Secondary Exciplex by Electromer Mediated Charge Transfer for Multiband Electroluminescence,ACS Macro Letters

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Secondary Exciplex by Electromer Mediated Charge Transfer for Multiband Electroluminescence
ACS Macro Letters ( IF 5.1 ) Pub Date : 2021-09-30 , DOI: 10.1021/acsmacrolett.1c00501
Xinping Zhang ₁ , Qiaohui Yang ₁ , Yulan Fu ₁ , Yiwei Zhang ₁

Affiliation

Charge-transfer states have been observed extensively in heterojunctions of organic semiconductors, which are also referred to as exciplexes in polymer blends. Such mechanisms have been well understood in the conventional material systems. However, electromer states may be produced only in some polymeric molecules with folded chains. We report here the interaction between exciplex and electromer states, which facilitates the formation of a new electrically excited state that we define as a secondary exciplex. This is an indirect process understood as an electromer-mediated heterojunction. We discovered such an optoelectronic mechanism in the blend film of poly(9,9′-dioctylfluorene-co-bis-N,N′-(4-butylphenyl)-bis-N,N′-pheny-l,4-phenylene-diamine) (PFB) and poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT). Four emission bands can be resolved from the electroluminescence spectrum, including those based on the excitons, the electromers, and the primary and secondary exciplexes. The whole electroluminescence spectrum thus extends from the green (500 nm) to the near-infrared (900 nm) with a full bandwidth of 400 nm. These new discoveries with the conventional light-emitting polymers are important not only for polymeric optoelectronics, but also for the development of broadband light-emitting devices.

中文翻译：

用于多带电致发光的电子介导电荷转移的二次激态复合物

在有机半导体的异质结中广泛观察到电荷转移状态，在聚合物共混物中也被称为激发复合物。这种机制在传统的材料系统中已经得到了很好的理解。然而，电子态可能仅在一些具有折叠链的聚合物分子中产生。我们在这里报告了 exciplex 和electromer 状态之间的相互作用，这促进了我们定义为次级 exciplex 的新电激发态的形成。这是一个间接过程，被理解为电子介导的异质结。我们在聚(9,9'-二辛基芴-co-双-N , N '-(4-丁基苯基)-双-N , N的共混膜中发现了这种光电机制'-苯基-l,4-苯二胺) (PFB) 和聚[(9,9-二辛基芴基-2,7-二基) -alt- (苯并[2,1,3]噻二唑-4,8-二基)] (F8BT)。可以从电致发光光谱中分辨出四个发射带，包括基于激子、电子体以及初级和次级激子的发射带。因此，整个电致发光光谱从绿色（500 nm）延伸到近红外（900 nm），全带宽为 400 nm。传统发光聚合物的这些新发现不仅对聚合物光电子学很重要，而且对宽带发光器件的开发也很重要。

更新日期：2021-10-19

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