Rare earth activated yttrium aluminate phosphors with modulated luminescence

L. E. Muresan, E. J. Popovici, I. Perhaita, E. Indrea, J. Oro, N. Casan Pastor

    Research output: Contribution to journalArticleResearchpeer-review

    5 Citations (Scopus)

    Abstract

    Copyright © 2015 John Wiley & Sons, Ltd. Yttrium aluminate (Y3A5O12) was doped with different rare earth ions (i.e. Gd3+, Ce3+, Eu3+ and/or Tb3+) in order to obtain phosphors (YAG:RE) with general formula,Y3-x-aGdxREaAl5O12 (x = 0; 1.485; 2.97 and a = 0.03). The synthesis of the phosphor samples was done using the simultaneous addition of reagents technique. This study reveals new aspects regarding the influence of different activator ions on the morpho-structural and luminescent characteristics of garnet type phosphor. All YAG:RE phosphors are well crystallized powders containing a cubic-Y3Al5O12 phase as major component along with monoclinic-Y4Al2O9 and orthorhombic-YAlO3 phases as the impurity. The crystallites dimensions of YAG:RE phosphors vary between 38 nm and 88 nm, while the unit cell slowly increase as the ionic radius of the activator increases. Under UV excitation, YAG:Ce exhibits yellow emission due to electron transition in Ce3+ from the 5d level to the ground state levels (2F5/2, 2F7/2). The emission intensity of Ce3+ is enhanced in the presence of the Tb3+ ions and is decreased in the presence of Eu3+ ions due to some radiative or non-radiative processes that take place between activator ions. By varying the rare earth ions, the emission colour can be modulated from green to white and red.
    Original languageEnglish
    Pages (from-to)929-936
    JournalLuminescence
    Volume31
    Issue number4
    DOIs
    Publication statusPublished - 1 Jun 2016

    Keywords

    • luminescence
    • phosphors
    • rare earth
    • wet chemical synthesis
    • yttrium aluminium garnet

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