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High Performance Quasi-2D Perovskite Sky-Blue Light-Emitting Diodes Using a Dual-Ligand Strategy.
Small ( IF 13.0 ) Pub Date : 2020-06-25 , DOI: 10.1002/smll.202002940
Fuzhi Wang 1 , Zhenye Wang 1 , Wenda Sun 1 , Zhibin Wang 1 , Yiming Bai 1 , Tasawar Hayat 2 , Ahmed Alsaedi 2 , Zhan'ao Tan 3
Affiliation  

For quasi‐2D perovskite light‐emitting diodes, the introduction of insulating bulky cation reduces the charge transport property, leading to lowered brightness and increased turn‐on voltage. Herein, a dual‐ligand strategy is adopted to prepare perovskite films by using an appropriate ratio of i‐butylammonium (iBA) and phenylethylammonium (PEA) as capping ligands. The introduction of iBA enhances the binding energy of the ligands on the surface of the quasi‐2D perovskite, and effectively controls the proportion of 2D perovskite to allow more efficient energy transfer, resulting in the great enhancement of the electric and luminescent properties of the perovskite. The photoluminescence (PL) mapping of the perovskite films exhibits that enhanced photoluminescence performance with better uniformity and stronger intensity can be achieved with this dual‐ligand strategy. By adjusting the proportion of the two ligands, sky‐blue perovskite light‐emitting diodes (PeLEDs) with electroluminescence (EL) peak located 485 nm are achieved with a maximum luminance up to 1130 cd m−2 and a maximum external quantum efficiency (EQE) up to 7.84%. In addition, the color stability and device stability are significantly enhanced by using a dual‐ligand strategy. This simple and feasible method paves the way for improving the performance of quasi‐2D PeLEDs.

中文翻译:

采用双配体策略的高性能准2D钙钛矿天蓝色发光二极管。

对于准2D钙钛矿型发光二极管,引入绝缘的笨重阳离子会降低电荷传输性能,从而导致亮度降低和开启电压升高。在本文中,采用双配体策略通过使用适当比例的异丁铵(iBA)和苯乙铵(PEA)作为封盖配体来制备钙钛矿薄膜。iBA的引入增强了准2D钙钛矿表面上配体的结合能,并有效控制了2D钙钛矿的比例,从而实现了更有效的能量转移,从而极大地增强了钙钛矿的电和发光性能。钙钛矿薄膜的光致发光(PL)映射显示,使用这种双配体策略可以实现增强的光致发光性能,具有更好的均匀性和更强的强度。通过调整两个配体的比例,可以实现电致发光(EL)峰值位于485 nm的天蓝色钙钛矿发光二极管(PeLED),最大亮度可达1130 cd m-2和最大外部量子效率(EQE)高达7.84%。此外,通过使用双配体策略,可以显着提高颜色稳定性和设备稳定性。这种简单可行的方法为改善准2D PeLED的性能铺平了道路。
更新日期:2020-08-14
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