高效蓝光荧光有机发光二极管的老化机理及寿命提升方法研究

有机发光二极管（OLED）是下一代平板显示技术，并在可穿戴设备、健康照明等领域拥有独特优势。高效稳定的OLED是实现产业化的重要前提。目前，基于热激活原理的蓝光荧光OLED实现了100%内量子效率，但器件的稳定性不高、老化机理不明确，是亟需解决的一个科学问题。为此，本项目拟设计多通道载流子和激子调控的高效发光层，通过对载流子复合及激子淬灭的研究，揭示器件老化机理，探讨提高寿命的方法，主要包括：（1）对发光层中载流子复合动力学展开研究，揭示复合过程中能量损耗机制，探索低电压蓝光OLED的设计方法；（2）研究激子淬灭与材料稳定性的内在联系，构建老化过程中缺陷态的增长模型，提出抑制缺陷态的方法；（3）采用光学微腔设计-载流子复合仿真相结合的方法，优化低电压、低激子淬灭速率的设计策略，有效提升高效蓝光荧光OLED的稳定性。研究成果将为我国OLED显示及照明等产业的发展提供理论和技术支持。

Organic light-emitting diodes (OLEDs) are the next generation of flat panel display technology, and also have unique advantages in wearable devices, health lighting, etc. Efficient and stable blue OLEDs are prerequisites for OLED industrialization. At present, the blue fluorescent OLEDs based on the thermal activation principle achieve 100% internal quantum efficiency. However, they are unstable and the degradation mechanism remains unclear, which is a scientific problem that needs to be addressed urgently. For this reason, this project intends to design efficient light-emitting layers with multiple channels for carrier controlling and exciton regulation. We investigate the charge recombination and exciton annihilation processes to disclose the degradation mechanism and explore the lifetime improvement strategies, mainly focus on (1) studying the carrier recombination dynamics in the light-emitting layers, establishing the energy loss mechanism in the recombination processes, and exploring the methods to reduce driving voltages; (2) investigating the relationship between exciton annihilation and material stability, building the growth model of defect states during the degradation processes, and proposing the methods to suppress the defect states; (3) using optical microcavity and carrier recombination simulation to optimize the blue OLEDs with low driving voltages and low exciton annihilation rates. The research results will provide theoretical and technical support for the industrialization development of OLED display and lighting in China.