Towards Engineering Intrinsic Linewidths and Line-Broadening in Perovskite Nanoplatelets

Abstract

Perovskite nanoplatelets possess extremely narrow absorption and emission linewidths, which are crucial characteristics for many optical applications. However, their underlying intrinsic and extrinsic line-broadening mechanisms are poorly understood. Here, we apply multi-dimensional coherent spectroscopy to determine the homogeneous line-broadening of colloidal perovskite nanoplatelet ensembles. We demonstrate control of not only their intrinsic linewidths, but also control of various broadening mechanisms by tuning the platelet geometry. Remarkably, we find that decreasing nanoplatelet thickness by a single polyhedral layer results in a 2-fold reduction of the inhomogeneous linewidth and a 3-fold reduction of the intrinsic homogeneous linewidth to the sub-meV regime. In addition, our measurements suggest homogeneously broadened exciton resonances in 3-layer (but not necessarily 4-layer) nanoplatelets at room-temperature.

References in corpus (3)

• Metal Halide Perovskite Nanocrystals: Synthesis, Post-Synthesis Modifications and Their Optical Properties
• Spectroscopic Signatures of Electron-Phonon Coupling in Silicon-Vacancy Centers in Diamond
• Partially-Bright Triplet Excitons in Perovskite Nanocrystals

Cited by in corpus (5)

• High-resolution two-dimensional electronic spectroscopy reveals homogeneous line profiles in isolated nanoparticles
• Homogeneous optical linewidths in hybrid Ruddlesden-Popper metal halides can only be measured using nonlinear spectroscopy
• An Exact Expression for Multidimensional Spectroscopy of a Spin-Boson Hamiltonian
• Measuring Exciton Fine-Structure in Perovskite Nanocrystal Ensembles
• Quantum beats of exciton-polarons in CsPbI3 perovskite nanocrystals