High-resolution electroluminescent imaging of pressure distribution using a piezoelectric nanowire LED array

Caofeng Pan, Lin Dong, Guang Zhu, Simiao Niu, Ruomeng Yu, Qing Yang, Ying Liu, Zhong Lin Wang

Research output: Journal PublicationArticlepeer-review

548 Citations (Scopus)

Abstract

Emulation of the sensation of touch through high-resolution electronic means could become important in future generations of robotics and human-machine interfaces. Here, we demonstrate that a nanowire light-emitting diode-based pressure sensor array can map two-dimensional distributions of strain with an unprecedented spatial resolution of 2.7 μm, corresponding to a pixel density of 6,350 dpi. Each pixel is composed of a single n-ZnO nanowire/p-GaN light-emitting diode, the emission intensity of which depends on the local strain owing to the piezo-phototronic effect. A pressure map can be created by reading out, in parallel, the electroluminescent signal from all of the pixels with a time resolution of 90 ms. The device may represent a major step towards the digital imaging of mechanical signals by optical means, with potential applications in artificial skin, touchpad technology, personalized signatures, bio-imaging and optical microelectromechanical systems.

Original languageEnglish
Pages (from-to)752-758
Number of pages7
JournalNature Photonics
Volume7
Issue number9
DOIs
Publication statusPublished - Sep 2013
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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