A novel red luminescent material N,N-bis4-[2-(4-dicyanomethylene-6-methyl-4H-pyran-2-yl)ethylene]phenyl}aniline (BDCM) with two (4-dicyanomethylene)-4H-pyran electron-acceptor moieties and a triphenylamine electron-donor moiety for application in organic light-emitting diodes (OLEDs) was synthesized. The resultant compound has a sterically well-hindered structure and a high fluorescence yield. The photoluminescence (PL) of this compound in solution and solid film and the electroluminescence (EL) have been studied. Based on its intense sterically hindered structure, the pure BDCM film prepared shows a bright red PL emission. The three-layered EL device with the structure ITO/CuPc/DPPhP/BDCM/Mg:Ag has a turn-on voltage of less than 4 V, which suggests that BDCM has an excellent electron injection property. A bright luminance of 582 cd m−2
is obtained for the device at 19 V.
一种新型红色
发光材料N,N-双4-[2-(4-二
氰基亚甲基-6-甲基-
4H-吡喃-2-基)
乙烯]苯基}
苯胺(BDCM)被合成出来,它具有两个(4-二
氰基亚甲基)-
4H-吡喃电子受体基团和一个
三苯胺电子供体基团,可用于有机发光二极管(OLED)。所得化合物具有空间位阻结构和高荧光产率。该化合物在溶液和固体薄膜中的光致发光(PL)以及电致发光(EL)特性已经过研究。基于其强烈的空间位阻结构,制备的纯BDCM薄膜显示出明亮的红色PL发射。三层EL器件的结构为ITO/CuPc/
DPPhP/BDCM/Mg:Ag,其导通电压小于4 V,这表明BDCM具有优异的电子注入特性。在19 V时,该器件的亮度为582 cd m−2。