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Issue 25, 2016
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Platinum(II) cyclometallates featuring broad emission bands and their applications in color-tunable OLEDs and high color-rendering WOLEDs

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Abstract

Two phosphorescent platinum(II) cyclometallated complexes with phenoxy groups (1 and 2) have been developed. The modified organic ligands derived by combining the phenoxy moiety and 2-phenylpyridine conferred them with a more flexible structure, leading to superior intermolecular interaction properties of the resulting Pt(II) metallophosphors. Because of the excimer formation induced by Pt(II) complexes 1 and 2, the emission color can be tuned over a wide range from cyan to orange by simply increasing the concentration of the Pt(II) metallophosphors. Inspired by their broad emission band, color tunability and outstanding electroluminescence (EL) performance, these two Pt(II) phosphors complemented with blue fluorescent emitter 4,4′-bis(9-ethyl-3-carbazovinylene)-1,1′-biphenyl (BCzVBi) were employed in manufacturing high color-rendering white organic light-emitting devices (WOLEDs). In such simple two-emitter systems, 1-based WOLEDs exhibited reasonable EL performance with an external quantum efficiency (ηext) of 11.7%, luminance efficiency (ηL) of 29.1 cd A−1, power efficiency (ηp) of 16.9 lm W−1 and color rendering index (CRI) of 77, whereas 2-based WOLEDs demonstrated an ηext of 10%, ηL of 21.7 cd A−1, ηp of 10.7 lm W−1 and CRI of 88.

Graphical abstract: Platinum(ii) cyclometallates featuring broad emission bands and their applications in color-tunable OLEDs and high color-rendering WOLEDs

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Publication details

The article was received on 19 Apr 2016, accepted on 21 May 2016 and first published on 23 May 2016


Article type: Paper
DOI: 10.1039/C6TC01594H
Citation: J. Mater. Chem. C, 2016,4, 6016-6026
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    Platinum(II) cyclometallates featuring broad emission bands and their applications in color-tunable OLEDs and high color-rendering WOLEDs

    G. Tan, S. Chen, C. Siu, A. Langlois, Y. Qiu, H. Fan, C. Ho, P. D. Harvey, Y. H. Lo, L. Liu and W. Wong, J. Mater. Chem. C, 2016, 4, 6016
    DOI: 10.1039/C6TC01594H

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