High-Radiance Near-Infrared Perovskite Light-Emitting Diodes with Improved Roll-Off Degradation,Advanced Optical Materials

当前位置： X-MOL 学术 › Adv. Opt. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

High-Radiance Near-Infrared Perovskite Light-Emitting Diodes with Improved Roll-Off Degradation
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2022-12-15 , DOI: 10.1002/adom.202202043
Maotao Yu ₁ , Yongqiang Ji ₁ , Haoming Yan ₁ , Jinhao Hu ₁ , Shunde Li ₁ , Hongyu Xu ₁ , Peng Chen ₁ , Lichen Zhao ₁ , Shuzhen Guan ₂ , Xiaoyin Bi ₂ , Xiaoyu Yang ₁ , Shuang Jia ₃ , Chang Yi ₂ , Deying Luo ₄ , Jianpu Wang ₂ , Zheng‐Hong Lu ₄ , Qihuang Gong _{1,

5,

6} , Rui Zhu _{1,

5,

6}

Affiliation

The external quantum efficiency (EQE) of state-of-the-art near-infrared perovskite light-emitting diodes (PeLEDs) is now approaching the limit set by the out-coupling efficiency. However, there is plenty of room for enhancing these devices’ radiance and the EQE roll-off. This work reports how conductive and passivating additives construct efficient high-radiance near-infrared PeLEDs with improved EQE roll-off. Specifically, the synergistic effect of 1,4-phenylenediacetic acid (PDA) and 5-aminovaleric acid (5-AVA) is used to regulate the quality of the perovskite emissive layer, thereby enhancing the roll-off threshold of injection currents (a value at which the device EQE or radiance starts degrading). According to in situ structural evolution analyses from the perovskite precursor to the perovskite crystal, the presence of PDA within the perovskite precursor solution can produce an intermediate phase with 5-AVA and formanmidinium cation, which can retard the perovskite nucleation and crystal growth, leading to improved perovskite film quality. The resulting champion PeLED delivers among the highest radiance of 505 W sr⁻¹ m⁻² and a peak EQE of 17.56%. More importantly, the improved PeLED shows a well-retained radiance of 80% at a current injection density of up to ≈1800 mA cm⁻¹, opening a new avenue for high-radiance PeLEDs with improved roll-off degradation.

中文翻译：

具有改进滚降退化的高辐射近红外钙钛矿发光二极管

最先进的近红外钙钛矿发光二极管 (PeLED) 的外量子效率 (EQE) 现在正接近由外耦合效率设定的极限。然而，这些器件的辐射亮度和 EQE 衰减仍有很大提升空间。这项工作报告了导电和钝化添加剂如何构建具有改进的 EQE 滚降的高效高辐射近红外 PeLED。具体来说，利用1,4-苯二乙酸（PDA）和5-氨基戊酸（5-AVA）的协同作用来调节钙钛矿发光层的质量，从而提高注入电流的滚降阈值（a值器件 EQE 或辐射率开始下降时）。根据从钙钛矿前体到钙钛矿晶体的原位结构演化分析，钙钛矿前体溶液中 PDA 的存在可以产生具有 5-AVA 和甲脒阳离子的中间相，这可以延迟钙钛矿成核和晶体生长，从而提高钙钛矿薄膜的质量。由此产生的冠军 PeLED 提供了 505 W sr 的最高辐射⁻¹ m ⁻²和峰值EQE 为17.56%。更重要的是，改进后的 PeLED 在高达 ≈1800 mA cm ^-1的电流注入密度下显示出 80% 的良好保持的辐射率，为高辐射率 PeLED 开辟了一条新途径，并改善了滚降退化。

更新日期：2022-12-15

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南