Elucidating a complete picture of exciton dynamics in operating quantum-dot light-emitting diodes

阐明量子点发光二极管运行中激子动力学的完整图景

• 批准号: EP/Y02771X/1
• 负责人: Yunzhou Deng
• 金额: $ 23.84万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY02771X%2F1
• 关键词: Elucidating; complete; picture; exciton; dynamics; Elucidating; complete; picture; exciton; dynamics

Quantum-dot light-emitting diodes (QLEDs) are promising as energy-saving, color-pure, and flexible light sources for display, lighting, and communication techniques. At present, the performance of QLEDs is hindered by the efficiency roll-off at high currents and the device degradation in long-term operations. Further development of QLEDs demands an in-depth understanding of the fundamental processes in device operations. However, due to the lack of in-situ/operando characterization methods, the ultrafast charge and exciton dynamics in operating QLEDs is still not clear. Here, the project aims to go beyond the state-of-the-art methodologies, and create a set of ultrafast spectroscopic toolkits to elucidate a spatio-temporal resolved picture of exciton dynamics in operating QLEDs. I will realize a) operando time-resolved transient absorption (TA), b) operando spatio-temporal TA microscopy, and c) electrically-pumped time-resolved TA measurements on full stacks of QLEDs. I will gain quantitative insights into exciton dissociation, exciton diffusion, and electron injection dynamics. Finally, new mechanistic interpretations on the efficiency roll-off and degradation of QLEDs will be provided. The project covers the disciplines of optics, material science, and device physics, combining the host group's expertise in ultrafast spectroscopy, and theresearcher's expertise in QLEDs. The fellow will acquire complementary skills and knowledge to reach professional maturity. The outcomes will increase the fundamental understanding of nanomaterials and LEDs, facilitating the optimization of QLEDs towards practical requirements. The project will yield a widely-applicable toolkit for various LEDs. Successful implementation of this project will promote the competitiveness of the host organization in the field of optoelectronics. In the long run, the potential commercialization of QLEDs is expected to reduce electricity consumption and promote sustainable development in Europe.

量子点发光二极管（QLEDS）有望作为节能，颜色和灵活的光源，用于显示，照明和通信技术。目前，QLEDS的性能受到高电流下的效率滚动以及长期操作中设备降解的阻碍。 QLEDS的进一步发展需要深入了解设备操作中的基本过程。但是，由于缺乏原位/操作的表征方法，操作QLEDS中的超快电荷和激子动力学仍然尚不清楚。在这里，该项目旨在超越最先进的方法，并创建一组超快的光谱工具包，以阐明操作QLEDS中激子动态的时空解决图片。我将意识到a）操作时间分辨的瞬时吸收（TA），b）操作时空时空的TA显微镜以及c）在完整的QLEDS上进行电泵浦的时间分辨的TA测量。我将获得对激子解离，激子扩散和电子注入动力学的定量见解。最后，将提供有关QLEDS效率下降和降解的新机械解释。该项目涵盖了光学，材料科学和设备物理学的学科，结合了宿主组在超快光谱方面的专业知识，以及QLEDS的专业知识。该研究员将获得互补的技能和知识，以达到职业成熟。结果将增加对纳米材料和LED的基本理解，从而促进QLEDS针对实际要求的优化。该项目将为各种LED产生广泛的工具包。该项目的成功实施将促进主机在光电学领域的竞争力。从长远来看，QLEDS的潜在商业化有望减少电力消耗并促进欧洲的可持续发展。