Related Experiment Video
Updated: Jun 13, 2025
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Tuning the Triplet State of Ligands on FAPbBr3 Quantum Dots toward Low-Threshold Distributed Feedback Lasers
Guitai Fan1, Feng Zhang1, Zilong Lu1
1School of Physics and Optoelectronic Engineering, Beijing University of Technology, Beijing 100124, China.
Abstract:
Herein, the influence of ligand triplet energy on carrier transfer dynamics and optical gain behaviors of quantum dots (QDs) was investigated using FAPbBr3 QDs capped by phenylethylamine (PEA) and 2-(2-naphthyl)ethylamine (NEA) molecules. Through analysis of steady-state and transient spectroscopic data as well as the energy level structure of QD-ligand complexes, a very close triplet energy gap between QDs and NEA was demonstrated, which could act as an effective energy transfer channel between QDs and ligands. The setup of this energy-transfer channel greatly reduced the carrier density in QDs under high pump fluences, contributing to a lasing threshold as low as 6.1 μJ/cm2. The proposed ligand triplet regulation strategy provided new insights into carrier recombination dynamic control and may also be useful for other optoelectronic devices such as solar cells, light-emitting diodes, and photodetectors.
