Microwave-employed sol–gel synthesis of scheelite-type microcrystalline aggd(Moo4)2:Yb3+/ho3+ upconversion yellow phosphors and their spectroscopic properties

Chang Sung Lim, Aleksandr Aleksandrovsky, Victor Atuchin, Maxim Molokeev, Aleksandr Oreshonkov

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Abstract

AgGd(MoO4)2:Ho3+/Yb3+ double molybdates with five concentrations of Ho3+ and Yb3+ were synthesized by the microwave employed sol–gel based process (MES), and the crystal structure variation, concentration effects, and spectroscopic characteristics were investigated. The crystal structures of AgGd1-x-yHoxYby(MoO4)2 (x = 0, 0.05; y = 0, 0.35, 0.4, 0.45, 0.5)at room temperature were determined in space group I41 /a by Rietveld analysis. Pure AgGd(MoO4)2 has a scheelite-type structure with mixed occupations of (Ag,Gd) sites and cell parameters a = 5.24782 (11) and c = 11.5107 (3) Å, V = 317.002 (17) Å3, Z = 4. In doped samples, the sites are occupied by a mixture of (Ag,Gd,Ho,Yb) ions, which provides a linear cell volume decrease with the doping level increase. Under the excitation at 980 nm, AGM:0.05Ho,yYb phosphors exhibited a yellowish green emission composed of red and green emission bands according to the strong transitions5F55I8 and5S2/5F45I8 of Ho3+ ions. The evaluated photoluminescence and Raman spectroscopic results were discussed in detail. The upconversion intensity behavior dependent on the Yb/Ho ratio is explained in terms of the optimal number of Yb3+ ions at the characteristic energy transfer distance around the Ho3+ ion.

Original languageEnglish
Article number1000
Pages (from-to)1-14
Number of pages14
JournalCrystals
Volume10
Issue number11
DOIs
Publication statusPublished - Nov 2020

Keywords

  • Double molybdate
  • Microwave sol–gel
  • Spectroscopic properties
  • Upconversion
  • Yellow phosphors
  • double molybdate
  • CE
  • FUNDAMENTALS
  • yellow phosphors
  • X-RAY-DIFFRACTION
  • LUMINESCENCE PROPERTIES
  • CRYSTAL-STRUCTURES
  • spectroscopic properties
  • gel
  • microwave sol&#8211
  • PHOTOLUMINESCENCE PROPERTIES
  • MODULATED STRUCTURE
  • GROWTH
  • CHEMISTRY
  • upconversion
  • RARE-EARTH MOLYBDATES

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