Thermal and spectral stability of electroluminescent hyperbranched copolymers containing tetraphenylthiophene-quinoline-triphenylamine moieties
作者:Ya-Ting Tsai、Chung-Tin Lai、Rong-Hong Chien、Jin-Long Hong、An-Chi Yeh
DOI:10.1002/pola.25020
日期:2012.1.15
Fluorescent hyperbranched copolymers (HB‐x, x = 1–4) with inherent tetraphenylthiophene, triphenylamine (TPA) and quinoline (Qu) moieties were prepared to study the influence of the TPA branching point on the thermal and the spectral stability. All the HB‐x copolymers exhibited high glass transition temperatures (Tgs = 245–315 °C) with the detected values increasing with the increasing branching TPA
制备了具有固有四苯并噻吩,三苯胺(TPA)和喹啉(Qu)部分的荧光超支化共聚物(HB-x,x = 1-4),以研究TPA支化点对热和光谱稳定性的影响。所有HB-x共聚物均表现出较高的玻璃化转变温度(T g s = 245-315°C),检测值随着HB-x中支链TPA含量的增加而增加。固态HB-x薄膜具有高发射效率并具有量子产率(ϕ Fs)的范围是0.72-0.74。更重要的是,HB-x共聚物和衍生的发光器件在高于200°C的温度下对热退火表现出高的光致发光(PL)和电致发光(EL)稳定性。在200°C(或300°C)下退火后,HB-1(或HB-4)共聚物的PL和EL光谱未见变化。发现光谱稳定性与T g相关。HB-4共聚物具有最高的支化密度,在所有HB-xs中具有最高的热稳定性,并且在300°C退火4小时后未显示EL光谱变化。结果表明,由于它们的高量子产率和光谱稳定性,所有支化的HB-x共聚