CNR ExploRA

Articolo in rivista, 2022, ENG, 10.1039/D2DT01792J

Introduction of a triphenylamine substituent on pyridyl rings as a springboard for a new appealing brightly luminescent 1, 3-di-(2-pyridyl) benzene platinum (ii) complex family

Alessia Colombo, Giulia De Soricellis, Francesco Fagnani, Claudia Dragonetti, Massimo Cocchi, Bertrand Carboni, Véronique Guerchais, Daniele Marinotto

Dipartimento di Chimica, Università degli Studi di Milano, UdR INSTM di Milano, via C. Golgi 19, 20133 Milan, Italy Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), via P. Gobetti 101, 40129 Bologna, Italy Université de Rennes 1, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France Istituto di Scienze e Tecnologie Chimiche (SCITEC) "Giulio Natta", Consiglio Nazionale delle Ricerche (CNR), via C. Golgi 19, 20133 Milan, Italy

The preparation and characterization of three new complexes, namely [Pt(1,3-bis(4-triphenylamine-pyridin-2-yl)-4,6-difluoro-benzene)Cl] ([PtL1Cl]), [Pt(1,3-bis(4-triphenylamine-pyridin-2-yl)-5-triphenylamine-benzene)Cl] ([PtL2Cl]), and [Pt(1,3-bis(4-triphenylamine-pyridin-2-yl)-5-mesityl-benzene)Cl] ([PtL3Cl]), is reported. All of them are highly luminescent in dilute deaerated dichloromethane solution (?lum = 0.88-0.90, in the yellow-green region; the ?max,em in nm for the monomers are: 562, 561 and 549 for [PtL1Cl], [PtL2Cl] and [PtL3Cl], respectively).[PtL1Cl] is the most appealing, being characterized by a very long lifetime (103.9 ?s) and displaying intense NIR emission in concentrated deaerated solution (?lum = 0.66) with essentially no "contamination" by visible light < 600 nm. This complex allows the fabrication of both yellow-green and deep red/NIR OLEDs; OLED emissions are in the yellow-green (CIE = 0.38, 0.56) and deep red/NIR (CIE = 0.65, 0,34) regions, for [PtL1Cl] 8 wt% (with 11% ph/e EQE) and pure [PtL1Cl] (with 4.3% ph/e EQE), respectively.

Dalton Transaction 51 , pp. 12161–12169