Current Photovoltaic Research ISSN:2288-3274(Print) 2508-125X(Online)

Absorption and luminescence characteristics of disperse red-19 (DR-19) and TiO₂ composite have been investigated with various poling electric field strengths. Two step synthetic processes were employed to employ the DR-19 to the TiO₂ sol-gel. Firstly, urethane bond formation between DR-19 (-OH) and 3-isocyanatopropyl triethoxysilane (ICPTES, -N=C=O) performed (ICPDR) prior incorporation to the TiO₂ sol-gel. Secondary, the hydrolysis of the ethoxy group from the ICPTES and condensation reaction between silanol groups from ICPTES and TiO₂ sol-gel were performed. The ICPDR and TiO₂sol-gel (DRTiO₂) were mixed and stirred for several days. The composite was coated to the ITO coated glass substrate. Corona poling were performed before drying the composite with various electric field strengths. The absorption intensity decreased with the increase of the poling field strength, which resulted in the increase of poling efficiency. The photoluminescence also decreased as the poling field strength increased. There is long luminescence tail for the poled DRTiO2 film compared with unpoled DRTiO2 film. The luminescence long tail indicates that the self-trapped excitons and polarons were generated when the DRTiO2 film was poled with electric field.