High efficiency pure blue perovskite quantum dot light-emitting diodes based on formamidinium manipulating carrier dynamics and electron state filling

Achieving high efficiency and stable pure blue colloidal perovskite quantum dot (QD) light-emitting diodes (LEDs) is still an enormous challenge. This paper presents a room-temperature synthesis method using organic cation composition modification to create high-performance pure blue perovskite quantum dots. FA-CsPb(Cl₀.₅Br₀.₅)₃ QDs exhibit a high PLQY (65%), resulting in pure blue LEDs with a maximum luminance of 1452 cd m⁻² and an external quantum efficiency of 5.01% at 474 nm. The improved performance is attributed to enhanced blue QD emitters and effective charge injection and exciton radiation.

Long Gao, Yilin Zhang, Lijie Gou, Qian Wang, Meng Wang, Weitao Zheng, Yinghui Wang, Hin-Lap Yip, Jiaqi Zhang