Room temperature exciton-polaritons in high-quality 2D Ruddlesden–Popper perovskites (BA)2(MA)n-1PbnI3n<b>+</b>1 (n <b>=</b> 3, 4)
Chenxing Ouyang, Yao Li, Xianwei Fu, Zhouxiaosong Zeng, Lanyu Huang, Siman Liu, Xiao Wang, Tingge Gao, Anlian Pan
Abstract
Due to large binding energy and oscillator strength, 2D Ruddlesden–Popper perovskites are promising materials for the realization of room temperature coupled exciton-polaritons. Here, we demonstrate room temperature exciton-polaritons in high-quality exfoliated 2D RPP (BA)2(MA)n−1PbnI3n+1 (n = 3, 4) flakes without the use of external Distributed Bragg Reflectors. By angle-resolved PL spectroscopy, we obtain multi-mode low polariton branches and the Rabi splitting in the range of about 160 meV–180 meV for n = 3 and n = 4 flakes. The realization of room temperature exciton-polaritons in 2D RPPs with a large n value provides a potential platform for polaritonic device applications.