Structurally Regulated Carbazole–Pyridine Derivatives Based on Space-Crowded Theory for Efficient Narrowband Ultraviolet Nondoped Organic Light-Emitting Diodes from the High-Lying Reverse Intersystem Crossing Process,ACS Applied Materials & Interfaces

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Structurally Regulated Carbazole–Pyridine Derivatives Based on Space-Crowded Theory for Efficient Narrowband Ultraviolet Nondoped Organic Light-Emitting Diodes from the High-Lying Reverse Intersystem Crossing Process
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-12-14 , DOI: 10.1021/acsami.2c20806
Yumiao Huo _{1,

2} , Jichen Lv ₁ , Yanchao Xie ₁ , Lei Hua ₃ , Yuchao Liu ₁ , Zhongjie Ren ₃ , Tingxi Li ₂ , Shian Ying ₁ , Shouke Yan _{1,

3}

Affiliation

Achieving ultraviolet and narrowband emission simultaneously in nondoped organic light-emitting diodes (OLEDs) remains a tremendous challenge. Here, a “space-crowded donor–acceptor–donor” molecular design strategy is proposed for developing ultraviolet pure organic fluorophores by the nearby substituted positions at the phenyl linker between carbazole and pyridine units. Benefitting from the large steric hindrance effect, multiple intramolecular interactions, and low-frequency vibronic coupling dominated excited state property, all the emitters exhibit excellent fluorescence efficiencies at the solid state as well as the narrow full width at half maximums (FWHMs). Moreover, the effect of different substitution positions of pyridine on the structure–property relationship is also revealed. Consequently, the nondoped OLEDs exhibit an electroluminescence emission peak of 397 nm with FWHMs of 17 and 22 nm. Due to the high-lying reverse intersystem crossing process, external quantum and exciton utilization efficiencies of 3.6 and 54.55%, respectively, have been achieved based on the emitter with para-linkage. These findings may pave an avenue for the development of high-performance narrowband ultraviolet materials and OLEDs.

中文翻译：

基于空间拥挤理论的结构调控咔唑-吡啶衍生物用于高位反向系间穿越过程中的高效窄带紫外非掺杂有机发光二极管

在非掺杂有机发光二极管 (OLED) 中同时实现紫外和窄带发射仍然是一个巨大的挑战。在这里，提出了一种“空间拥挤的供体-受体-供体”分子设计策略，用于通过咔唑和吡啶单元之间的苯基连接基附近的取代位置开发紫外纯有机荧光团。得益于大的空间位阻效应、多重分子内相互作用和低频电子振动耦合主导的激发态特性，所有发射体在固态下都表现出优异的荧光效率以及窄的半峰全宽 (FWHM)。此外，还揭示了吡啶不同取代位置对结构-性质关系的影响。最后，未掺杂的 OLED 显示出 397 nm 的电致发光发射峰，FWHM 为 17 和 22 nm。由于高位反向系统间穿越过程，外量子和激子利用效率分别为 3.6 和 54.55%，基于发射器对联。这些发现可能为开发高性能窄带紫外材料和 OLED 铺平道路。

更新日期：2022-12-14

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