A generic electroluminescent device for emission from infrared to ultraviolet wavelengths

Yingbo Zhao, Vivian Wang, Der Hsien Lien, Ali Javey*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The range of luminescent materials that can be used in electroluminescent devices is limited due to material processing challenges and band alignment issues. This impedes the development of electroluminescent devices at extreme wavelengths and hinders the use of electroluminescence spectroscopy as an analytical technique. Here, we show that a two-terminal device that uses an array of carbon nanotubes as the source contact can excite electroluminescence from various materials independent of their chemical composition. Transient band bending, created by applying an a.c. gate voltage, is used to achieve charge injection across different band alignments. As a result, the device can produce electroluminescence from long-wave infrared (0.13 eV) to ultraviolet (3.3 eV) wavelengths depending on the emitting material drop-casted on top of the nanotube array, and with onset voltages approaching the optical energy gap of the emitting material. We show that our device can be used to probe a chemical reaction in a liquid droplet via electroluminescence spectroscopy and can be used as an electroluminescence sensor for detecting organic vapours.

Original languageEnglish
Pages (from-to)612-621
Number of pages10
JournalNature Electronics
Volume3
Issue number10
DOIs
StatePublished - 1 Oct 2020

Fingerprint

Dive into the research topics of 'A generic electroluminescent device for emission from infrared to ultraviolet wavelengths'. Together they form a unique fingerprint.

Cite this