Jiweon Kim1,Ilgeum Lee1,Lina Quan2,Edward Sargent3,Seung Soon Jang4,Dong Ha Kim1
Ewha Womans University1,Virginia Tech2,University of Toronto3,Georgia Institute of Technology4
Jiweon Kim1,Ilgeum Lee1,Lina Quan2,Edward Sargent3,Seung Soon Jang4,Dong Ha Kim1
Ewha Womans University1,Virginia Tech2,University of Toronto3,Georgia Institute of Technology4
Recently, perovskite light-emitting diodes (PeLEDs) have promoted considerable research interest as a next-generation LED that can replace the existing OLED and QLED due to the attractive properties of metal halide perovskite (MLH) materials such as outstanding carrier mobility, bandgap tunablity, great chemical flexibility, and remarkable color purity. However, MLH has yet met the critical requirement for viable LED devices such as inferior moisture stability, stable blue emitter, and cost-effective large area fabrication. To remedy the disadvantage, quasi-2D perovskites, e.g. (PEA)<sub>2</sub>(MA)<sub>n-1</sub>Pb<sub>n</sub>Br<sub>3n+1</sub> have been proposed that evidenced improved humid-stability and tunable optoelectronic properties. In this respect, here, we show a generalized strategy to develop Br-based blue quasi-2D perovskites with enhanced stability and spectral tunability. By controlling the ratio of cation spacers, we could establish a protocol to fine-tune the spectral range of the blue emissive perovskites which may open a pathway toward commercialized PeLEDs.