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

Informations projet

CQWLED

N° de convention de subvention: 849229

DOI

10.3030/849229

Projet clôturé

Date de signature de la CE 11 Septembre 2019

Date de début 1 Janvier 2020

Date de fin 31 Decembre 2024

Financé au titre de

• EXCELLENT SCIENCE - European Research Council (ERC)

Coût total

€ 1 498 515,00

Contribution de l’UE

€ 1 498 515,00

Coordonné par

EIDGENOESSISCHE TECHNISCHE HOCHSCHULE ZUERICH
Switzerland

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

Période du rapport: 2024-07-01 au 2024-12-31

Résumé du contexte et des objectifs généraux du projet

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.

Travail effectué depuis le début du projet jusqu’à la fin de la période considérée dans le rapport et principaux résultats atteints jusqu’à présent

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.

Progrès au-delà de l’état des connaissances et impact potentiel prévu (y compris l’impact socio-économique et les conséquences sociétales plus larges du projet jusqu’à présent)

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