Chemical design for high performance blue organic light-emitting diodes

高性能蓝色有机发光二极管的化学设计

• 批准号: 2749146
• 金额: --
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2749146
• 关键词: Chemical; design; performance; blue; organic

The lack of a high performance blue Light Emitting Diode (LED) has been a bottleneck in the scientific community since the advent of artificial lighting technologies. However, in 2014 the Nobel Prize in Physics was awarded to Akasaki, Amano, and Nakamura for their contribution to the development of the long-awaited highly efficient blue LED based on Gallium Nitride (GaN). However, despite the many successes of inorganic semiconductor technology in the electronics industry, these devices can be costly and difficult to fabricate. Instead, the field of plastic electronics utilises organic semiconductor materials which are more cost-effective, processable from solutions at low temperatures, and effectively infinitely tuneable through the alteration of their unique molecular structures. Despite the relative ease in the development of the red and green Organic LED (OLED), the blue OLED still suffers from short lifetimes and a lack of colour purity, which ultimately hinders the commercialisation of novel device architectures and competitiveness with alternative technologies. Since 2015, a new class of molecular materials known as Multi-Resonant Thermally Activated Delayed Fluorescence (MR-TADF) emitters have been of significant interest because they can afford deep-blue devices with high efficiencies and colour purity. However, they are also currently limited by their short lifetimes. Herein, we propose to provide greater insight into the photophysics underlying the degradation of MR-TADFs through combining a molecular encapsulation synthetic strategy and optical spectroscopy studies. It is hoped that a greater understanding of the photophysics will better place us to rationally design higher performing novel materials and reduce the use of 'trial-and-error' approaches seen within the field.

自从人工照明技术问世以来，缺乏高性能的蓝色发光二极管(LED)一直是科学界的一个瓶颈。然而，2014年诺贝尔物理学奖被授予赤崎、天野和中村，以表彰他们对基于氮化镓(GaN)的期待已久的高效蓝色LED的开发做出的贡献。然而，尽管无机半导体技术在电子行业取得了许多成功，但这些器件可能成本高昂，制造起来也很困难。取而代之的是，塑料电子领域利用有机半导体材料，这种材料更具成本效益，可以在低温下从溶液中加工，并且通过改变其独特的分子结构有效地无限调节。尽管红色和绿色有机LED(OLED)的开发相对容易，但蓝色OLED仍然存在寿命短和缺乏颜色纯度的问题，这最终阻碍了新型器件架构的商业化和与替代技术的竞争力。自2015年以来，一种被称为多共振热激活延迟荧光(MR-TADF)发射体的新型分子材料引起了人们的极大兴趣，因为它们可以负担得起高效率和颜色纯度的深蓝色器件。然而，它们目前也受到寿命短的限制。在这里，我们建议通过结合分子封装合成策略和光谱学研究来更深入地了解MR-TADF降解的光物理基础。人们希望，对光物理学的更好理解将使我们更好地合理地设计性能更高的新型材料，并减少在该领域中所看到的“反复试验”方法的使用。