High-mobility hole-transporting polymers for electroluminescence applications

A series of electroluminescent and conductive phenyl ring-substituted poly (N-phenyl-N-styryl-1-naphthylamine) (P-XNPA, where X = -H (P01), -OCH3 (P02) and -F (P03)) polymers were prepared. The polymers exhibit a high hole mobility, an excellent solubility and a good thermal stability. Their emission color, ionization potential (IP), quantum efficiency, glass transition temperature (T-g), efficiency and stability were all found to be related to the properties of the phenyl substituted side group. As an example, the hole mobility of poly(4-MeONPA) (P02) is 10(-5) cm(2)V(-1)s(-1) at room temperature, compared to that of poly (N-vinylcarbazole) (PVK) being 10(-7) cm(2)V(-1)s(-1). P02 emits blue light at 450nm and has a high thermal stability at an onset decomposition temperature above 420 degrees C and T-g of 132 degrees C. A simple organic light-emitting diode (OLED) device fabricated from the same polymer has a maximum luminance of 588 cd/m(2) at 175 mA/cm(2).