Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs

Nisic, F.; Colombo, A.; Dragonetti, C.; Roberto, D.; Valore, A.; Malicka, J.M.; Cocchi, M.; Freeman, G.R.; Williams, J.A.G.

doi:10.1039/c3tc32086c

Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs

Nisic, F.; Colombo, A.; Dragonetti, C.; Roberto, D.; Valore, A.; Malicka, J.M.; Cocchi, M.; Freeman, G.R.; Williams, J.A.G.

Authors

F. Nisic

A. Colombo

C. Dragonetti

D. Roberto

A. Valore

J.M. Malicka

M. Cocchi

G.R. Freeman

Professor Gareth Williams j.a.g.williams@durham.ac.uk
Professor

Abstract

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^C^N-coordinated cyclometallated platinum(II) complexes PtL1X (X = Cl, NCS) and PtL2Cl. Both ligands are intensely luminescent in solution (quantum yields > 0.8). PtL1X complexes display high quantum yields in solution whereas that of PtL2Cl is very low due to the ease with which trans to cis isomerisation of the diphenylaminostyryl C[double bond, length as m-dash]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 PtL2Cl in solution, the best electroluminescence quantum efficiencies are obtained with this complex, which emerges as an excellent candidate for the preparation of NIR-OLEDs.

Citation

Nisic, F., Colombo, A., Dragonetti, C., Roberto, D., Valore, A., Malicka, J., …Williams, J. (2014). Platinum(II) complexes with cyclometallated 5-pi-delocalized-donor-1,3-di(2-pyridyl)benzene ligands as efficient phosphors for NIR-OLEDs. Journal of Materials Chemistry C Materials for optical and electronic devices, 2(10), 1791-1800. https://doi.org/10.1039/c3tc32086c

Journal Article Type	Article
Publication Date	Mar 14, 2014
Deposit Date	Jan 17, 2014
Publicly Available Date	Jul 28, 2014
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	2
Issue	10
Pages	1791-1800
DOI	https://doi.org/10.1039/c3tc32086c