Internal moisture barrier layer for improving high-humidity reliability of miniature light emitting diode die without encapsulation.
Opt Express
; 31(20): 33732-33740, 2023 Sep 25.
Article
em En
| MEDLINE
| ID: mdl-37859146
ABSTRACT
Atomic layer deposited Al2O3 films are incorporated into miniature light emitting diodes (mini-LEDs) as an internal moisture barrier layer. The experimental results show that the water vapor transmission rate reaches ≤10-4â
g/m2/day when the Al2O3 thickness is ≥40â
nm. The mini-LED with a 40â
nm-thick Al2O3 layer shows negligible degradation after 1000â
h of 85°C/85% relative humidity testing, whereas the device without an Al2O3 layer fails after only 500â
h due to delamination occurring at the GaN surface. Current-voltage characteristics of the device without an Al2O3 moisture barrier layer indicate an increase in series resistance and ideality factor. This study provides a simple, light-weighting method to have a satisfactory encapsulation function for miniature LEDs.
Texto completo:
1
Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article