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Perovskite Light-Emitting Diodes with an External Quantum Efficiency Exceeding 30%
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-29 , DOI: 10.1002/adma.202302283 Wenhao Bai 1 , Tongtong Xuan 1, 2, 3 , Haiyan Zhao 1 , Haorui Dong 1 , Xinru Cheng 4 , Le Wang 4 , Rong-Jun Xie 1, 2, 3, 5
Advanced Materials ( IF 27.4 ) Pub Date : 2023-05-29 , DOI: 10.1002/adma.202302283 Wenhao Bai 1 , Tongtong Xuan 1, 2, 3 , Haiyan Zhao 1 , Haorui Dong 1 , Xinru Cheng 4 , Le Wang 4 , Rong-Jun Xie 1, 2, 3, 5
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Perovskite light-emitting diodes (PeLEDs) are strong candidates for next-generation display and lighting technologies due to their high color purity and low-cost solution-processed fabrication. However, PeLEDs are not superior to commercial organic light-emitting diodes (OLEDs) in efficiency, as some key parameters affecting their efficiency, such as the charge carrier transport and light outcoupling efficiency, are usually overlooked and not well optimized. Here, ultrahigh-efficiency green PeLEDs are reported with quantum efficiencies surpassing a milestone of 30% by regulating the charge carrier transport and near-field light distribution to reduce electron leakage and achieve a high light outcoupling efficiency of 41.82%. Ni0.9Mg0.1Ox films are applied with a high refractive index and increased hole carrier mobility as the hole injection layer to balance the charge carrier injection and insert the polyethylene glycol layer between the hole transport layer and the perovskite emissive layer to block the electron leakage and reduce the photon loss. Therefore, with the modified structure, the state-of-the-art green PeLEDs achieve a world record external quantum efficiency of 30.84% (average = 29.05 ± 0.77%) at a luminance of 6514 cd m−2. This study provides an interesting idea to construct super high-efficiency PeLEDs by balancing the electron-hole recombination and enhancing the light outcoupling.
中文翻译：
外量子效率超过30%的钙钛矿发光二极管
钙钛矿发光二极管 (PeLED) 因其高色纯度和低成本的溶液加工制造而成为下一代显示和照明技术的有力候选者。然而，PeLED 在效率方面并不优于商业有机发光二极管 (OLED)，因为影响其效率的一些关键参数，例如载流子传输和光耦合效率，通常被忽视并且没有得到很好的优化。据报道，通过调节载流子传输和近场光分布以减少电子泄漏并实现 41.82% 的高光输出耦合效率，超高效率绿色 PeLED 的量子效率超过了 30% 的里程碑。采用高折射率和高空穴载流子迁移率的Ni 0.9 Mg 0.1 O x 薄膜作为空穴注入层以平衡载流子注入，并在空穴传输层和钙钛矿发射层之间插入聚乙二醇层以阻挡电子泄漏并减少光子损失。因此，通过改进的结构，最先进的绿色PeLED在6514 cd m -2 的亮度下实现了30.84%（平均值= 29.05 ± 0.77%）的世界纪录外量子效率。这项研究提供了一个有趣的想法，通过平衡电子空穴复合和增强光输出耦合来构建超高效 PeLED。
更新日期：2023-05-29
中文翻译：
外量子效率超过30%的钙钛矿发光二极管
钙钛矿发光二极管 (PeLED) 因其高色纯度和低成本的溶液加工制造而成为下一代显示和照明技术的有力候选者。然而，PeLED 在效率方面并不优于商业有机发光二极管 (OLED)，因为影响其效率的一些关键参数，例如载流子传输和光耦合效率，通常被忽视并且没有得到很好的优化。据报道，通过调节载流子传输和近场光分布以减少电子泄漏并实现 41.82% 的高光输出耦合效率，超高效率绿色 PeLED 的量子效率超过了 30% 的里程碑。采用高折射率和高空穴载流子迁移率的Ni 0.9 Mg 0.1 O x 薄膜作为空穴注入层以平衡载流子注入，并在空穴传输层和钙钛矿发射层之间插入聚乙二醇层以阻挡电子泄漏并减少光子损失。因此，通过改进的结构，最先进的绿色PeLED在6514 cd m -2 的亮度下实现了30.84%（平均值= 29.05 ± 0.77%）的世界纪录外量子效率。这项研究提供了一个有趣的想法，通过平衡电子空穴复合和增强光输出耦合来构建超高效 PeLED。
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