Zinc (II) complexes with Schiff bases obtained from N‐[2‐(cyclohexyliminomethyl)‐ or 2‐(4‐cyclohexylphenyliminomethyl) phenyl]‐4‐methylbenzenesulfonamides and their application as highly luminescent blue emitters for OLEDs

• DOI: 10.1002/aoc.7375
• Publication Date: 2024-01-30T03:39:22Z
• Authors: Anatolii S. Burlov; Yurii V. Koshchienko; Valery G. Vlasenko; Oleg P. Demidov; Bogdan V. Chaltsev; Mikhail A. Kiskin; Dmitrii A. Garnov...; Alexandra A. Kolo...; Alexey N. Gusev; Elena V. Braga; Igor A. Nauhatsky; Wolfgang Linert
• Keywords: 01 natural sciences; 0104 chemical sciences

Two new Schiff base compounds of N ‐{2‐[( E )‐сyclohexyliminomethyl]phenyl}‐4‐methylbenzenesulfonamide, )‐(4‐сyclohexylphenyl)iminomethyl]phenyl}‐4‐methylbenzenesulfonamide and their Zn(II) complexes have been synthesized characterized by elemental analysis, FT‐IR UV–Vis spectra, single crystal X‐ray determination. In both complexes, Zn 2+ ions a tetrahedral environment with two nitrogen atoms the tosylamide groups imine fragment. Time‐dependent density functional theory calculations performed on zinc(II) in order to assign experimental UV–visible absorption bands. Zinc(II) showed thermal stability up 335–340°C under atmosphere thermogravimetric analysis (TGA). The photoluminescent spectra show that solid state at room temperature emit blue luminescence high emission quantum yields 20% 29%. doped devices configurations indium tin oxide (ITO)/poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/ , N′ ‐Di(1‐naphthyl)‐ ‐diphenyl‐(1,1′‐biphenyl)‐4,4′‐diamine (NPD)/4,4′‐ ‐dicarbazolebiphenyl (CBP):Zinc(II) complex (5%)/1,3,5‐tris( ‐phenylbenzimidazole‐2‐yl) benzene (TPBI)/LiF/Al fabricated investigated. device based сyclohexylphenyl substituent ligand best electroluminescent characteristics maximum brightness L max 3415 cd/m 2 current efficiency 2.8 cd/A, power 1.9 lm/W, while emitter сyclohexyl slightly worse electroluminescence (EL) performance 2105 2.1 1.6 lm/W.