88 0

Enhanced Brightness and Device Lifetime of Quantum Dot Light-Emitting Diodes by Atomic Layer Deposition

Title
Enhanced Brightness and Device Lifetime of Quantum Dot Light-Emitting Diodes by Atomic Layer Deposition
Author
오누리
Keywords
atomic layer deposition; device lifetime; interfaces; quantum dot light-emitting diodes (QD-LEDs); ZnO
Issue Date
2020-05
Publisher
WILEY
Citation
ADVANCED MATERIALS INTERFACES, v. 7, no. 12, article no. 2000343
Abstract
Colloidal quantum dot light-emitting diodes (QD-LEDs) are one of the future emissive displays, but understanding charge transport mechanism at the interface and improving charge balances in the device are key challenges to the commercialization of QD-LED. In this study, the ZnO interlayer is introduced by atomic layer deposition (ALD) technique to enhance the performance and lifetime of green-emitting CdZnSeS/ZnS core/shell QD-LEDs. Atomic force microscopy images of QD layer reveal that the thin film of ZnO deposited by ALD reduces the root-mean-square (RMS) roughness of the QD film to less than 2 nm, even though the average diameter of the individual QDs is about 10.9 nm, which results in the suppression of excess electron transport in QD-LED devices. The enhanced performance (an improvement of maximum luminescence from 70 000 to 160 000 cd m(-2)) and operational stability (an improvement of operation lifetime from 20 to 61.5 h at 5000 cd m(-2)) of the QD-LEDs result from the formation of the smoother interface between the QD and electron transport layers, which is indicated by deposition of thicker ALD ZnO or deposition of ALD ZnO after coating the ZnO nanoparticles as an electron transport layer.
URI
https://onlinelibrary.wiley.com/doi/10.1002/admi.202000343https://repository.hanyang.ac.kr/handle/20.500.11754/166238
ISSN
2196-7350
DOI
10.1002/admi.202000343
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE