Zero-Threshold Optical Gain in Electrochemically Doped Nanoplatelets and the Physics Behind It.

ABSTRACT: Colloidal nanoplatelets (NPLs) are promising materials for lasing applications. The properties are usually discussed in the framework of 2D materials, where strong excitonic effects dominate the optical properties near the band edge. At the same time, NPLs have finite lateral dimensions such that NPLs are not true extended 2D structures. Here we study the photophysics and gain properties of CdSe/CdS/ZnS core-shell-shell NPLs upon electrochemical n doping and optical excitation. Steady-state absorption and PL spectroscopy show that excitonic effects are weaker in core-shell-shell nanoplatelets due to the decreased exciton binding energy. Transient absorption studies reveal a gain threshold of only one excitation per nanoplatelet. Using electrochemical n doping, we observe the complet

SUBMITTER: Geuchies JJ 

PROVIDER: S-EPMC9706803 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature