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Pyrene-based blue emitters with aggregation-induced emission features for high-performance organic light-emitting diodes

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Abstract

Pyrene is a representative aggregation-caused quenching (ACQ) chromophore. Herein, by introducing tetraphenylethylene or triphenylethylene with a typical aggregation-induced emission (AIE) characteristic at pyrene's 2,7-positions, we have succeeded in converting it into AIE luminogens (AIEgens). The new compounds, namely Py-TPE and Py-TriPE, exhibit strong sky-blue emission (<490 nm) with high quantum yields in both aggregated state and solid state. Non-doped organic light-emitting diodes (OLEDs) using Py-TPE and Py-TriPE as emitters are fabricated. Among them, the device with a configuration of ITO/HATCN (5 nm)/TAPC (40 nm)/TCTA (5 nm)/Py-TPE (20 nm)/Bepp2 (45 nm)/Liq (2 nm)/Al emits sky-blue light at 492 nm at a low turn-on voltage (3.1 V) with a maximum luminance of 15 750 cd m−2, a current efficiency of 7.34 cd A−1, a power efficiency of 6.40 lm W−1 and an external quantum efficiency of 3.19%. The electron transporting and symmetry properties of the present AIEgens are found to play significant roles in improving the luminance of the devices with a low efficiency roll-off. This work thus opens up new avenues for the design of new pyrene-based AIEgens for fabricating blue high-performance OLEDs.

Graphical abstract: Pyrene-based blue emitters with aggregation-induced emission features for high-performance organic light-emitting diodes

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Publication details

The article was received on 05 Nov 2018, accepted on 15 Jan 2019 and first published on 16 Jan 2019


Article type: Paper
DOI: 10.1039/C8TC05547E
Citation: J. Mater. Chem. C, 2019, Advance Article

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    Pyrene-based blue emitters with aggregation-induced emission features for high-performance organic light-emitting diodes

    X. Feng, Z. Xu, Z. Hu, C. Qi, D. Luo, X. Zhao, Z. Mu, C. Redshaw, J. W. Y. Lam, D. Ma and B. Z. Tang, J. Mater. Chem. C, 2019, Advance Article , DOI: 10.1039/C8TC05547E

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