Overcoming the efficiency limitation of semiconductor quantum dot-based light-emitting diodes

Projektinformationen

CQWLED

ID Finanzhilfevereinbarung: 849229

DOI

10.3030/849229

Projekt abgeschlossen

EK-Unterschriftsdatum 11 September 2019

Startdatum 1 Januar 2020

Enddatum 31 Dezember 2024

Finanziert unter

• EXCELLENT SCIENCE - European Research Council (ERC)

Gesamtkosten

€ 1 498 515,00

EU-Beitrag

€ 1 498 515,00

Koordiniert durch

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH
Switzerland

Periodic Reporting for period 4 - CQWLED (Overcoming the efficiency limitation of semiconductor quantum dot-based light-emitting diodes)

Berichtszeitraum: 2024-07-01 bis 2024-12-31

Zusammenfassung vom Kontext und den Gesamtzielen des Projekts

This project aims to understand and engineer light generation and propagation from semiconductor nanocrystals, so that more light can be directed to human eyes in their electroluminescent devices, which covert electricity to light.
It is important to society because there is high demand to use better light source with reduction of blue light that is harmful for human eyes. Light generated from semiconductor nanocrystals is not only potentially more eco-friendly and sustainable, but also generating color-pure light for different applications, significantly reduce the use of blue spectral component in light.
The overall objectives are therefore about fundamental understanding light generation within the semiconductor nanocrystals and how the geometry and electronic structure affects light propagation. Given the fundamental insights gained, we aim to design process and materials for making the light emitting devices that yield color-pure light with highest energy conversion efficiency.

Arbeit, die ab Beginn des Projekts bis zum Ende des durch den Bericht erfassten Berichtszeitraums geleistet wurde, und die wichtigsten bis dahin erzielten Ergebnisse

In combination with multiscale modeling and spectroscopy, we have developed theoretical framework allowing us to predict light propagation in a given semiconductor nanocrystal. We have synthesized semiconductor nanocrystals with chemistry and shape guided by our calculations. The resulting LED devices demonstrate the record-high energy conversion efficiency.

Fortschritte, die über den aktuellen Stand der Technik hinausgehen und voraussichtliche potenzielle Auswirkungen (einschließlich der bis dato erzielten sozioökonomischen Auswirkungen und weiter gefassten gesellschaftlichen Auswirkungen des Projekts)

As compared to state-of-the-art semiconductor nanocrystal light-emitting diodes, we have boosted the maximum energy conversion efficiency over 25%.
We anticipate that further optimization of our synthetic protocols would allow us to fabricate lighting devices with longer lifetime without compromising energy conversion efficiency. The use of more environmentally friendly materials would be also investigated and expected to considerably reduce the content of heavy and rare elements.

The most color-pure green light-emitting diodes using semiconductor nanocrystals