Huang Yuanlong, Zhu Jiaxing, Li Jinghui, Luo Jiajun, Du Peipei, Song Boxiang, Tang Jiang
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
School of Integrated Circuits, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
ACS Appl Mater Interfaces. 2024 Mar 27;16(12):15004-15010. doi: 10.1021/acsami.3c17082. Epub 2024 Mar 12.
Perovskite light-emitting diodes (PeLEDs) have shown great potential in the display domain due to their wide color gamut, narrow emission, and low cost. In current PeLEDs manufacturing methods, thermal evaporation shows great competitiveness with its advantages of easy patterning, production line compatibility, and solvent-free processability. However, the development of thermally evaporated blue PeLEDs is limited by their low radiative recombination rate and high defect density. Herein, we report high-performance thermally evaporated blue PeLEDs by in situ introduction of ammonium cations. We confirm that phenethylammonium (PEA) has lower adsorption energy, which significantly reduces the low- phases in a quasi-2D perovskite film. The energy transfer rate is also promoted by the PEA addition. As a result, we fabricate blue PeLEDs with an external quantum efficiency of 1.56% by thermal evaporation. The strategy of arranging phase distribution could benefit the industrialization of full-color PeLEDs.
钙钛矿发光二极管（PeLEDs）因其色域广、发射窄和成本低而在显示领域展现出巨大潜力。在当前的PeLEDs制造方法中，热蒸发因其易于图案化、与生产线兼容以及无溶剂可加工性等优点而具有很强的竞争力。然而，热蒸发蓝色PeLEDs的发展受到其低辐射复合率和高缺陷密度的限制。在此，我们报告了通过原位引入铵阳离子制备的高性能热蒸发蓝色PeLEDs。我们证实苯乙铵（PEA）具有较低的吸附能，这显著减少了准二维钙钛矿薄膜中的低相。PEA的添加还促进了能量转移速率。结果，我们通过热蒸发制备出了外部量子效率为1.56%的蓝色PeLEDs。排列相分布的策略有利于全彩PeLEDs的产业化。
