Solution-Processable MoOx for Efficient Light-Emitting Diodes Based on Giant Quantum Dots

Hoang Tuan Vu, Yan Kuin Su*, Ray Kuang Chiang, Chun Yuan Huang, Chih Jung Chen, Hsin-Chieh Yu

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We report efficient quantum dot light-emitting diodes (QLEDs) using sizable 13-nm green-emission quantum dots as the emissive layer and solution-processable MoOx as the hole injection layer (HIL). The MoOx HIL was prepared by the decomposition of a solution of ammonium molybdate tetrahydrate at 80 °C under ambient conditions, further spin-coated onto an indium tin oxide substrate to facilitate hole injection. Compared with the reference sample with a polymeric hole injection material poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), the sMoOx film showed a higher work function of 5.6 eV, better transparency, and smoother surface morphology. The stable QLED with optimized MoOx film thickness achieved a higher maximum current efficiency of 10.8 cd/A at a lower turn-on voltage of 2.2 V versus the one with a PEDOT:PSS HIL, 9.9 cd/A and 2.9 V, respectively. Moreover, a small leakage current in sMoOx-device was found, which was attributed to the better surface morphology of sMoOx.

Original languageEnglish
Article number7486960
Pages (from-to)2156-2159
Number of pages4
JournalIEEE Photonics Technology Letters
Volume28
Issue number20
DOIs
StatePublished - 15 Oct 2016

Keywords

  • MoOx
  • Quantum dots (QDs)
  • giant QDs
  • molybdenum oxides
  • quantum dot light-emitting diodes (QLED)

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