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| Highly electron-rich triarylamines, which are known to have high hole mobility, have been widely used as hole-transporting materials in multilayer organic electro-luminescence devices.5 However, triphenylamine (TPA) derivatives have the tendency to crystallize upon exposure to heat resulting in aggregation-induced fluorescence quenching of fluorophores, and often possess low glass transition temperatures (Tg)(i.e., poor morphological stability), resulting in low reliability when used in optoelectronic devices. Aggregation quenching and lowTg are the major reasons for the rare use of TPA derivatives for layer emission in electroluminescent device applications. |
至尊木蟲 (知名作家)
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| 已知高度富含電子的三芳基胺具有高空穴遷移率,已經(jīng)被廣泛地用作多層結(jié)構(gòu)的有機電致發(fā)光器件的空穴傳輸材料。 然而,三苯胺(TPA)的衍生物在暴露于熱時具有結(jié)晶化趨勢,引起熒光團的聚集誘導(dǎo)的熒光淬滅,并且常常具有低玻璃化轉(zhuǎn)變溫度(Tg)(即,形態(tài)穩(wěn)定性差),在光電器件中使用時可靠性低。聚集淬火和低Tg是在電致發(fā)光器件中很少應(yīng)用到TPA衍生物為層發(fā)光的主要原因。 |
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