Quasi-two dimensional Ruddlesden-Popper halide perovskites for laser applications

Abstract

Quasi-two-dimensional (2D) Ruddlesden–Popper (RP) halide perovskites, as a kind of emerged two-dimensional layered materials, have recently achieved great attentions in lasing materials field owing to their large exciton binding energy, high emission yield, large optical gain, and wide-range tuning of optical bandgap. This review will introduce research progresses of RP halide perovskites for lasing applications in aspects of materials, photophysics, and devices with emphasis on emission and lasing properties tailored by the molecular composition and interface. The materials, structures and fabrications are introduced in the first part. Next, the optical transitions and amplified spontaneous emission properties are discussed from the aspects of electronic structure, exciton, gain dynamics, and interface tailoring. Then, the research progresses on lasing devices are summarized and several types of lasers including VCSEL, DFB lasers, microlasers, random lasers, plasmonic lasers, and polariton lasers are discussed. At last, the challenges and perspectives would be provided.

Long-Range Self-Hybridized Exciton-Polaritons in Two-Dimensional Ruddlesden–Popper Perovskites

“…Lead-halide perovskites have proven to be a suitable alternative due to their remarkably easy synthesis, direct band gaps, high optical gain, and high oscillator strength. , In particular, of special interest are quasi-two-dimensional Ruddlesden–Popper organo-metal halide perovskite (RPP) layers that have been applied in solar cells in 2015 and have been used for realizations of photodetectors, LEDs, and lasers. − These layers are quantum-well-structured materials of a certain number of perovskite layers (well), which are separated by spacer molecules (barrier) along the z axis. − For these quasi-two-dimensional materials, exceptionally high exciton binding energies of several hundred millielectronvolts have been reported in bulk crystals − and connected to quantum confinement, decreasing the likelihood of electron–hole pairs dissociating at charge separation interfaces, which additionally results in a high emission quantum yield. For perovskites, polariton formation has been realized with a variety of photonic structures, such as plasmonic lattices and microcavities, − with superfluidity claimed to be reached in the latter systems .…”