Femtosecond pulse ablation assisted mg-zno nanoparticles for uv-only emission

Anubhab Sahoo, Muralidhar Miryala, Tejendra Dixit, Alicja Klimkowicz, Bellarmine Francis, Masato Murakami, Mamidanna Sri Ramachandra Rao, Sivarama Krishnan

Research output: Contribution to journalArticle

Abstract

The need for improved UV emitting luminescent materials underscored by applications in optical communications, sterilization and medical technologies is often addressed by wide bandgap semiconducting oxides. Among these, the Mg-doped ZnO system is of particular interest as it offers the opportunity to tune the UV emission by engineering its bandgap via doping control. However, both the doped system and its pristine congener, ZnO, suffer from being highly prone to parasitic defect level emissions, compromising their efficiency as light emitters in the ultraviolet region. Here, employing the process of femtosecond pulsed laser ablation in a liquid (fs-PLAL), we demonstrate the systematic control of enhanced UV-only emission in Mg-doped ZnO nanoparticles using both photoluminescence and cathodoluminescence spectroscopies. The ratio of luminescence intensities corresponding to near band edge emission to defect level emission was found to be six-times higher in Mg-doped ZnO nanoparticles as compared to pristine ZnO. Insights from UV-visible absorption and Raman analysis also reaffirm this defect suppression. This work provides a simple and effective single-step methodology to achieve UV-emission and mitigation of defect emissions in the Mg-doped ZnO system. This is a significant step forward in its deployment for UV emitting optoelectronic devices.

Original languageEnglish
Article number1326
Pages (from-to)1-11
Number of pages11
JournalNanomaterials
Volume10
Issue number7
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Cathodoluminescence
  • Femtosecond ablation
  • Mg-doped ZnO
  • Nanoparticles synthesis
  • UV-emission

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Femtosecond pulse ablation assisted mg-zno nanoparticles for uv-only emission'. Together they form a unique fingerprint.

  • Cite this

    Sahoo, A., Miryala, M., Dixit, T., Klimkowicz, A., Francis, B., Murakami, M., Rao, M. S. R., & Krishnan, S. (2020). Femtosecond pulse ablation assisted mg-zno nanoparticles for uv-only emission. Nanomaterials, 10(7), 1-11. [1326]. https://doi.org/10.3390/nano10071326