Molecular Origin of Balanced Bipolar Transport in Neat Layers of the Emitter CzDBA,Advanced Materials Technologies

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Molecular Origin of Balanced Bipolar Transport in Neat Layers of the Emitter CzDBA
Advanced Materials Technologies ( IF 6.4 ) Pub Date : 2020-07-06 , DOI: 10.1002/admt.202000120
Wenlan Liu ₁ , Naresh B. Kotadiya ₁ , Paul W. M. Blom ₁ , Gert‐Jan A. H. Wetzelaer ₁ , Denis Andrienko ₁

Affiliation

Recently, an efficient single‐layer organic light‐emitting diode has been reported, consisting of a neat layer of the diboron‐based thermally activated delayed fluorescence emitter 5,10‐bis(4‐(9H‐carbazol‐9‐yl)‐2,6‐dimethylphenyl)‐5,10‐dihydroboranthrene, exhibiting remarkably balanced bipolar electron and hole transport. Here, the donor–acceptor–donor architecture of the molecule is linked to the transport characteristics of its neat amorphous films. It is found that energetic disorder is larger for holes than for electrons, explaining the experimentally observed difference in temperature activation of the mobility. Although a difference in energetic disorder would suggest unbalanced charge transport, it is demonstrated that it is partly counteracted by larger coupling elements for holes.

中文翻译：

发射极CzDBA的整齐层中平衡双极性迁移的分子起源

最近，已经报道了一种有效的单层有机发光二极管，它由基于二硼的热活化延迟荧光发射体5,10-bis（4（（9 H-咔唑-9-基））的整齐层组成。2,6-二甲基苯基）-5,10-二氢硼烷，表现出非常平衡的双极电子和空穴传输。在这里，分子的供体-受体-供体结构与其纯净的非晶膜的传输特性有关。发现空穴的能级紊乱大于电子的能级紊乱，这解释了实验观察到的迁移率的温度激活差异。尽管高能障碍的差异可能表明电荷传输不平衡，但事实证明，较大的空穴耦合元件会部分抵消这种电荷传输。

更新日期：2020-07-06

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