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Achieving high efficiency by improving hole injection into quantum dots in colloidal quantum dot light-emitting devices with organic electron transport layer.

Authors :
Park, Da-Young
Lim, Jae-Hoon
Kim, Seong-Geun
Kang, Ji-Ho
Choi, Seung-Jeong
Moon, Dae-Gyu
Source :
Molecular Crystals & Liquid Crystals. 2022, Vol. 735 Issue 1, p44-50. 7p.
Publication Year :
2022

Abstract

We developed highly efficient quantum dot light-emitting devices (QD-LEDs) by improving the charge balance with triple hole injection and transport layers consisted of MoO3/poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine] (poly-TPD)/poly(9-vinylcarbazole) (PVK). The hole injection layer was prepared by evaporating MoO3. Poly-TPD and PVK were spin-coated as hole transport layers. The stepwise energy level of MoO3/poly-TPD/PVK enhanced the hole injection from anode to QD emitters. Tris[2,4,6-trimethyl-3-(pyridine-3-yl)phenyl]borane (3TPYMB) was used as an electron transport layer (ETL) because of its relatively high electron mobility and deep lowest unoccupied molecular orbital (LUMO) level. We achieved high external quantum efficiency of 8.2% by enhancing hole injection into the QD layer in the organic ETL-based green QD-LEDs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15421406
Volume :
735
Issue :
1
Database :
Academic Search Index
Journal :
Molecular Crystals & Liquid Crystals
Publication Type :
Academic Journal
Accession number :
158065955
Full Text :
https://doi.org/10.1080/15421406.2021.1972227