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Issue 14, 2014
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Highly efficient single-layer organic light-emitting devices based on a bipolar pyrazine/carbazole hybrid host material

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Abstract

Organic light-emitting diodes (OLEDs) have attracted tremendous interest and have already become a prevalent technology in MP3 players, smartphones and cameras. In response to the calls for the large-scale application of OLEDs, the complicated and costly processes for preparing a device is a major challenge which should be addressed. Herein, a novel bipolar host material, 26PyzCz, which contains a pyrazine/carbazole hybrid, has been designed and synthesized. 26PyzCz-based single-layer (SL) fluorescent (F)–phosphorescent (P) OLEDs with various colors have been successfully fabricated. Green and orange SL phosphorescent OLEDs (PHOLEDs) have exhibited efficiencies as high as 63.3 and 62.1 cd A−1 at 1000 cd m−2, and 55.7 and 53.8 cd A−1 at 10 000 cd m−2, respectively. Meanwhile, a SL warm white OLED based on fluorescent blue and phosphorescent orange has demonstrated excellent performance, with a maximum current efficiency of 27.5 cd A−1 and a maximum power efficiency of 21.6 lm W−1. In addition, the charge carrier behavior have been evaluated by impedance spectroscopy, which revealed that the dopant trapping effect plays a critical role in charge balance and exciton generation in the SL PHOLEDs.

Graphical abstract: Highly efficient single-layer organic light-emitting devices based on a bipolar pyrazine/carbazole hybrid host material

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Publication details

The article was received on 22 Nov 2013, accepted on 14 Jan 2014 and first published on 15 Jan 2014


Article type: Paper
DOI: 10.1039/C3TC32301C
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. C, 2014,2, 2488-2495
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    Highly efficient single-layer organic light-emitting devices based on a bipolar pyrazine/carbazole hybrid host material

    Y. Liu, L. Cui, M. Xu, X. Shi, D. Zhou, Z. Wang, Z. Jiang and L. Liao, J. Mater. Chem. C, 2014, 2, 2488
    DOI: 10.1039/C3TC32301C

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