Controlling charge balance using non-conjugated polymer interlayer in quantum dot light-emitting diodes

Jinyoung Yun, Jaeyun Kim, Ho Kyun Jang, Kook Jin Lee, Jung Hwa Seo, Byung Jun Jung, Gyu-Tae Kim, Jeonghun Kwak

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The balance of electron–hole charge carriers in quantum dot (QD) light-emitting diodes (QLEDs) is an important factor to achieve high efficiency. However, poor interfacial properties between QDs and their adjacent layers are likely to deteriorate the electron–hole charge balance, resulting in the poor performance of a QLED. In this paper, we report an enhanced efficiency in red-emitting inverted QLEDs by modifying the interface properties between QDs and ZnO electron transport layer (ETL) using a thin layer of non-conjugated polymer, poly(4-vinylpyridine) (PVPy). Based on the precise control of the electrical properties with PVPy, the maximum efficiency of the QLED is enhanced by 30% compared to the device without a PVPy layer. In particular, the efficiency at low current density region is significantly increased. We investigate the effect of the PVPy interlayer on the performance of QLEDs and find that this thin layer not only shifts the energy levels of the underlying ZnO ETL, but also effectively blocks the leakage current at the ETL/QD interface.

Original languageEnglish
Pages (from-to)82-86
Number of pages5
JournalOrganic Electronics: physics, materials, applications
Volume50
DOIs
Publication statusPublished - 2017 Nov 1

Fingerprint

Semiconductor quantum dots
Light emitting diodes
interlayers
Polymers
light emitting diodes
quantum dots
polymers
Charge carriers
Leakage currents
Electron energy levels
electrons
Electric properties
Current density
low currents
charge carriers
leakage
energy levels
electrical properties
current density
Electron Transport

Keywords

  • Interlayer
  • Light-emitting diodes
  • poly(4-vinylpyridine) (PVPy)
  • QLEDs
  • Quantum dots

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Controlling charge balance using non-conjugated polymer interlayer in quantum dot light-emitting diodes. / Yun, Jinyoung; Kim, Jaeyun; Jang, Ho Kyun; Lee, Kook Jin; Seo, Jung Hwa; Jung, Byung Jun; Kim, Gyu-Tae; Kwak, Jeonghun.

In: Organic Electronics: physics, materials, applications, Vol. 50, 01.11.2017, p. 82-86.

Research output: Contribution to journalArticle

Yun, Jinyoung ; Kim, Jaeyun ; Jang, Ho Kyun ; Lee, Kook Jin ; Seo, Jung Hwa ; Jung, Byung Jun ; Kim, Gyu-Tae ; Kwak, Jeonghun. / Controlling charge balance using non-conjugated polymer interlayer in quantum dot light-emitting diodes. In: Organic Electronics: physics, materials, applications. 2017 ; Vol. 50. pp. 82-86.
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