Fluorotonix: Fluorescence standards to characterise the photoluminescence quantum yield of molecules for photovoltaic and display applications

Fluorotonix：用于表征光伏和显示应用分子光致发光量子产率的荧光标准品

• 批准号: 2595830
• 金额: --
• 依托单位: Northumbria University
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2595830
• 关键词: Fluorotonix; Fluorescence; standards; characterise; photoluminescence

Renewable energies technology is to play a massive part in the future of energy generation especially with the global concern of climate change. Increasing the efficiency of organic light-emitting diodes (OLEDs) is one focus in striving for a greener future. More than 20% of the world's energy consumption is due to lighting and displays and developing more efficient materials for OLED applications will help reduce this usage and save energy. A key goal in the development of OLEDs is to produce stable systems that have 100% internal quantum efficiency (IQE) i.e. every charge injected into the device creates a photon. The original OLEDs were limited to 25% IQE due to the quantum mechanical nature of the charges but recent developments allow us to push beyond this limit. Thermally activated delayed fluorescence (TADF) is one of those developments and will be a main focus on our journey to achieve 100% IQE. The principal focus of my project is optimising organic compounds in the blue region. This is particularly critical as high energy blue emission is a difficult region to obtain stable TADF compounds. Commercial blue OLEDs are often based on emitters that undergo triplet-triplet annihilation; a different phenomenon that is limited to maximum 62.5% IQE. Finding a stable, blue TADF emitter of 100% IQE will have significant efficiency gains on the current state-of-the-art. Approach:N-alkylation of donor - acceptor organic compounds: Working with collaborators at the University of Glasgow I will characterize groups of quinoline and pyridine salts with carbazole moieties and differing counter ions in terms of their photoluminescent properties. The Etherington group has begun to study the effect of N-alkylation and quaternisation with these compounds and my project will aim to develop and probe the excited state processes that occur from this. I will analyse how N-alkylation tunes the compounds such that TADF can be activated. The study therefore provides a systematic way to achieve the stable blue light-emitting materials desired by commercial companies. N-alkylation of natural products: Working with Dr Jonathan Knowles in Applied Sciences at Northumbria University I will probe how N-alkylation of organic compounds, for natural product like compounds such as quinine. This will allow us to understand how the synthetic procedure affects the more fundamental processes such as charge transfer and conjugation that lead to the macroscopic phenomena such as TADF. Methods:These compounds will be measured both in solution and solid form, across a series of host environments and the preparation method of film samples will also be investigated by comparing the drop cast and spin coating methods. I will obtain their photoluminescence quantum yield (PLQY), which defines a measure of the efficiency of photon emission as a ratio of photons emitted and photons absorbed and is a crucial property of these compounds if they are to be of commercial use. A detailed understanding of PLQY, steady-state and time-resolved photoluminescence is key for these systems and will provide both fundamental knowledge and also the criteria that are of interest to commercial OLED companies. More efficient displays mean reduced energy consumption The world is now heavily reliant on portable electronics and mobile phones. Increasing the efficiency of their displays is a crucial way to reduce energy consumption in these devices. Understanding the physical processes that can improve their efficiency puts this work at the core of EPSRC's remit. This project will allow me to use my chemical background and explore the physical properties of materials for OLEDs, making this a truly interdisciplinary project across the physical sciences. It will combine a fundamental and applied approach to organic light-emitting materials and will give me the opportunity to train on and compile data from a wide range of equipment at the universities of Northumbria and Durham.

可再生能源技术将在未来的能源生产中发挥巨大作用，特别是在全球关注气候变化的情况下。提高有机发光二极管(OLED)的效率是努力实现更绿色未来的一个重点。全球超过20%的能源消耗来自照明和显示器，为OLED应用开发更高效的材料将有助于减少这种使用并节省能源。开发OLED的一个关键目标是生产具有100%内部量子效率(IQE)的稳定系统，即注入到器件中的每一个电荷都会产生一个光子。由于电荷的量子力学性质，最初的OLED被限制在25%的IQE，但最近的发展允许我们超越这一限制。热激活延迟荧光(TADF)就是这些进展之一，并将是我们实现100%IQE的主要关注点。我的项目的主要重点是优化蓝色区域的有机化合物。这一点尤其关键，因为高能蓝色发射很难获得稳定的TADF化合物。商用蓝色OLED通常基于经历三重-三重湮灭的发射体；这是一种不同的现象，IQE最高限制为62.5%。找到一个稳定的、100%IQE的蓝色TADF发射器将在当前最先进的水平上显著提高效率。方法：供体-受体有机化合物的N-烷基化：与格拉斯哥大学的合作者合作，我将根据它们的光致发光性质表征带有咔唑基团和不同反离子的喹啉和吡啶盐基团。Etherington小组已经开始研究这些化合物的N-烷基化和季胺化的影响，我的项目将致力于开发和探索由此产生的激发态过程。我将分析N-烷基化如何调节化合物，从而激活TADF。因此，该研究为获得商业公司所需的稳定的蓝色发光材料提供了一种系统的方法。天然产物的N-烷基化：我将与诺森比亚大学应用科学的乔纳森·诺尔斯博士合作，探索有机化合物的N-烷基化反应，例如奎宁等天然产物的N-烷基化反应。这将使我们了解合成过程如何影响更基本的过程，如导致TADF等宏观现象的电荷转移和共轭过程。方法：这些化合物将在一系列宿主环境中以溶液和固体的形式进行测量，并通过比较滴注和旋涂的方法来研究薄膜样品的制备方法。我将获得它们的光致发光量子产率(PLQY)，它定义了一种衡量光子发射效率的指标，即发射的光子和吸收的光子的比率，如果它们要用于商业用途，这是这些化合物的关键性质。对PLQY、稳态和时间分辨光致发光的详细了解是这些系统的关键，将提供基本知识和商业OLED公司感兴趣的标准。更高效的显示器意味着更低的能源消耗世界现在严重依赖便携式电子产品和手机。提高显示器的效率是降低这些设备能耗的关键方法。了解能够提高效率的物理过程将这项工作放在EPSRC的核心任务中。这个项目将使我能够利用我的化学背景，探索有机发光二极管材料的物理性质，使其成为一个真正的跨物理科学的跨学科项目。它将结合有机发光材料的基本和应用方法，并将使我有机会培训和汇编诺森比亚大学和达勒姆大学的各种设备的数据。