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image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Journal of Materials...arrow_drop_down
image/svg+xml Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao Closed Access logo, derived from PLoS Open Access logo. This version with transparent background. http://commons.wikimedia.org/wiki/File:Closed_Access_logo_transparent.svg Jakob Voss, based on art designer at PLoS, modified by Wikipedia users Nina and Beao
Journal of Materials Chemistry C
Article . 2019 . Peer-reviewed
License: Royal Society of Chemistry Licence to Publish
Data sources: Crossref
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Preparation of efficient quantum dot light-emitting diodes by balancing charge injection and sensitizing emitting layer with phosphorescent dye

Authors: Luhua Lan; Benchang Liu; Hong Tao; Jianhua Zou; Congbiao Jiang; Miao Xu; Lei Wang; +2 Authors

Preparation of efficient quantum dot light-emitting diodes by balancing charge injection and sensitizing emitting layer with phosphorescent dye

Abstract

The balance between electron and hole injection is critical for obtaining high efficiency in quantum dot light-emitting diodes (QLEDs). Herein, 1,4-dioxane was employed as a solvent for poly(9-vinylcarbazole) (PVK) in stepwise co-HTL (HTL: hole transport layer)-based red QLEDs with poly[bis(4-phenyl)(4-butylphenyl)amine] (poly-TPD)/PVK, enabling a 41.5% enhancement in external quantum efficiency (EQE) compared to that of the control device without a PVK layer. Based on the high-performance co-HTL device, the blue phosphorescence dye bis[2-(4,6-difluorophenyl)pyridinato-C2,N](picolinato)iridium(III) (FIrpic) was incorporated into PVK for further improving the device efficiency. Consequently, at a blend ratio of 10 : 2 in volume, the co-HTL QLED with a mixed PVK : FIrpic layer showed the highest maximum current efficiency (CEmax) of 18.2 cd A−1 and EQEmax of 12.2%, which was 30% and 28.4% higher than that of the co-HTL device without the FIrpic mixture, respectively. Compared to the control device with only poly-TPD as the HTL, the luminous efficiency nearly doubled. The substantial performance improvements are mainly attributed to the stepwise energy level alignment of the HTLs, uniform morphology of the PVK:FIrpic films obtained from the orthogonal solvent 1,4-dioxane, and efficient nonradiative energy transfer (NRET) from PVK : FIrpic (10 : 2) to the QDs. Thus, this study offers a new practical method to promote the performance of QLEDs and eventually their commercial use in display and lighting applications.

Related Organizations
Subjects by Vocabulary

Microsoft Academic Graph classification: Materials science chemistry.chemical_element law.invention law Iridium Diode business.industry chemistry Quantum dot Optoelectronics Quantum efficiency Luminous efficacy business Phosphorescence Layer (electronics) Light-emitting diode

Keywords

Materials Chemistry, General Chemistry

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    29
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Average
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
29
Top 10%
Average
Top 10%