Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, USA.
Phys Chem Chem Phys. 2013 Mar 14;15(10):3504-9. doi: 10.1039/c2cp43680a. Epub 2013 Jan 30.
We present electrogenerated chemiluminescence (ECL) and photoluminescence (PL) characteristics of poly(3-hexylthiophene-2,5-diyl) (P3HT) thin films incorporated with monodisperse TiO(2) nanoparticles prepared using a hydrothermal reaction in the presence of oleylamine and oleic acid. The ECL turn-on potential decreases in the presence of TiO(2) nanocrystals, accompanied with an increase in ECL intensity. Only a minor ECL quantum efficiency decrease is obtained in the presence of <40 wt% TiO(2), indicating the formation of an effective interpenetrating network of TiO(2) and disordering of polymer packing to allow the ECL coreactant to transport through the film for efficient electroluminescence. In contrast, PL quenching increases with the weight percentage of TiO(2) and significant PL quenching is obtained when the P3HT film contains up to 80 wt% TiO(2) due to charge transfer. Polaron absorption after the photoinduced charge separation in the presence of 80 wt% TiO(2) nanoparticles is significantly enhanced with longer-lived lifetimes of >1000 ps in contrast to the neat P3HT film. The absorption of polarons created at the P3HT-TiO(2) interface is found to increase with the P3HT-TiO(2) interfacial area per unit volume.
我们展示了聚（3-己基噻吩-2,5-二基）（P3HT）薄膜的电致化学发光（ECL）和光致发光（PL）特性，该薄膜掺入了使用水热反应在油胺和油酸存在下制备的单分散 TiO(2)纳米粒子。存在 TiO(2)纳米晶体时，ECL 开启电位降低，同时 ECL 强度增加。在存在 <40wt%TiO(2)的情况下，仅获得少量 ECL 量子效率降低，表明形成了 TiO(2)的有效互穿网络和聚合物堆积的无序，允许 ECL 共反应物通过薄膜传输以实现有效的电致发光。相比之下，PL 猝灭随 TiO(2)的重量百分比增加而增加，当 P3HT 薄膜含有高达 80wt%TiO(2)时，由于电荷转移而导致显著的 PL 猝灭。与纯 P3HT 薄膜相比，在存在 80wt%TiO(2)纳米粒子的情况下，在光致电荷分离后，极化子吸收明显增强，寿命超过 1000ps。在 P3HT-TiO(2)界面处创建的极化子的吸收被发现随单位体积的 P3HT-TiO(2)界面面积的增加而增加。
