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A bipolar triphenylamine-dibenzothiophene S,S-dioxide hybrid compound for solution-processable single-layer green OLEDs and as a host for red emitters

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Abstract

A novel bipolar compound triphenylamine-dibenzothiophene S,S-dioxide (TPAFSO) based on a dibenzothiophene-S,S-dioxide (DBTO) moiety and a triphenylamine (TPA) unit, in which the TPA unit is linked at its 4-position to the DBTO group at its 3,7-position, is designed and synthesized. The experimental results clearly show that TPAFSO exhibits a high photoluminescence efficiency of 0.52 in a film form and good/balanced carrier injecting properties, as well as an adequate triplet energy (ET) of 2.1 eV to sensitize red phosphor. Hence, solution-processable single-layer green OLEDs using TPAFSO as emitters exhibit a maximum luminous efficiency (LE) of 4.7 cd A−1 and a maximum brightness of 5952 cd m−2 with a low turn-on voltage of 2.5 V, which is superior to the performance of double-layer devices. Furthermore, considering the TPAFSO as a solution-processed host for red emitters, 5% bis(2-(2′-benzothienyl)-pyridinato-N,C3′)iridium(acetylacetonate) (Ir(btp)2(acac))-doped single-layer devices give a maximum quantum yield of 3.9% and a saturated red emission with CIE coordinates of (0.68, 0.32), which are much better than that of Ir(btp)2(acac)-doped poly(N-vinylcarbazole)-2-tert-butylphenyl-5-biphenyl-1,3,4-oxadiazole (PVK-PBD) single-layer devices. Additionally, the red OLEDs using 4-(dicyanomethylene)-2-t-butyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4Hpyran (DCJTB)-doped TPAFSO as the emitting layer exhibit a maximum LE of 1.8 cd A−1, and can be compared to the performances of DCJTB/Alq3-based multilayer devices via an evaporation process.

Graphical abstract: A bipolar triphenylamine-dibenzothiophene S,S-dioxide hybrid compound for solution-processable single-layer green OLEDs and as a host for red emitters

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Publication details

The article was received on 30 Jan 2019, accepted on 28 Mar 2019 and first published on 30 Mar 2019


Article type: Paper
DOI: 10.1039/C9NJ00537D
Citation: New J. Chem., 2019, Advance Article

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    A bipolar triphenylamine-dibenzothiophene S,S-dioxide hybrid compound for solution-processable single-layer green OLEDs and as a host for red emitters

    Q. Jiang, Y. Xu, T. Yu, X. Qiu, R. Zhao, D. Zhao, N. Zheng, D. Hu, Z. Xie and Y. Ma, New J. Chem., 2019, Advance Article , DOI: 10.1039/C9NJ00537D

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