High-Efficiency Perovskite Quantum-Dot Light-Emitting Devices by Effective Washing Process and Interfacial Energy Level Alignment
High-Efficiency Perovskite Quantum-Dot Light-Emitting Devices by Effective Washing Process and Interfacial Energy Level Alignment
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DOI：
10.1021/acsami.7b03382
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发表时间：
2017-05-31
影响因子：
9.5
通讯作者：
Kido, Junji
中科院分区：
文献类型：
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作者：
Chiba, Takayuki;Hoshi, Keigo;Kido, Junji
无机钙钛矿量子点（PeQDs）由于具有窄带发射、高光致发光量子产率（PLQYs）、颜色可调性和溶液可加工性等优点，在薄膜显示和固态照明领域受到广泛关注。本文采用含乙酸丁酯（AcOBu）的酯溶剂对PeQDs进行清洗，去除PeQDs上多余的配体，制备了低驱动电压、高效率的CsPbBr3 PeQDs发光器件（peqd - led）。用AcOBu洗涤CsPbBr3 PeQDs薄膜的PLQY为42%，发光窄，半峰全宽度为19 nm。我们还演示了PeQD-LED的能级对齐，以便从邻近的注入层有效地注入peqd。采用acobu清洗peqd的PeQD-LED的最大功率效率为31.7 lm W-1， EQE为8.73%。通过去除配体和器件结构中的能级对准来控制界面peqd是获得薄膜态高plqy和器件效率的有前途的方法。
All inorganic perovskites quantum dots (PeQDs) have attracted much attention for used in thin film display applications and solid-state lighting applications, owing to their narrow band emission with high photoluminescence quantum yields (PLQYs), color tunability, and solution processability. Here, we fabricated low-driving-voltage and high-efficiency CsPbBr3 PeQDs light-emitting devices (PeQD-LEDs) using a PeQDs washing process with an ester solvent containing butyl acetate (AcOBu) to remove excess ligands from the PeQDs. The CsPbBr3 PeQDs film washed with AcOBu exhibited a PLQY of 42%, and a narrow PL emission with a full width at half-maximum of 19 nm. We also demonstrated energy level alignment of the PeQD-LED in order to achieve effective hole injection into PeQDs from the adjacent hole injection layer. The PeQD-LED with AcOBu-washed PeQDs exhibited a maximum power efficiency of 31.7 lm W-1 and EQE of 8.73%. Control of the interfacial PeQDs through ligand removal and energy level alignment in the device structure are promising methods for obtaining high PLQYs in film state and high device efficiency.