Organic light emitting diodes based on a novel red material

In this paper, a novel red luminescent material N,N-bis-[4-[2-(4-dicyanomethylene-6-methyl-4H-pyran-2-yl) ethylene]aniline (BDCM) with two electron-acceptor moieties (4-dicyanomethylene ) pyran and an electron donor moiety triphenylamine for application in organic light emitting diodes (OLED) was reported. The resultant compound has a sterical ly well hindered structure and a high fluorescence yield. Its photoluminescence (PL) of this compound in solid film and electroluminescence (EL) have been stud ied. Based on its intense sterically hindered structure, the pure BDCM film prep ared shows a bright red PL emission. The OLED with a structure of indium tin oxi de (ITO)/copper phthalocyanine (CuPc)/ 1,3 diphenyl 5 (1 phenanthreneyl) 2 pyrazoline(DPPP)/BDCM/Mg∶Ag shows a bright red emission and a brightness of 5 82cd/m 2 at a driving voltage of 19V, which suggests that BDCM has excellent el ectron transport and emitting properties. And it can be found that CIE chromatic ity coordinates of the device were nearly unchanged with increasing current dens ity.