Key Factor Managing the Horizontal Emitting Dipole Orientation of a Thermally Activated Delayed Fluorescence Emitter in a Mixed Host,ACS Applied Materials & Interfaces

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Key Factor Managing the Horizontal Emitting Dipole Orientation of a Thermally Activated Delayed Fluorescence Emitter in a Mixed Host
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-01 , DOI: 10.1021/acsami.2c20210
Ho Jin Jang ₁ , Jun Yeob Lee ₁

Affiliation

Horizontal emitting dipole orientation (EDO) of thermally activated delayed fluorescence (TADF) molecules in a mixed host was studied by altering the host materials and host composition of the mixed host to gain insight into the important parameter of the host governing the EDO of TADF emitters. Five different host materials were combined with 1,3-bis(carbazol-9-yl)benzene (mCP), demonstrating that the host–dopant interaction is crucial to the absolute value of the horizontal EDO of the TADF emitters, whereas the glass transition temperature (T_g) is the important parameter determining the EDO dependence upon host composition. The mixed host of mCP with a high T_g host maintained high horizontal EDO in the mCP poor host composition, while that of mCP with a low T_g host showed average horizontal EDO of two hosts. Therefore, the combination of a high T_g n-type host enabling a strong host–dopant interaction with the p-type host with the usage of the n-type-host-rich composition is effective to achieve high horizontal EDO in the mixed-host-based TADF emitting layer.

中文翻译：

管理混合主机中热激活延迟荧光发射器水平发射偶极子取向的关键因素

通过改变混合主体的主体材料和主体组成，研究了混合主体中热激活延迟荧光 (TADF) 分子的水平发射偶极子取向 (EDO)，以深入了解主体控制 TADF 发射体 EDO 的重要参数. 五种不同的主体材料与 1,3-双(咔唑-9-基)苯 (mCP) 结合，表明主体-掺杂相互作用对于 TADF 发射体的水平 EDO 的绝对值至关重要，而玻璃化转变温度 ( T _g ) 是决定 EDO 对宿主成分的依赖性的重要参数。高T _g mCP的混合宿主宿主在 mCP 不良宿主组成中保持高水平 EDO，而具有低 Tg 宿主的 mCP显示_两个宿主的平均水平 EDO。因此，将高Tg _n型主体与 p 型主体进行强主体-掺杂相互作用，并使用富含 n 型主体的成分，可有效地在混合-中实现高水平 EDO。基于宿主的 TADF 发光层。

更新日期：2022-12-01

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