A novel of new charge iridium complexes for organic light-emitting diode and sensor application

This study reported the synthesis of two charge iridium (III) complex series. All of the target complexes were characterized and studied their photophysical and electrochemical properties. In the first series, the complexes used for organic light-emitting geode (OLEDs) were [Ir(spiro)(difluoro)2]PF6 (KM01), [Ir(spiro)(thio)2]PF6 (KM02), [Ir(Spiro)(difluoro)2]PF6 (KM03), and [Ir(spiro)(ppz)2]PF6 (KM04) (spiro was 4,5-diaza-9,9’-spirobifluorene, ppy was 2-phenylpridine, thio was 2-thiophenylpyridine, difluoro was 2’,4’-difluorophenylpyridine, and ppz was 2’,4’-difluorophenyl 1H-pyrazole). Then, KM01-KM04 were fabricated for OLED devices based on ITO/PEDOT:PSS/KM01-KM04:BMIMPF6(1:1 by mole)/TPBi/LiF/Al. It was found that KM01 showed maximum current efficiency at 1.72 cd/A and brightness at 2,027 cd/m2. In the second series, the complexes used for colorimetric n-butylamine sensor were [Ir(L1)(ppy)2]PF6 (NU02) and [Ir(L2)(ppy)2]PF6 (KM09) (L1 was dimenthyl-2,2’-bipyridine-3,3’-dicarboxylate and L2 was dimenthyl-2,2’-bipyridine-4,4’-dicarboxylate). It was found that the color of charge iridium (III) complex changed from red (528 nm) to orange (450 nm) in condition HCl (100 equiv.) and n-butylamine (3 equiv.) after 120 minutes of reaction.