Centimeter-Scale and Visible Wavelength Monolayer Light-Emitting Devices

Joy Cho, Matin Amani, Der-Hsien Lien, Hyungjin Kim, Matthew Yeh, Vivian Wang, Chaoliang Tan, Ali Javey*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Monolayer 2D transition metal dichalcogenides (TMDCs) have shown great promise for optoelectronic applications due to their direct bandgaps and unique physical properties. In particular, they can possess photoluminescence quantum yields (PL QY) approaching unity at the ultimate thickness limit, making their application in light-emitting devices highly promising. Here, large-area WS2 grown via chemical vapor deposition is synthesized and characterized for visible (red) light-emitting devices. Detail optical characterization of the synthesized films is performed, which show peak PL QY as high as 12%. Electrically pumped emission from the synthetic WS2 is achieved utilizing a transient-mode electroluminescence device structure, which consists of a single metal–semiconductor contact and alternating gate fields to achieve bipolar emission. Utilizing this aforementioned structure, a centimeter-scale (≈0.5 cm2) visible (640 nm) display is demonstrated, fabricated using TMDCs to showcase the potential of this material system for display applications.

Original languageEnglish
Article number1907941
Number of pages6
JournalAdvanced Functional Materials
Volume30
Issue number6
DOIs
StatePublished - Feb 2020

Keywords

  • chemical vapor deposition
  • electroluminescence
  • monolayer display
  • transition metal dichalcogenide
  • visible emission
  • WS2
  • DIODES
  • PHOTOLUMINESCENCE

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