Chiral oligothiophenes with remarkable circularly polarized luminescence and electroluminescence in thin films.,Chemistry - A European Journal

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Chiral oligothiophenes with remarkable circularly polarized luminescence and electroluminescence in thin films.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-09-23 , DOI: 10.1002/chem.202003547
Gianluigi Albano _{1,

2} , Laura Antonella Aronica ₁ , Alessandro Minotto ₃ , Franco Cacialli ₃ , Lorenzo Di Bari ₁

Affiliation

This work reports the first observation of circularly polarized electroluminescence (CPEL) in thin films of self‐organized oligothiophenes. Four new 1,4‐phenylene and 9H‐carbazole‐based oligothiophenes were ad hoc designed to ensure efficient spontaneous formation of chiral supramolecular order. They were easily synthesized and their chiroptical properties in thin films were measured. Circularly polarized luminescence (CPL) spectra revealed g_lum in the order of 10⁻² on a wide wavelengths range, originating from their self‐organized chiral supramolecular organization. These molecules have reasonable properties as organic semiconductors and for this reason they can constitute the active layer of circularly‐polarized organic light‐emitting diodes (CP‐OLEDs). Thus, we could investigate directly their electroluminescence (EL) and CPEL, without resorting to blends, but rather in a simple multilayer device with basic architecture. This is the first example of a CP‐OLED with active layer made only of a small organic compound.

中文翻译：

在薄膜中具有显着的圆偏振发光和电致发光的手性寡聚噻吩。

这项工作报告了在自组织的低聚噻吩薄膜中首次观察到圆偏振电致发光（CPEL）。为确保有效自发形成手性超分子序，特意设计了四个基于1,4-亚苯基和9 H-咔唑的新型低聚噻吩。它们易于合成，并测量了它们在薄膜中的手性。圆偏振发光（CPL）光谱显示的g _lum约为10 ^-2在很宽的波长范围内，源自它们的自组织手性超分子组织。这些分子具有作为有机半导体的合理特性，因此，它们可以构成圆极化有机发光二极管（CP-OLED）的活性层。因此，我们可以直接研究它们的电致发光（EL）和CPEL，而无需求助于掺混物，而是在具有基本结构的简单多层设备中进行研究。这是具有仅由小有机化合物制成的活性层的CP-OLED的第一个示例。

更新日期：2020-09-23

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