Synergistic effects of hydrogen-bonds and hybridized excited-state observed for high efficiency, deep-blue fluorescent emitter with narrow emission in OLED applications - Journal of Materials Chemistry C (RSC Publishing)

Synergistic effects of hydrogen-bonds and hybridized excited-state observed for high efficiency, deep-blue fluorescent emitter with narrow emission in OLED applications - Journal of Materials Chemistry C (RSC Publishing) Efficient deep-blue fluorescent and high color purity (narrow emission) are highly desired characteristics for the organic light-emitting diodes (OLEDs). Herein, we report the hydrogen-bonds (H-bonds) 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 existence of intra- and intermolecular H-bonds interactions in TPA-PPI-OH. These interactions proved beneficial to suppress the structural vibrations thereby caused narrower full-width at half-maximum (FWHM) PL emission of TPA-PPI-OH as compared with 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 showed 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 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). The article wasreceived on 20 Jan 2019,accepted on 01 Apr 2019andfirst published on 03 Apr 2019 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, Accepted Manuscript, DOI: 10.1039/C9TC00357F If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you mustformally request permission using Copyright Clearance Center. Go to ourInstructions for using Copyright Clearance Center page for details. Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. Reproduced material should be attributed as follows: For reproduction of material from NJC: Reproduced from Ref. XX with permission from the Centre National de la Recherche Scientifique (CNRS) and The Royal Society of Chemistry. For reproduction of material from PCCP: Reproduced from Ref. XX with permission from the PCCP Owner Societies. For reproduction of material from PPS: Reproduced from Ref. XX with permission from the European Society for Photobiology, the European Photochemistry Association, and The Royal Society of Chemistry. For reproduction of material from all other RSC journals and books: Reproduced from Ref. XX with permission from The Royal Society of Chemistry. If the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from". In all cases the Ref. XX is the XXth reference in the list of references. If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. contained in this article in third party publications or in a thesis or dissertation provided that the correct acknowledgement is given with the reproduced material. Reproduced material should be attributed as follows: For reproduction of material from NJC: [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC For reproduction of material from PCCP: [Original citation] - Reproduced by permission of the PCCP Owner Societies For reproduction of material from PPS: [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC For reproduction of material from all other RSC journals: [Original citation] - Reproduced by permission of The Royal Society of Chemistry If you are the author of this article you still need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation. Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.



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