Organic Electronics ( IF 3.2 ) Pub Date : 2020-03-21 , DOI: 10.1016/j.orgel.2020.105724 Cho long Kim , Won Jae Chung , Jun Yeob Lee
Molecular design of the hole transport type host for mixed host was investigated to improve the lifetime of the phosphorescent organic light-emitting diodes. A negative polaron stabilizing hole transport type host design was employed and the effect of the negative polaron stabilizing unit was investigated. Dibenzofuran or benzonitrile was introduced as the negative polaron stabilizing unit in the bicarbazole backbone structure of the hole transport type host. Two host materials were synthesized and the comparison of them proposed that the negative polaron stabilizing unit is a key to the lifetime of the phosphorescent organic light-emitting diodes. The dibenzofuran and benzonitrile embedded bicarbazole hosts performed better than the mCBP host. The dibenzofuran and benzonitrile modified bicarbazole hosts demonstrated high external quantum efficiency of 18.6 and 19.1%, respectively and lifetime extension by 30% compared with the conventional host without the negative polaron stabilizing unit.
中文翻译:
蓝色有机发光二极管中稳定运行的空穴传输型主机的设计
研究了用于混合基质的空穴传输型基质的分子设计,以提高磷光有机发光二极管的寿命。采用负极化子稳定化空穴传输型主体设计,并研究了负极化子稳定化单元的作用。在空穴传输型主体的联咔唑主链结构中,引入了二苯并呋喃或苄腈作为负极化子稳定单元。合成了两种主体材料,并进行了比较,认为负极化子稳定单元是磷光有机发光二极管寿命的关键。嵌入二苯并呋喃和苄腈的联苯并咪唑主机的性能优于mCBP主机。