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Issue 37, 2013
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Photophysical properties and OLED performance of light-emitting platinum(II) complexes

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The synthesis, photophysical properties and application as emitters in solution-processed multi-layer organic light-emitting diodes (OLEDs) of a series of blue-green to red light-emitting phosphorescent platinum(II) complexes are reported. These complexes consist of phenylisoquinoline, substituted phenylpyridines or tetrahydroquinolines as C^N cyclometalating ligands and dipivaloylmethane as an ancillary ligand. Depending on both the structure of the C^N cyclometalating ligands and the dopant concentration in the matrix, these platinum(II) complexes exhibit different aggregation tendencies. This property affects the photoluminescence spectra of the investigated compounds and colour-stability of the fabricated OLEDs. Using the blue-green to yellow-green emitting complexes, the best results were obtained with the 2-(4-trifluoromethylphenyl)-5,6,7,8-tetrahydroquinoline based platinum(II) complex. A maximum luminous efficiency of 4.88 cd A−1 and a power efficiency of 4.65 lm W−1, respectively, were achieved. Employing the red emitting phenylisoquinoline based complex as an emitter, colour-stable and efficient (4.71 cd A−1, 5.12 lm W−1) devices were obtained.

Graphical abstract: Photophysical properties and OLED performance of light-emitting platinum(ii) complexes

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The article was received on 05 Feb 2013, accepted on 09 Jul 2013 and first published on 30 Jul 2013

Article type: Paper
DOI: 10.1039/C3DT50364J
Citation: Dalton Trans., 2013,42, 13612-13621
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    Photophysical properties and OLED performance of light-emitting platinum(II) complexes

    D. Kourkoulos, C. Karakus, D. Hertel, R. Alle, S. Schmeding, J. Hummel, N. Risch, E. Holder and K. Meerholz, Dalton Trans., 2013, 42, 13612
    DOI: 10.1039/C3DT50364J

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