Exploiting asymmetric anthracene-based multifunctional materials based on a “bulky peripheral modification” strategy for constructing simplified efficient deep-blue fluorescent OLEDs,Journal of Materials Chemistry C

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Exploiting asymmetric anthracene-based multifunctional materials based on a “bulky peripheral modification” strategy for constructing simplified efficient deep-blue fluorescent OLEDs
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2021-08-18 , DOI: 10.1039/d1tc02081a
Runda Guo ₁ , Shaofeng Ye ₁ , Yaxiong Wang ₁ , Yalei Duan ₁ , Kaiyuan Di ₁ , Lei Wang ₁

Affiliation

An asymmetric bulky periphery enveloping strategy is proposed to delicately manipulate molecules for the construction of novel multifunctional organic electronic materials. Here, 9,10-diphenylanthracene (DPA) was selected as the framework with both carrier-transporting channel and blue emission, with bulky 1,5-diazarcarbazole (15NCz) and terphenyl/terpyridine grafted on it. Two asymmetric anthracene-containing derivatives, namely 5-(4-(10-(5′-phenyl-[1,1′:3′,1′′-terphenyl]-4-yl)anthracen-9-yl)phenyl)-9H-1,5-diazarcarbazole (p-15NCz3PhDPA) and 9-(4-(10-(4-([3,2′:6′,3′′-terpyridin]-4′-yl)phenyl)anthracen-9-yl)phenyl)-9H-1,5-diazarcarbazole (p-15NCz3PyDPA), were first designed and synthesized. The bulky periphery groups 15NCz and terphenyl/terpyridine with large steric hindrance could efficiently increase the molecular space volume and diminish the intermolecular π–π stacking, which helped to promote the photoluminescence quantum yield (PLQY). Meanwhile, the introduced terphenyl/terpyridine manipulated the charge-carrier-injecting and bipolar-transporting characteristics. A detailed device engineering study was carried out, where it was found that p-15NCz3PhDPA- and p-15NCz3PyDPA-based unilateral homogenous devices could achieve deep-blue emissions with Commission Internationale de L’Eclairage (CIE) coordinates of (0.149, 0.081) and (0.151, 0.106) at a voltage of 6 V, and a narrow full width at half maximum (FWHM) of ∼52 nm and an impressive maximum external quantum efficiency (EQE_max) of 5.87% and 5.80%, respectively. These new multifunctional materials performed better than the commonly used electron-transporting material TPBi. Accordingly, this work sheds light on designing multifunctional organic electronic materials, particularly offering a sensible way to construct efficient low-power-consumption simplified deep-blue fluorescent OLEDs.

中文翻译：

利用基于“大体积外围修饰”策略的不对称蒽基多功能材料构建简化的高效深蓝色荧光 OLED

提出了一种不对称的庞大外围包络策略，以巧妙地操纵分子以构建新型多功能有机电子材料。在这里，选择 9,10-二苯基蒽 (DPA) 作为具有载流子传输通道和蓝光发射的框架，并在其上接枝了庞大的 1,5-二氮杂咔唑 (15NCz) 和三联苯/三联吡啶。两种不对称含蒽衍生物，即5-(4-(10-(5'-苯基-[1,1':3',1''-三联苯基]-4-基)蒽-9-基)苯基) -9 H -1,5-二氮杂咔唑 ( p -15NCz3PhDPA ) 和 9-(4-(10-(4-([3,2':6',3''-三联吡啶]-4'-yl)苯基) anthracen-9-yl)phenyl)-9 H -1,5-diazarcarbazole ( p -15NCz3PyDPA)，首先被设计和合成。体积大的外围基团15NCz和具有大空间位阻的三联苯/三联吡啶可以有效地增加分子空间体积并减少分子间π-π堆积，这有助于提高光致发光量子产率（PLQY）。同时，引入的三联苯/三联吡啶控制了载流子注入和双极传输特性。进行了详细的设备工程研究，发现p -15NCz3PhDPA-和p -15NCz3PyDPA的单边同质器件可以在 6 V 电压下实现深蓝色发射，国际照明委员会 (CIE) 坐标为 (0.149, 0.081) 和 (0.151, 0.106)，半高全宽较窄（ FWHM) 约为 52 nm，最大外部量子效率 (EQE _max ) 分别为 5.87% 和 5.80%。这些新型多功能材料的性能优于常用的电子传输材料 TPBi。因此，这项工作为设计多功能有机电子材料提供了思路，特别是为构建高效的低功耗简化深蓝色荧光 OLED 提供了一种明智的方法。

更新日期：2021-09-06

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