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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

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Updated: Jun 27, 2026

Compact Quantum Dots for Single-molecule Imaging
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High Power, Efficient, and Stable Quantum Dot-Based Downconverters for SWIR Applications.

Aditya Jagadeesh Malla1, Katerina Nikolaidou1, Miguel Dosil1

  • 1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, 08860 Barcelona, Spain.

ACS Photonics
|February 23, 2026
PubMed
Summary
This summary is machine-generated.

We developed high-power, stable shortwave infrared (SWIR) downconverters using lead sulfide quantum dots (QDs). These cost-effective QD-based SWIR light sources overcome performance limitations of traditional semiconductors.

Keywords:
colloidal quantum dotenergy transferinfrared high power light sourceoptical downconvertersthermal management

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Shortwave infrared (SWIR) light sources are crucial for imaging, spectroscopy, and sensing.
  • High costs of epitaxial semiconductors like InGaAs limit SWIR applications.
  • Quantum dots (QDs) offer a promising, cost-effective alternative due to tunable emission and solution processability.

Purpose of the Study:

  • To develop high-power, stable, and spectrally tunable SWIR downconverters (DCs) using lead sulfide QDs.
  • To overcome performance degradation issues in QD-DCs under high excitation power densities.
  • To create a scalable route for low-cost SWIR light sources.

Main Methods:

  • Utilized Förster resonance energy transfer and photon reabsorption in a binary QD system (mixing two QD sizes).
  • Embedded QDs in a poly(methyl methacrylate) host to mitigate thermal stress.
  • Optimized DCs with distributed Bragg reflectors and sapphire substrates for enhanced light extraction and heat dissipation.

Main Results:

  • Achieved a high photoluminescence quantum yield of 35% in the binary QD system.
  • Demonstrated standalone DCs with an emission power density (EmPD) of 110 mW/cm² at 1380 nm.
  • Reached a record EmPD of 385 mW/cm² at 1380 nm with 10% optical power conversion efficiency and >230 h stability at 190 mW/cm².

Conclusions:

  • Developed high-performance, stable SWIR downconverters based on lead sulfide QDs.
  • Demonstrated a scalable and cost-effective approach for SWIR light sources.
  • Narrowed the performance gap between solution-processed QD-DCs and epitaxial semiconductors.