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Ultralow-Threshold Single-Mode Lasing from Phase-Pure CdSe/CdS Core/Shell Quantum Dots.

Chen Liao1, Ruilin Xu1, Yanqing Xu2

  • 1Advanced Photonic Center, Southeast University , Nanjing 210096, China.

The Journal of Physical Chemistry Letters
|December 16, 2016
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dot (QD) lasers are hindered by Auger recombination (AR). New CdSe/CdS core/shell QDs with thicker shells significantly reduce AR, enabling low-threshold microlasers.

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Auger recombination (AR) is a major obstacle in developing efficient colloidal quantum dot (QD) lasers.
  • Controlling QD properties is crucial for overcoming AR and achieving laser functionality.

Purpose of the Study:

  • To synthesize phase-pure wurtzite CdSe/CdS core/shell QDs with tunable shell thicknesses.
  • To investigate the impact of shell thickness on AR rates and optical gain properties.
  • To fabricate and characterize QD-based microlasers with low thresholds.

Main Methods:

  • Synthesis of CdSe/CdS core/shell QDs with controlled wurtzite phase and shell thickness.
  • Characterization of QD interfaces using advanced spectroscopy.
  • Ultrafast transient absorption spectroscopy to measure optical gain lifetime and bandwidth.
  • Fabrication and testing of QD microlasers.

Main Results:

  • A decrease in AR rates by over three orders of magnitude with increasing CdS shell thickness.
  • A minimum amplified spontaneous emission threshold of 16 μJ/cm² for QDs with an 11-monolayer CdS shell.
  • Record optical gain lifetime (>1000 ps) and bandwidth (>170 nm).
  • Fabricated microlasers demonstrated single-mode operation with an ultralow threshold of ~2 μJ/cm².

Conclusions:

  • Phase-pure CdSe/CdS core/shell QDs with controlled interfaces effectively suppress Auger recombination.
  • These QDs exhibit superior optical gain properties, paving the way for practical QD lasers.
  • The developed QD microlasers show promising performance for future optoelectronic applications.