TADF Emitters for OLEDs

用于 OLED 的 TADF 发射器

• 批准号: EP/P010482/1
• 负责人: Eli Zysman-Colman
• 金额: $ 93.79万
• 依托单位: University of St Andrews
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FP010482%2F1
• 关键词: TADF; Emitters; OLEDs

Lighting accounts for almost 20% of world electricity demand. Widescale adoption of energy efficient lighting would have a profound positive effect on energy consumption and the environment. In addition, in the developing world improved lighting would increase economic output. Organic semiconductors are attractive materials for lighting applications because of the scope to tune their properties (such as colour of light emission) and deposit them by simple processes from solution. This means they have the potential for large area light source to be made inexpensively, and the possibility of such light sources being flexible or conformable. The light emission process involves injecting opposite charges which combine to form excited states called singlets and triplets. In most materials triplets do not emit light, but for high efficiency the triplets need to be harvested to contribute to light emission. The present state-of-the-art lighting devices (organic light-emitting diodes, OLEDs) employ the use of iridium and other metal complex phosphors. The rarity of these metals and their associated cost precludes their use in inexpensive lighting devices. In this project we propose to explore thermally activated delayed fluorescence (TADF) emitters which offer a tantalizing solution as these materials are based on small molecule organic compounds i.e. are made from very abundant materials. TADF emitters rely on a molecular design where the singlet and triplet energy levels are close enough together that conversion of triplets to light-emitting singlets is efficient, thereby leading to highly efficient light-emitting devices. The inexpensive starting materials and relatively low-cost synthesis coupled with comparable optoelectronic properties to the exepnsive metal complexes makes this next-generation of emitters very promising.In our proposal we address grand challenges in the development of TADF emitters: (1) the development of a bright and stable deep blue emitter; (2) the improvement of high efficiency red emitters based on organic compounds; (3) the fabrication of low cost EL devices. For (1) and (2) we will design and evaluate materials that address these challenges, guided by detailed photophysical and optoelectronic measurements to relate the properties of the materials to their structure. Most work on TADF materials to date has focused on evaporated materials. Instead we will develop materials that can be processed from solution to address challenge (3) of simple fabrication to enable the full benefit of these low cost but efficient emitters to be realised.

照明几乎占全球电力需求的20%。广泛采用节能照明将对能源消耗和环境产生深远的积极影响。此外，在发展中国家，改进照明将增加经济产出。有机半导体是一种极具吸引力的照明材料，因为它可以调节它们的性质(如发光颜色)，并通过简单的溶液过程来沉积它们。这意味着它们有可能以低廉的价格制造大面积光源，并且这种光源有可能是灵活的或符合要求的。发光过程包括注入相反的电荷，这些电荷结合在一起形成被称为单态和三态的激发态。在大多数材料中，三胞胎不发光，但为了提高效率，需要采集三胞胎以促进光发射。目前最先进的照明设备(有机发光二极管，OLED)使用了Ir和其他金属络合物荧光粉。这些金属的稀有性及其相关成本使其无法用于廉价的照明设备。在这个项目中，我们打算探索热激活延迟荧光(TADF)发射体，它提供了一个诱人的解决方案，因为这些材料是基于小分子有机化合物，即由非常丰富的材料制成的。TADF发射器依赖于一种分子设计，其中单态和三态能级足够接近，因此三态到发光单态的转换是高效的，从而产生高效的发光设备。廉价的起始材料和相对低成本的合成，再加上与电致发光金属络合物类似的光电性能，使得这种新一代发射器非常有希望。在我们的提案中，我们解决了TADF发射器开发中的重大挑战：(1)开发明亮稳定的深蓝色发射器；(2)基于有机化合物的高效红色发射器的改进；(3)低成本EL器件的制造。对于(1)和(2)，我们将设计和评估应对这些挑战的材料，以详细的光物理和光电测量为指导，将材料的性质与其结构联系起来。到目前为止，大多数关于TADF材料的工作都集中在蒸发材料上。相反，我们将开发可从溶液中加工的材料，以应对简单制造的挑战(3)，以实现这些低成本但高效的发射器的全部好处。

项目成果

Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films.

介晶基团控制多共振 TADF 发射体薄膜中的发射体方向。

• DOI: 10.1002/anie.202218911
• 发表时间: 2023
• 期刊: Angewandte Chemie (International ed. in English)
• 作者: Chen D

Bipyridine-Containing Host Materials for High Performance Yellow Thermally Activated Delayed Fluorescence-Based Organic Light Emitting Diodes with Very Low Efficiency Roll-Off

• DOI: 10.1002/adom.201901283
• 发表时间: 2019-11-21
• 期刊: ADVANCED OPTICAL MATERIALS
• 影响因子: 9
• 作者: Chen, Dongyang;Rajamalli, Pachaiyappan;Zysman-Colman, Eli
• 通讯作者: Zysman-Colman, Eli

Mesogenic Groups Control the Emitter Orientation in Multi-Resonance TADF Emitter Films**

介晶基团控制多共振 TADF 发射体薄膜中的发射体方向**

• DOI: 10.1002/ange.202218911
• 发表时间: 2023
• 期刊: Angewandte Chemie
• 作者: Chen D

Tuning the Emission and Exciton Utilization Mechanisms of Pyrazine-Based Multi-Carbazole Emitters and their use in Organic Light-Emitting Diodes

调整吡嗪基多咔唑发射体的发射和激子利用机制及其在有机发光二极管中的应用

• DOI: 10.26434/chemrxiv-2023-kq61s
• 发表时间: 2023
• 作者: Chen D

Controlling the Emitter Orientation in Solution-processed Films through Introduction of Mesogenic Groups within a Multi-resonance Thermally Activated Delayed Fluorescence Emitter

• DOI: 10.26434/chemrxiv-2022-dc4zm
• 发表时间: 2022-02
• 作者: Dongyang Chen;F. Tenopala‐Carmona;Julius A Knöller;A. Mischok;David Hall;S. Suresh;Tomas Matulaitis;Y. Olivier;Pierre Nacke;F. Giesselmann;S. Laschat;M. Gather;E. Zysman‐Colman