In 2019,Optical Materials (Amsterdam, Netherlands) included an article by Liang, Aihui; Liu, Zhiqian; Liu, Dewang; Cai, Ping; Wang, Zhiping; Zhou, Wenjing; Hu, Sifan; Tang, Jun; Zhang, Xiaolan; Cai, Mingzhong. COA of Formula: C5H3Br2N. The article was titled 《Novel dinuclear cyclometalated Platinum(II) complex as orange phosphorescent emitters for single-emitting-layer white polymer light-emitting diodes》. The information in the text is summarized as follows:
Novel binuclear platinum complex (FPT)2Pt2(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 photophys., electrochem. and thermal properties, as well as electroluminescent (EL) properties for both platinum(II) complexes were studied. Compared to (FPT)Pt(Pic), (FPT)2Pt2(diPic) exhibited stronger phosphorescent emission in PL spectra and higher ΦPL, owing to the enhanced spin-orbit interaction of platinum centers. Moreover, the monochromatic devices based on (FPT)2Pt2(diPic) showed better EL properties than (FPT)Pt(Pic). Based on that, the single-emissive-layer WPLEDs using (FPT)2Pt2(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. The results came from multiple reactions, including the reaction of 2,5-Dibromopyridine(cas: 624-28-2COA of Formula: C5H3Br2N)
2,5-Dibromopyridine(cas: 624-28-2) belongs to pyridine. Pyridine is very deactivated towards electrophilic substitution with respect to benzene. For this reason classical formylation, using methods such as the Gattermann or Vilsmeier reactions, are not generally successful. COA of Formula: C5H3Br2N