Robust phosphorescent platinum(ii) complexes with tetradentate O∧N∧C∧N ligands: high efficiency OLEDs with excellent efficiency stabilityElectronic supplementary information (ESI) available: Experimental procedures, X-ray structures of 2 and 3, device performance. CCDC 830685 and 907730. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c2cc37862k

• Main Authors: Kui, Steven C. F, Chow, Pui Keong, Cheng, Gang, Kwok, Chi-Chung, Kwong, Chun Lam, Low, Kam-Hung, Che, Chi-Ming
• Format: Article
• Language: English
• ISSN: 1359-7345; 1364-548X
• DOI: 10.1039/c2cc37862k

The Pt( ii ) complexes ( 1-3 ) bearing tetradentate O ∧ N ∧ C ∧ N ligands display high emission quantum yields (0.76-0.90) and good thermal stability ( T d > 400 °C). Complex 3 is an excellent green phosphorescence dopant for OLEDs with excellent efficiency and low efficiency roll-off ( η L , η Ext (max) = 66.7 cd A −1 , 18.2%; η L , η Ext (1000 cd m −2 ) = 65.1 cd A −1 , 17.7%). Robust Pt( ii ) complexes [Pt(O ∧ N ∧ C ∧ N)] ( 1-3 ) are excellent green phosphorescence dopant for OLEDs with efficiency up to 66.7 cd A −1 (18.2%) and low efficiency roll-off (2.4% @ 1000 cd m −2 ).