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Photoluminescence: Applications

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Related Experiment Video

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Electrically control amplified spontaneous emission in colloidal quantum dots.

Junhong Yu¹, Sushant Shendre¹, Weon-Kyu Koh¹

¹LUMINOUS! Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore.

Science Advances

|November 7, 2019

Summary

Colloidal quantum dots (CQDs) show controllable amplified spontaneous emission (ASE) thresholds. Applying an electric field tunes CQD charging, reducing the ASE threshold by 10% and paving the way for electrically pumped CQD lasers.

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Area of Science:

Materials Science
Optoelectronics
Quantum Physics

Background:

Colloidal quantum dots (CQDs) offer efficient photoluminescence and tunable emission for light amplification.
Band-edge state degeneracy in CQDs necessitates multiple excitons for population inversion, leading to increased lasing thresholds due to Auger recombination.

Purpose of the Study:

To demonstrate controllable amplified spontaneous emission (ASE) thresholds in CQD devices using external electric fields.
To investigate the impact of negative charging on exciton recombination dynamics and ASE thresholds in CQDs.

Main Methods:

Fabrication of a device exposing CQD films to an external electric field.
Experimental measurement of ASE thresholds under varying electric field conditions.
Kinetic equation modeling to analyze exciton recombination dynamics.

Main Results:

Singly charged CQDs lower the ASE threshold by providing a pre-existing electron in the conduction band.
Doubly charged CQDs exhibit enhanced Auger recombination, which hinders ASE.
A 10% reduction in ASE threshold was achieved with approximately 17% CQD population charging.

Conclusions:

External electric fields can effectively control ASE thresholds in CQD devices by manipulating exciton charging.
This work provides a pathway for managing exciton recombination dynamics in CQDs.
The findings contribute to the development of electrically pumped CQD lasers.