期刊
NANOSCALE
卷 12, 期 3, 页码 1571-1579出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr08616a
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资金
- National Natural Science Foundation of China [61974006]
- Shenzhen Science and Technology Innovation Commission [JCYJ20160229122349365, JCYJ2017041250857611, GJHZ20180420180717270]
Multiple cation-substitution is an effective method to improve the stability of organic-inorganic hybrid perovskite thin-films. Here, we apply this approach to quasi two-dimensional (quasi-2D) perovskite materials, and investigate the effect of Cs and K doping on the performance of quasi-2D perovskite LEDs (PeLEDs). It is found that Cs significantly reduces the efficiency roll-off of quasi-2D PLEDs at high current density, which leads to a high current efficiency (CE) - even at an operation current density as high as 1000 mA cm(-2). In addition, the incorporation of a small amount of K further increases the device quantum efficiency thanks to its passivation effect. As a result, our green PeLED, which is based on a multi-cation quasi-2D perovskite, reaches a brightness of 45 600 cd m(-2), and a maximum CE of 22.5 cd A(-1). The approach introduced in this work has great potential to enhance the performance of quasi-2D perovskite light-emitting diodes.
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