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Sterically Hindered Luminescent Pt II –Phosphite Complexes for Electroluminescent Devices
Author(s) -
Mydlak Mathias,
Yang ChengHan,
Polo Federico,
Galstyan Anzhela,
Daniliuc Constantin G.,
Felicetti Michael,
Leonhardt Jens,
Strassert Cristian A.,
De Cola Luisa
Publication year - 2015
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201405839
Subject(s) - steric effects , ligand (biochemistry) , electroluminescence , chromophore , chemistry , luminescence , photochemistry , denticity , excited state , intermolecular force , crystallography , stereochemistry , molecule , crystal structure , materials science , organic chemistry , biochemistry , receptor , optoelectronics , layer (electronics) , physics , nuclear physics
Pt II complexes with one bulky, sterically demanding, tertiary phosphite ancillary ligand and a coordinating chromophore are herein presented. The phosphite ligand, tris(2,4‐di‐ tert ‐butylphenyl) acts as a bidentate ligand coordinating the platinum ion through the central phosphorus atom and a cyclometalating carbon atom of one of the substituents. The two free phenoxy moieties lie above and below the coordination plane, leading to steric hindrance that avoids aggregation and provides solubility in organic solvents. The other two coordination sites on the central metal ion are occupied by a chromophoric ligand, which is responsible for the energy of the luminescent excited state. This separation of functions, on the two coordinated ligands, allows the use of a wider range of luminophores with good luminescent properties, maintaining the control of the intermolecular interactions with the non‐chromophoric ligand. Based on this approach we were able to achieve a bright deep blue emission ( λ =444 nm, Φ em =0.38) from a complex with a tailored ligand, which was then used for the fabrication of an electroluminescent device. In addition commercially available luminophores were also employed to synthesize green emitters.