当前位置：
X-MOL 学术
›
Adv. Funct. 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.)
Highly Efficient Red Perovskite Light-Emitting Diodes with Reduced Efficiency Roll-Off Enabled by Manipulating Crystallization of Quasi-2D Perovskites
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-07-05 , DOI: 10.1002/adfm.202205707 Dengliang Zhang 1 , Lingfeng Chao 2 , Guangrong Jin 1 , Zhaohui Xing 1 , Wei Hong 1 , Yonghua Chen 2 , Lei Wang 3 , Jiangshan Chen 1 , Dongge Ma 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2022-07-05 , DOI: 10.1002/adfm.202205707 Dengliang Zhang 1 , Lingfeng Chao 2 , Guangrong Jin 1 , Zhaohui Xing 1 , Wei Hong 1 , Yonghua Chen 2 , Lei Wang 3 , Jiangshan Chen 1 , Dongge Ma 1
Affiliation
|
CsPbI3 is attractive for efficient and cost-effective red perovskite light-emitting diodes (PeLEDs), but its black phases still suffer from the metastable structure. The incorporation of large-size organic cations has been widely used to construct quasi-2D perovskites to stabilize the black phases. However, the multiple-phase quasi-2D perovskites usually show abundant interface defects and enhanced Auger recombination, leading to the low luminance and serious efficiency roll-off in PeLEDs. Herein, highly efficient red PeLEDs are demonstrated with high luminance and low efficiency roll-off realized by manipulating the crystallization kinetics of phenethylamine bromide (PEABr) incorporated CsPbI3. PEABr-CsPbI3 nanocrystal films with much larger and more oriented β-CsPbIxBr3-x grains are successfully obtained through appropriately increasing PbI2 content and coordinating with anti-solvent treatment. The carrier recombination dynamics investigations reveal that the trap-assisted recombination and Auger recombination are greatly reduced in the passivation-free PEABr-CsPbI3 films by rational crystallization regulation. A peak external quantum efficiency (EQE) up to 19.6% is achieved in the red PeLEDs with a stable emission peak at 672 nm, which is maintained as high as 17.2% at a high luminance of over 1000 cd m−2. This study could shed light on modulating the crystallization kinetics of pervoskites to optimize carrier recombination dynamics toward high performance PeLEDs.
中文翻译：
通过控制准二维钙钛矿的结晶，可降低效率滚降的高效红色钙钛矿发光二极管
CsPbI 3对于高效且具有成本效益的红色钙钛矿发光二极管 (PeLED) 具有吸引力，但其黑色相仍受亚稳态结构的影响。大尺寸有机阳离子的掺入已被广泛用于构建准二维钙钛矿以稳定黑色相。然而，多相准二维钙钛矿通常表现出丰富的界面缺陷和增强的俄歇复合，导致 PeLED 的低亮度和严重的效率滚降。在此，通过控制掺入 CsPbI 3的苯乙胺溴化物 (PEABr) 的结晶动力学，证明了高效的红色 PeLED 具有高亮度和低效率滚降。PEABr-CsPbI 3通过适当增加PbI 2含量并配合反溶剂处理，成功获得了β-CsPbI x Br 3-x晶粒尺寸更大、取向度更高的纳米晶薄膜。载流子复合动力学研究表明，通过合理的结晶调控，无钝化PEABr-CsPbI 3薄膜中的陷阱辅助复合和俄歇复合大大减少。在红色 PeLED 中实现了高达 19.6% 的峰值外部量子效率 (EQE)，在 672 nm 处具有稳定的发射峰，在超过 1000 cd m -2的高亮度下保持高达 17.2%. 这项研究可以阐明调节钙钛矿的结晶动力学，以优化载流子重组动力学以实现高性能 PeLED。
更新日期：2022-07-05
中文翻译：
通过控制准二维钙钛矿的结晶，可降低效率滚降的高效红色钙钛矿发光二极管
CsPbI 3对于高效且具有成本效益的红色钙钛矿发光二极管 (PeLED) 具有吸引力，但其黑色相仍受亚稳态结构的影响。大尺寸有机阳离子的掺入已被广泛用于构建准二维钙钛矿以稳定黑色相。然而，多相准二维钙钛矿通常表现出丰富的界面缺陷和增强的俄歇复合，导致 PeLED 的低亮度和严重的效率滚降。在此，通过控制掺入 CsPbI 3的苯乙胺溴化物 (PEABr) 的结晶动力学，证明了高效的红色 PeLED 具有高亮度和低效率滚降。PEABr-CsPbI 3通过适当增加PbI 2含量并配合反溶剂处理，成功获得了β-CsPbI x Br 3-x晶粒尺寸更大、取向度更高的纳米晶薄膜。载流子复合动力学研究表明，通过合理的结晶调控，无钝化PEABr-CsPbI 3薄膜中的陷阱辅助复合和俄歇复合大大减少。在红色 PeLED 中实现了高达 19.6% 的峰值外部量子效率 (EQE)，在 672 nm 处具有稳定的发射峰，在超过 1000 cd m -2的高亮度下保持高达 17.2%. 这项研究可以阐明调节钙钛矿的结晶动力学，以优化载流子重组动力学以实现高性能 PeLED。
京公网安备 11010802027423号