Article Dans Une Revue ACS photonics Année : 2023

Influence of shape and size on GaN/InGaN µLED light emission: a competition between sidewall defects and light extraction efficiency

Résumé

Micro light-emitting diodes (µLEDs) are expected to revolutionize the display technology due to their advantages over the current LCD and OLED technology and the possibility to use them in micro displays, visible light communications and optogenetics. One of the main challenges of this emergent technology is the efficiency drop with the reduction of LED size due to sidewall defects. In this paper, we study the size and shape dependence of the external quantum efficiency (EQE) by cathodoluminescence measurements at room temperature and 10 K. Our results show that, for small µLEDs (between 2.5 and 10 µm width), there is an optimal intermediate LED size for which the light emission is maximized, which we attribute to a competition between the light extraction efficiency (which decreases with LED size) and the internal quantum efficiency (which increases with LED size). In contrast to most prior studies that typically examine either IQE or LEE with respect to size for larger LEDs, our work stands out by examining the interplay between IQE and LEE for µLEDs below 10 µm. These results are of high relevance for the design of µLED arrays and show the need for understanding the evolution of light extraction efficiency and sidewall non-radiative recombination with LED geometry and size.
Fichier principal
Vignette du fichier
P. Gonzalez-Izquierdo paper GaN InGaN mesas - circular square -correctionsReviewers_final.pdf (1.16 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

cea-04664654 , version 1 (30-07-2024)

Identifiants

Citer

Palmerina Gonzalez Izquierdo, Névine Rochat, Davide Zoccarato, Fabian Rol, Julia Simon, et al.. Influence of shape and size on GaN/InGaN µLED light emission: a competition between sidewall defects and light extraction efficiency. ACS photonics, 2023, 10, pp.4031-4037. ⟨10.1021/acsphotonics.3c00971⟩. ⟨cea-04664654⟩
29 Consultations
44 Téléchargements

Altmetric

Partager

More