Calcination-free micropatterning of upconversion luminescent layers consisting of rare-earth-doped ceramic nanoparticles on wettability-patterned flexible plastic sheets by soft-liquid phase adsorption

Satoshi Watanabe, Yoshinori Ishii, Kohei Soga, Mutsuyoshi Matsumoto

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We demonstrate a soft liquid-phase adsorption technique for the fabrication of upconversion luminescent layers consisting of rare-earth-doped ceramic nanoparticle films on wettability-patterned flexible plastic sheets. Visible upconversion luminescence and near-infrared fluorescence were observed under excitation at 980 nm in the Ho3+- and Yb3+-codoped-NaYF4 nanoparticles prepared by hydrothermal technique. Wettability-patterned substrates partly covered with self-assembled monolayers of silane-coupling agents were immersed in methanol/hexane emulsions prepared with water-containing methanol dispersion of the Ho3+- and Yb3+-codoped-NaYF4 nanoparticles. The Ho3+- and Yb3+-codoped-NaYF4 nanoparticle films were formed selectively on the hydrophilic regions of the wettability-patterned templates by adjusting the fabrication conditions of the concentration of the Ho3+- and Yb3+-codoped-NaYF4 nanoparticles, the mixing ratio of methanol to hexane, the immersion temperature, and the immersion time. Upconversion luminescence and fluorescence microscopy showed green, red and near-infrared luminescence on the Ho3+- and Yb3+-codoped-NaYF4 nanoparticle films on the wettability-patterned templates. These results demonstrate that the soft liquid-phase adsorption technique enables the fabrication of upconversion luminescent layers on flexible and non-flexible substrates with minimized material consumption.

Original languageEnglish
Pages (from-to)210-219
Number of pages10
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume506
DOIs
Publication statusPublished - 5 Oct 2016

Keywords

  • Flexible device
  • Near-infrared light
  • Rare-earth-doped ceramic nanoparticle
  • Soft-liquid phase adsorption
  • Upconversion luminescence

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