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Photoluminescence: Fluorescence and Phosphorescence

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...

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Related Experiment Video

Updated: Jul 11, 2025

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

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Published on: October 13, 2017

Gate Controlled Excitonic Emission in Quantum Dot Thin Films.

I K M Reaz Rahman^1,2, Shiekh Zia Uddin^1,2, Matthew Yeh^1,2

¹Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, United States.

|November 7, 2023

Summary

Controlling charged trions in colloidal quantum dot (QD) films enhances luminescence efficiency. A novel metal-oxide-semiconductor capacitor device allows voltage-controlled modulation of QD brightness, impacting applications in electrochromics.

Keywords:

carrier lifetime exciton ionic gating quantum dot trion

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

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Published on: November 1, 2013

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Last Updated: Jul 11, 2025

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Published on: October 13, 2017

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Nanofabrication of Gate-defined GaAs/AlGaAs Lateral Quantum Dots

Published on: November 1, 2013

Area of Science:

Materials Science
Nanotechnology
Optoelectronics

Background:

Charged trions in colloidal quantum dot (QD) thin films reduce luminescence quantum efficiency due to nonradiative recombination.
Controlling charged trion formation is crucial for fundamental understanding and optimizing QD performance.

Purpose of the Study:

To investigate the effect of background charge on luminescence efficiency and lifetime in QD thin films.
To demonstrate a device for reversible control of charged trion concentration and luminescence.

Main Methods:

Fabrication of a metal-oxide-semiconductor capacitor using CdSe/CdS QD thin films.
Applying gate voltage to control the concentration ratio of charged and neutral quasiparticles.
Performing simultaneous steady-state and time-resolved photoluminescence measurements.

Main Results:

Photoluminescence intensity was modulated by up to two orders of magnitude.
Effective luminescence lifetime showed a corresponding change with gate voltage.
Chip-scale modulation of brightness was achieved, effectively turning photoluminescence on and off.

Conclusions:

A QD-based metal-oxide-semiconductor capacitor enables effective control over luminescence efficiency and lifetime.
This voltage-controlled modulation highlights potential for applications in advanced electrochromic devices.