Effects of sub-wavelength photonic nanostructures on thermally-activated delayed fluorescence

亚波长光子纳米结构对热激活延迟荧光的影响

• 批准号: EP/Y021495/1
• 负责人: Jean Charles Ribierre
• 金额: $ 104.52万
• 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: 2024
• 资助国家: 英国
• 起止时间: 2024 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FY021495%2F1
• 关键词: Effects; sub; wavelength; photonic; nanostructures

Organic light-emitting diodes (OLEDs) have become a dominant technology in the display industry and hold great promise for a variety of applications in the fields of lighting, visible communication, sensing and healthcare. Current research efforts focus on the development of thermally-activated delayed fluorescent (TADF) emitters that promise highly efficient and long-lifetime performance without the use of any heavy metals. These materials show a small energy gap between their singlet and triplet energy levels allowing the up-conversion of non-emissive triplets to light-emitting singlets at room temperature via the reverse intersystem crossing process. Although efficient triplet harvesting can take place in TADF OLEDs, the dynamics involved in the TADF mechanism need to be faster to substantially reduce the accumulation of long-lived triplet excitons during the device operation and improve their overall performance. This project addresses this research challenge by proposing an innovative approach based on the integration of sub-wavelength photonic nanostructures into TADF OLEDs. Via their effects on the local photonic density and the dielectric permittivity of the effective media, the photonic nanostructures will be engineered to accelerate both radiative decay and reverse intersystem crossing rates. This will improve the efficiency of OLEDs, especially at high brightness and increase their lifetime. The successful outcome of the project is expected to lead to an improvement of the TADF OLED technology and will be highly relevant for a range of other applications in fields as diverse as organic optoelectronics, sensing and photochemistry.

有机发光二极管（OLEDS）已成为展示行业的主要技术，并对照明，可见沟通，感应和医疗保健领域的各种应用保持着巨大的希望。当前的研究工作集中于热激活的延迟荧光（TADF）发射器的发展，这些发射器有望在不使用任何重金属的情况下高效且长期的性能。这些材料在单线和三胞胎能量水平之间显示了较小的能量差距，从而通过反向间间交叉过程在室温下向室温下发射发光的单元进行了上调。尽管可以在TADF OLED中进行有效的三胞胎收获，但TADF机制中涉及的动态需要更快，以大大减少设备操作过程中长期寿命的三胞胎激子的积累并改善其整体性能。该项目通过提出基于子波光子纳米结构与TADF OLED的整合而提出创新方法来应对这项研究挑战。通过对有效培养基的局部光子密度和介电介电常数的影响，将设计光子纳米结构，以加速辐射衰变和反向间间交叉速率。这将提高OLED的效率，尤其是在高亮度并增加其寿命。预计该项目的成功结果将导致TADF OLED技术的改进，并将与像有机光电，传感和光化学等多样化的田野中的一系列应用相关。