Rational Ion Migration Management for Long-Term Stable Blue Perovskite Light-Emitting Diodes

长期稳定蓝色钙钛矿发光二极管的合理离子迁移管理

• 批准号: EP/Y029135/1
• 负责人: Zhongcheng Yuan
• 金额: $ 25.55万
• 依托单位: University of Oxford
• 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%2FY029135%2F1
• 关键词: Rational; Ion; Migration; Management; Long

Metal halide perovskites, which possess high conductivity, high photoluminescence quantum efficiency and color purity, are ideal emitters for cost-effective light-emitting diodes (LEDs). Although EQEs of perovskite LEDs (PeLEDs) emitting in red and green have been boosted to over 25 % recently, approaching that of prevailing OLED and QLEDs, it is still a great challenge to achieve high efficiency blue PeLEDs. More importantly, overcoming poor operational lifetime of PeLEDs (around 10 hours for blue PeLEDs), which is thought to originate from severe ion migration induced by electric field in perovskite emitters and interfacial degradation, is a key for further development of PeLEDs and future applications in displays and lighting. The objective of RAIMM is achieving pure blue PeLEDs (emitting from 465 to 475 nm) with EQEs exceeding 20 % and significantly improved lifetime over 1,000 hours @100 cd/m2. My strategies are using several powerful characterizations (e.g., in-situ PL, in-situ EL imaging, PL&EL, etc.) to reveal a clear degradation mechanism of perovskite emitters and PeLEDs. Accordingly, I will introduce different processing additives to achieve highly emissive perovskite emitters with much suppressed ion migration. With the stable perovskite emitters, new device structures will be designed to stabilize the interfacial contacts and decrease turn-on voltages of PeLEDs. This strategy will minimize the electrical fields across the PeLEDs and limit ion penetration through charge transporting layers. Finally, I will be able to achieve high efficiency pure blue PeLEDs with lifetime over 1,000 h, representing a milestone in PeLEDs community. I will collaborate with Helio Display Materials to demonstrate the first all perovskite-based prototype display with Rec. 2020 color gamut. I believe our results will dramatically accelerate the progress of PeLEDs and stimulate further breakthroughs in other perovskite optoelectronic devices.

金属卤化物钙钛矿具有高电导率、高光致发光量子效率和色纯度，是经济高效的发光二极管（LED）的理想发射器。尽管红光和绿光钙钛矿LED（PeLED）的EQE最近已提高到25%以上，接近主流的OLED和QLED，但实现高效率蓝光PeLED仍然是一个巨大的挑战。更重要的是，克服PeLEDs较差的工作寿命（蓝色PeLEDs约为10小时）是PeLEDs进一步发展和未来应用的关键，这种寿命被认为是由钙钛矿发射器中的电场引起的严重离子迁移和界面退化引起的。显示器和照明。 RAIMM 的目标是实现纯蓝色 PeLED（发射波长为 465 至 475 nm），EQE 超过 20%，并在 100 cd/m2 下显着提高使用寿命超过 1,000 小时。我的策略是使用几种强大的表征（例如，原位 PL、原位 EL 成像、PL&EL 等）来揭示钙钛矿发射器和 PeLED 的清晰降解机制。因此，我将引入不同的加工添加剂，以实现离子迁移受到极大抑制的高发射钙钛矿发射体。有了稳定的钙钛矿发射器，我们将设计新的器件结构来稳定界面接触并降低 PeLED 的开启电压。该策略将最大限度地减少 PeLED 上的电场，并限制离子穿过电荷传输层。最终，我将能够实现寿命超过 1,000 小时的高效率纯蓝色 PeLED，这是 PeLED 社区的一个里程碑。我将与 Helio Display Materials 合作，展示第一个基于 Rec. 的全钙钛矿原型显示器。 2020年色域。我相信我们的研究结果将极大地加速 PeLED 的进步，并刺激其他钙钛矿光电器件的进一步突破。