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Observation and Suppression of Stacking Interface States in Sandwich-Structured Quantum Dot Light-Emitting Diodes
Dong, Jia Yi1; Ng, Kar Wei1; Song, Yin Man1; Li, Jie Lei1; Kong, You Chao1; Wang, Meng Wei1; Xu, Jin Cheng1; Li, Lin2; Chen, Shi1; Tang, Zi Kang1; Wang, Shuang Peng1
2021-12-01
Source PublicationACS Applied Materials and Interfaces
ISSN1944-8244
Volume13Issue:47Pages:56630-56637
Abstract

Interfacial quality of functional layers plays an important role in the carrier transport of sandwich-structured devices. Although the suppression of interface states is crucial to the overall device performance, our understanding on their formation and annihilation mechanism via direct characterization is still quite limited. Here, we present a thorough study on the interface states present in the electron transport layer (ETL) of blue quantum dot (QD) light-emitting diodes (QLEDs). A ZnO/ZnMgO bilayer ETL is adopted to enhance the electron injection into blue QDs. By probing the ETL band structure with photoelectron spectroscopy, we discover that substantial band bending exists at the ZnO/ZnMgO interface, elucidating the presence of a high density of interface states which hinder electron transport. By inserting a ZnO@ZMO interlayer composed of mixed ZnO and ZnMgO nanoparticles, the band bending and thus the interface states are observed to reduce significantly. We attribute this to the hybrid surface properties of ZnO@ZMO, which can annihilate the surface states of both the ZnO and ZnMgO layers. The introduction of a bridging layer has led to ∼40% enhancement in the power efficiency of blue QLEDs and noticeable performance boosts in green and red QLEDs. The findings here demonstrate a direct observation of interface states via detailed band structure studies and outline a potential pathway for eliminating these states for better performances in sandwich-structured devices.

KeywordElectron Injection Electron Transport Layer Interface States Quantum Dot Light-emitting Diodes Sandwich Structure
DOI10.1021/acsami.1c13052
URLView the original
Language英語English
Scopus ID2-s2.0-85119955211
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Document TypeJournal article
CollectionINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Affiliation1.Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, 999078, Macao
2.Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electron Engineering, Harbin Normal University, Harbin, 150025, China
First Author AffilicationINSTITUTE OF APPLIED PHYSICS AND MATERIALS ENGINEERING
Recommended Citation
GB/T 7714
Dong, Jia Yi,Ng, Kar Wei,Song, Yin Man,et al. Observation and Suppression of Stacking Interface States in Sandwich-Structured Quantum Dot Light-Emitting Diodes[J]. ACS Applied Materials and Interfaces,2021,13(47):56630-56637.
APA Dong, Jia Yi,Ng, Kar Wei,Song, Yin Man,Li, Jie Lei,Kong, You Chao,Wang, Meng Wei,Xu, Jin Cheng,Li, Lin,Chen, Shi,Tang, Zi Kang,&Wang, Shuang Peng.(2021).Observation and Suppression of Stacking Interface States in Sandwich-Structured Quantum Dot Light-Emitting Diodes.ACS Applied Materials and Interfaces,13(47),56630-56637.
MLA Dong, Jia Yi,et al."Observation and Suppression of Stacking Interface States in Sandwich-Structured Quantum Dot Light-Emitting Diodes".ACS Applied Materials and Interfaces 13.47(2021):56630-56637.
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