论文标题
通过界面成核播种的有效蓝色钙钛矿发光二极管的协同电致工操作
Synergistical Electroluminescent Manipulation for Efficient Blue Perovskite Light-Emitting Diodes Through Interfacial Nucleation Seeding
论文作者
论文摘要
金属卤化物钙钛矿发光二极管（骨发射）的低效率具有蓝色发射的限制，它们的潜在应用在大区域全彩色显示器和固态照明中。对整个电致发光过程的微妙控制是必不可少的，以克服蓝色骨的效率限制。在这里，我们演示了一种有效的设备体系结构，可以协同减少电子光转换过程中的能量损失，并增强设备中捕获光的提取。提出了界面成核播种方案，以控制高度发射的钙钛矿纳米晶体的结晶过程，并抑制由于界面氢键相互作用而导致的陷阱介导的非辐射重组损失。这种操作导致记录的外部量子效率（EQE）的蓝色骨出现在486 nm处的蓝色毛刺，并提高了光谱稳定性和运行寿命。此外，在组合内部外耦合结构而无需光谱失真之后，最大均衡器达到16.8％，当在设备顶部使用基于镜头的结构时，可以将其进一步提高到27.5％。我们预计我们的工作为其在高性能腰带中的应用提供了一种有效的方法。
The low efficiency of metal halide perovskite light-emitting diodes (PeLEDs) with blue emission block their potential applications in large-area full-color displays and solid-state lighting. A delicate control over the entire electroluminescence process is indispensable to overcome the efficiency limitations of blue PeLEDs. Here, we demonstrate an efficient device architecture to synergistically reduce the energetic losses during electron-photon conversion and boost the extraction of trapped light in the device. An interfacial nucleation seeding scheme is proposed to control the crystallization process of highly emissive perovskite nanocrystals and suppress the trap-mediated non-radiative recombination losses due to interfacial hydrogen bonding interactions. This manipulation results in a record external quantum efficiency (EQE) of 12.8% for blue PeLEDs emitting at 486 nm, along with the improved spectral stability and operation lifetime. Additionally, the maximum EQE reaches 16.8% after combining an internal outcoupling structure without spectral distortion, which can be further raised to 27.5% when using a lens-based structure on top of the device. We anticipate that our work provides an effective method for its application in high-performance PeLEDs.
