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New Oxazoline- and Thiazoline-Containing Heteroleptic Iridium(III) Complexes for Highly-Efficient Phosphorescent Organic Light-Emitting Devices (PhOLEDs): Colour Tuning by Varying the Electroluminescence Bandwidth

Chao, Kai; Shao, Kuizhan; Peng, Tai; Zhu, Dongxia; Wang, Yue; Liu, Yu; Sua, Zhongmin; Bryce, Martin R.

New Oxazoline- and Thiazoline-Containing Heteroleptic Iridium(III) Complexes for Highly-Efficient Phosphorescent Organic Light-Emitting Devices (PhOLEDs): Colour Tuning by Varying the Electroluminescence Bandwidth Thumbnail


Authors

Kai Chao

Kuizhan Shao

Tai Peng

Dongxia Zhu

Yue Wang

Yu Liu

Zhongmin Sua



Abstract

Two new homologous phosphorescent iridium complexes, bis-(2-phenylpyridine)(2-(2′-hydroxyphenyl)-2-oxazoline)iridium(III) [(ppy)2Ir(oz)] (1) and bis-(2-phenylpyridine)(2-(2′-hydroxyphenyl)-2-thiazoline)iridium(III) [(ppy)2Ir(thoz)] (2), have been obtained in good yields and characterized by single-crystal X-ray diffraction, cyclic voltammetry, photoluminescence and electroluminescence studies, and by time-dependent density functional theory (TD-DFT) calculations. Using the two complexes, which differ only by the heteroatom (O or S) substitution at the same site in the ancillary ligand, as the emitter, doped in a 4,4′-bis(N-carbazolyl)biphenyl (CBP) host, gave phosphorescent organic light-emitting diodes (PhOLEDs) with very efficient green and yellow emission, respectively. The turn-on voltages for both devices are low (3.5–3.7 V). The green-emitting (ppy)2Ir(oz) – based device has a maximum brightness of 61560 cd m−2 (at 16 V); maximum luminance efficiency of 66.2 cd A−1, 17.1% external quantum efficiency, 54 lm W−1 power efficiency and CIE coordinates of (0.35, 0.61) at a brightness of 10000 cd m−2. For the yellow-emitting (ppy)2Ir(thoz)-based device with a wide full spectral width at half maximum (FWHM) of 110 nm, the corresponding values are 21350 cd m−2 (at 14.5 V); 27.0 cd A−1, 8.5%, 18.0 lm W−1 and CIE coordinates of (0.46, 0.50). Colour tuning is primarily a consequence of the significantly wider emission bandwidth of complex 2 compared to complex 1.

Citation

Chao, K., Shao, K., Peng, T., Zhu, D., Wang, Y., Liu, Y., …Bryce, M. R. (2013). New Oxazoline- and Thiazoline-Containing Heteroleptic Iridium(III) Complexes for Highly-Efficient Phosphorescent Organic Light-Emitting Devices (PhOLEDs): Colour Tuning by Varying the Electroluminescence Bandwidth. Journal of Materials Chemistry C Materials for optical and electronic devices, 1(41), 6800-6806. https://doi.org/10.1039/c3tc31463d

Journal Article Type Article
Publication Date Nov 7, 2013
Deposit Date Nov 24, 2014
Publicly Available Date Mar 29, 2024
Journal Journal of Materials Chemistry C Materials for optical and electronic devices
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 1
Issue 41
Pages 6800-6806
DOI https://doi.org/10.1039/c3tc31463d

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