Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs
| Autor: | Nisic, F., Colombo, A., Dragonetti, C., Roberto, D., Valore, A., Malicka, J.M., Cocchi, M., Freeman, G.R., Williams, J.A.G. |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
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| Zdroj: | JOURNAL OF MATERIALS CHEMISTRY C 2 (2014): 1791–1800. doi:10.1039/c3tc32086c info:cnr-pdr/source/autori:Nisic, Filippo; Colombo, Alessia; Dragonetti, Claudia; Roberto, Dominique; Valore, Adriana; Malicka, Joanna M.; Cocchi, Massimo; Freeman, Gemma R.; Williams, J. A. Gareth/titolo:Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs/doi:10.1039%2Fc3tc32086c/rivista:JOURNAL OF MATERIALS CHEMISTRY C/anno:2014/pagina_da:1791/pagina_a:1800/intervallo_pagine:1791–1800/volume:2 Journal of materials chemistry C, 2014, Vol.2(10), pp.1791-1800 [Peer Reviewed Journal] |
| DOI: | 10.1039/c3tc32086c |
| Popis: | Two new pincer proligands, namely 5-(p-(N, N-diphenylamino) phenylethynyl)-1,3-di(2-pyridyl) benzene (HL1) and trans-5-(p-(N, N-diphenylamino) styryl-1,3-di(2-pyridyl) benzene (HL2) were prepared together with their N boolean AND C boolean AND N-coordinated cyclometallated platinum(II) complexes (PtLX)-X-1 (X = Cl, NCS) and (PtLCl)-Cl-2. Both ligands are intensely luminescent in solution (quantum yields > 0.8). (PtLX)-X-1 complexes display high quantum yields in solution whereas that of (PtLCl)-Cl-2 is very low due to the ease with which trans to cis isomerisation of the diphenylaminostyryl C=C bond occurs. Distinct sets of emission bands attributable to the cis and trans forms are observable in glass at 77 K, the assignments being supported by TD-DFT calculations. Organic light-emitting diodes (OLEDs) have been prepared using the new compounds as phosphorescent emitters. Remarkably, despite the inferior quantum yield of (PtLCl)-Cl-2 in solution, the best electroluminescence quantum efficiencies are obtained with this complex, which emerges as an excellent candidate for the preparation of NIR-OLEDs. |
| Databáze: | OpenAIRE |
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