Related Experiment Video
Updated: Dec 7, 2025
06:25
Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
Published on: November 7, 2025
231
Solid-State Thin-Film Broadband Short-Wave Infrared Light Emitters
Santanu Pradhan1, Mariona Dalmases1, Gerasimos Konstantatos1,2
1ICFO-Institut de Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, 08860, Spain.
Advanced Materials (Deerfield Beach, Fla.)
|September 30, 2020
Summary
Researchers developed novel broadband short-wave infrared (SWIR) light-emitting diodes (LEDs) using colloidal quantum dots. These emitters offer a wide spectral range and pave the way for integrated SWIR spectroscopy applications.
Area of Science:
- Optoelectronics
- Materials Science
Background:
- Solid-state visible light emitters have advanced lighting, but infrared counterparts lag.
- Existing infrared emitters have limited bandwidth and integration challenges.
Purpose of the Study:
- To develop novel broadband emitters for the short-wave infrared (SWIR) spectrum.
- To demonstrate the first electrically driven broadband SWIR LED.
Main Methods:
- Engineered stacks of multi-bandgap colloidal quantum dots (CQDs) were used.
- Phosphor-converted LEDs were fabricated and characterized.
Main Results:
- Achieved broadband SWIR emission from 1050-1650 nm with a 400 nm bandwidth.
- Delivered 14 mW optical power with 5.4% quantum efficiency and 13% power conversion efficiency.
- Demonstrated the first electrically driven broadband SWIR LED.
Conclusions:
- Colloidal quantum dot stacks enable efficient broadband SWIR light emission.
- This technology is suitable for on-chip spectrometers and low-cost manufacturing.
- Applications demonstrated in food and material identification via SWIR spectroscopy.
