Novel dinuclear cyclometalated Platinum(II) complex as orange phosphorescent emitters for single-emitting-layer white polymer light-emitting diodes.

Abstract Novel binuclear platinum complex (FPT) 2 Pt 2 (diPic) and mononuclear platinum complex (FPT)Pt(Pic) were designed and synthesized, where FPT is N-(4-(6-(9,9-diethyl-9H-fluoren-2-yl)pyridin-3-yl)phenyl) N-phenylbenzenamine, diPic is 3-(6-(2-carboxypyridin-3-yloxy)hexyloxy)picolinic acid, and Pic is picolinic acid. The photophysical, electrochemical and thermal properties, as well as electroluminescent (EL) properties for both platinum(II) complexes were studied. Compared to (FPT)Pt(Pic), (FPT) 2 Pt 2 (diPic) exhibited stronger phosphorescent emission in PL spectra and higher Φ PL , owing to the enhanced spin-orbit interaction of platinum centers. Moreover, the monochromatic devices based on (FPT) 2 Pt 2 (diPic) showed better EL properties than (FPT)Pt(Pic). Based on that, the single-emissive-layer WPLEDs using (FPT) 2 Pt 2 (diPic) as orange emitter and FIrpic as blue emitter were also obtained. The WPLEDs show best performances with a maximal LE of 1.3 cd/A, and a CIE coordinates of (0.35, 0.37) which is very close to the pure white emission. Work is still underway to improve the device efficiency and color purity of these iridium and platinum complexes co-doped WPLEDs. Graphical abstract A novel binuclear platinum complex (FPT) 2 Pt 2 (diPic) is designed and synthesized. Both orange and white PLEDs are fabricated with a simple single-emission-layer configuration based on (FPT) 2 Pt 2 (diPic). The WPLEDs combination of (FPT) 2 Pt 2 (diPic) with FIrPic exhibit a CIE coordinates of (0.35, 0.37), which is very close to the pure white color. Image 1 Highlights • Novel binuclear platinum complex and mononuclear platinum complex were synthesized. • Photophysical, electrochemical and thermal properties of Pt complexes were studied. • (FPT) 2 Pt 2 (diPic) exhibited stronger phosphorescent emission and higher Φ PL. • The monochromatic devices based on (FPT) 2 Pt 2 (diPic) show better EL property. • The single-emissive-layer WPLEDs based on (FPT) 2 Pt 2 (diPic) and FIrpic were achieved. [ABSTRACT FROM AUTHOR]