (narrow emission) are highly desired characteristics for organic light-emitting diodes (OLEDs). Herein, we report on hydrogen-bond (H-bond)-induced narrow emission based on a donor–acceptor-type molecule TPA-PPI-OH with a hydroxyl (–OH) substituent. Nuclear magnetic resonance (NMR) spectroscopy and single X-ray crystal data indicated the existence of intra- and intermolecular H-bonds interactions in TPA-PPI-OH. These interactions proved beneficial to suppress the structural vibrations and thereby caused a narrower full-width at half-maximum (FWHM) PL emission of TPA-PPI-OH compared to its hydroxy-free counterpart TPA-PPI (57 nm vs. 63 nm in film). The photophysical properties revealed that the lowest excited state (S1) of TPA-PPI-OH is a hybridized local and charge-transfer excited state; thus, TPA-PPI-OH could show high fluorescence efficiencies in various solvents (50% even in acetonitrile). The non-doped deep-blue device based on TPA-PPI-OH exhibited a maximum EQE of 7.37% with a small efficiency roll-off (7.37% @ 100 cd m−2; 5.48% @ 1000 cd m−2) and narrow FWHM of 58 nm (71 nm for TPA-PPI).

Graphical abstract: Synergistic effects of hydrogen bonds and the hybridized excited state observed for high-efficiency, deep-blue fluorescent emitters with narrow emission in OLED applications

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Publication details

The article was received on 20 Jan 2019, accepted on 01 Apr 2019 and first published on 03 Apr 2019


Article type: Paper
DOI: 10.1039/C9TC00357F
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Synergistic effects of hydrogen bonds and the hybridized excited state observed for high-efficiency, deep-blue fluorescent emitters with narrow emission in OLED applications

    X. Qiu, Y. Xu, C. Wang, M. Hanif, J. Zhou, C. Zeng, Y. Li, Q. Jiang, R. Zhao, D. Hu and Y. Ma, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C9TC00357F

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