Preparation and characterization of Y2O3

Bi3+,Yb3+ nanosheets with wavelength conversion from near-ultraviolet to near-infrared

Keisuke Fujita, Ryoma Watanabe, Yoshiki Iso, Tetsuhiko Isobe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Y2O3:Bi3+,Yb3+ nanophosphors, which exhibit near-infrared (NIR) emission under near-ultraviolet (near-UV) excitation, are promising candidates for spectral converters in crystalline silicon solar devices. Herein, Y2O3:Bi3+,Yb3+ nanosheets were prepared by calcination of hydrothermally-synthesized precursors. The effects of the calcination temperature on their properties were investigated. The nanosheets calcined at ≤ 800 °C had sheet-like, square morphologies with average lateral sizes of 210–240 nm, which were smaller than precursor nanosheet with 257 nm attributed to shrinkage through the calcination. The thickness of the nanosheet before and after calcination at 800 °C was ~20 nm. Moreover, the nanosheet had a single-crystal nature. However, at calcination temperatures ≥ 900 °C, the nanosheets lost their morphologies, and transformed into irregular particles. The Y2O3:Bi3+,Yb3+ nanosheets showed visible emission from Bi3+ and NIR emission from Yb3+ under near-UV excitation. The PL intensity and PL decay time of the NIR emission monotonically increased with increasing calcination temperature. Both increases can be explained by the following effects: (i) removal of H2O molecules adsorbed on the nanosheet surface, (ii) improvement of crystallinity and decrease of specific surface area, (iii) increase in probability of energy transfer from Bi3+ to Yb3+, and (iv) oxidation of reduced bismuth during calcination. Furthermore, the photostability of the nanosheets under near-UV excitation was improved by increasing calcination temperature.

Original languageEnglish
Pages (from-to)243-250
Number of pages8
JournalJournal of Luminescence
Volume198
DOIs
Publication statusPublished - 2018 Jun 1

Fingerprint

Optical frequency conversion
Nanosheets
roasting
Calcination
Infrared radiation
preparation
Temperature
wavelengths
Bismuth
Energy Transfer
Silicon
excitation
Equipment and Supplies
temperature
shrinkage
bismuth
converters
Specific surface area
crystallinity
Energy transfer

Keywords

  • Crystalline silicon solar device
  • Down-conversion
  • Nanosheet
  • Photoluminescence
  • Spectral converter
  • YO:Bi,Yb

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

Cite this

Preparation and characterization of Y2O3 : Bi3+,Yb3+ nanosheets with wavelength conversion from near-ultraviolet to near-infrared. / Fujita, Keisuke; Watanabe, Ryoma; Iso, Yoshiki; Isobe, Tetsuhiko.

In: Journal of Luminescence, Vol. 198, 01.06.2018, p. 243-250.

Research output: Contribution to journalArticle

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abstract = "Y2O3:Bi3+,Yb3+ nanophosphors, which exhibit near-infrared (NIR) emission under near-ultraviolet (near-UV) excitation, are promising candidates for spectral converters in crystalline silicon solar devices. Herein, Y2O3:Bi3+,Yb3+ nanosheets were prepared by calcination of hydrothermally-synthesized precursors. The effects of the calcination temperature on their properties were investigated. The nanosheets calcined at ≤ 800 °C had sheet-like, square morphologies with average lateral sizes of 210–240 nm, which were smaller than precursor nanosheet with 257 nm attributed to shrinkage through the calcination. The thickness of the nanosheet before and after calcination at 800 °C was ~20 nm. Moreover, the nanosheet had a single-crystal nature. However, at calcination temperatures ≥ 900 °C, the nanosheets lost their morphologies, and transformed into irregular particles. The Y2O3:Bi3+,Yb3+ nanosheets showed visible emission from Bi3+ and NIR emission from Yb3+ under near-UV excitation. The PL intensity and PL decay time of the NIR emission monotonically increased with increasing calcination temperature. Both increases can be explained by the following effects: (i) removal of H2O molecules adsorbed on the nanosheet surface, (ii) improvement of crystallinity and decrease of specific surface area, (iii) increase in probability of energy transfer from Bi3+ to Yb3+, and (iv) oxidation of reduced bismuth during calcination. Furthermore, the photostability of the nanosheets under near-UV excitation was improved by increasing calcination temperature.",
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