Yang Ming, Wang Nana, Zhang Shuting, Zou Wei, He Yarong, Wei Yingqiang, Xu Mengmeng, Wang Jianpu, Huang Wei
Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University (NanjingTech) , 30 South Puzhu Road , Nanjing 211816 , China.
Shaanxi Institute of Flexible Electronics (SIFE) , Northwestern Polytechnical University (NPU) , 127 West Youyi Road , Xi'an 710072 , Shaanxi , China.
J Phys Chem Lett. 2018 Apr 19;9(8):2038-2042. doi: 10.1021/acs.jpclett.8b00600. Epub 2018 Apr 9.
Mixed-formamidinium (FA) and -cesium (Cs) cations were used to fabricate multiple quantum well (MQW) perovskite light-emitting diodes (PeLEDs). The partial substitution of FA with Cs facilitates the formation of wider quantum wells, which can effectively reduce efficiency roll-off by suppressing Auger recombination. The device has a peak external quantum efficiency (EQE) of 7.8% at a current density of 125 mA cm, maintaining an EQE of ∼6.6% at a high current density of 500 mA cm. Due to the improved stability of mixed-cation structure, we achieve a PeLED device with a lifetime of ∼31 h under a constant current density of 10 mA cm.
采用混合甲脒（FA）和铯（Cs）阳离子来制备多量子阱（MQW）钙钛矿发光二极管（PeLED）。用Cs部分替代FA有助于形成更宽的量子阱，这可以通过抑制俄歇复合有效地降低效率滚降。该器件在电流密度为125 mA/cm²时的峰值外量子效率（EQE）为7.8%，在500 mA/cm²的高电流密度下保持约6.6%的EQE。由于混合阳离子结构稳定性的提高，我们实现了在10 mA/cm²的恒定电流密度下寿命约为31小时的PeLED器件。
