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Issue 41, 2018
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A simple D–π–A hybrid mode for highly efficient non-doped true blue OLEDs with CIEy < 0.05 and EQE up to 6%

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Abstract

Although great advances have been achieved in organic electroluminescence fields, highly efficient true blue organic electroluminescence with small CIE coordinates and satisfactory color purity are still limited. Here, we practise a simple and effective molecular avenue for true blue organic electroluminescence, and the strategy is to use biphenyl-bridging hybrids of 1,2,4-triazoles (acceptors) and various donors (D) as the emitters. The as-prepared D–π–A hybrid (TPATZ) containing 2,3,4-triphenyl-1,2,4-triazole and triphenylamine emits bright blue light both in solution and in the solid state, and the non-doped device with TPATZ as an emitter exhibits true blue electroluminescence (EL) with the emission peak at 430 nm and the Commission Internationale de L’Eclairage coordinates of (0.155, 0.047). Moreover, the satisfactory EL color purity with the full width at half maximum (FWHM) of only 50 nm and the maximum external quantum efficiency of 5.92% is obtained, which is among the best true blue OLEDs reported to date. These impressive EL properties are experimentally and theoretically analyzed and emphasize that this simple D–π–A hybrid mode is an effective molecular strategy for highly efficient true blue EL emitters.

Graphical abstract: A simple D–π–A hybrid mode for highly efficient non-doped true blue OLEDs with CIEy < 0.05 and EQE up to 6%

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Publication details

The article was received on 30 Jul 2018, accepted on 10 Sep 2018 and first published on 11 Sep 2018


Article type: Paper
DOI: 10.1039/C8TC03777A
Citation: J. Mater. Chem. C, 2018,6, 11063-11070
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    A simple D–π–A hybrid mode for highly efficient non-doped true blue OLEDs with CIEy < 0.05 and EQE up to 6%

    J. Shi, Q. Ding, L. Xu, X. Lv, Z. Liu, Q. Sun, Y. Pan, S. Xue and W. Yang, J. Mater. Chem. C, 2018, 6, 11063
    DOI: 10.1039/C8TC03777A

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