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Issue 5, 2017
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Dimethylsilyl-linked anthracene–pyrene dimers and their efficient triplet–triplet annihilation in organic light emitting diodes

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Abstract

New deep blue emitters containing an sp3-hybridised tetrahedral silicon core with dimethyl groups, 9,10-biarylanthracene, and pyrene were synthesised. The pyrene group, with planar π-conjugation and a slightly larger energy gap than that of anthracene, is expected to work as an intramolecular host group in organic light emitting diodes (OLEDs). Density functional theory (DFT-B3LYP) and time-dependent DFT calculations for molecular orbitals and excited states of pyrene and anthracene units showed the possibility of intramolecular energy transfer and a triplet–triplet annihilation (TTA) process. The maximum external quantum efficiencies (EQEs) of non-doped devices using PA1N and PA2N were 4.7% and 4.8%, respectively, while the maximum EQEs of doped devices using PA1N and PA2N as dopants (3 wt%) were 4.5% and 3.6%, respectively. The EQE of the non-doped device with a low photoluminescence quantum yield (PLQY) (14%) was higher than that of the doped device with a high PLQY (74%), which resulted from the existence of a contribution reproducing radiative S1 excitons from nonradiative T1 excitons in the non-doped devices. Both non-doped and doped devices using PA1N and PA2N showed high color pure blue emission. [Commission Internationale de l'Eclairage coordinates, CIE (x, y), of the non-doped device were (0.16, 0.08) for PA1N and (0.15, 0.10) for PA2N.]

Graphical abstract: Dimethylsilyl-linked anthracene–pyrene dimers and their efficient triplet–triplet annihilation in organic light emitting diodes

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Publication details

The article was received on 08 Dec 2016, accepted on 30 Dec 2016 and first published on 30 Dec 2016


Article type: Paper
DOI: 10.1039/C6TC05308D
Citation: J. Mater. Chem. C, 2017,5, 1090-1094

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    Dimethylsilyl-linked anthracene–pyrene dimers and their efficient triplet–triplet annihilation in organic light emitting diodes

    M. J. Sung, H. Chubachi, R. Sato, M. Shin, S. Kwon, Y. Pu and Y. Kim, J. Mater. Chem. C, 2017, 5, 1090
    DOI: 10.1039/C6TC05308D

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