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Issue 41, 2014
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Heavily Eu2O3-doped yttria-aluminoborate glasses for red photoconversion with a high quantum yield: luminescence quenching and statistics of cluster formation

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Abstract

We report on the photoluminescence (PL) properties of heavily Eu2O3 doped Y2O3–Al2O3–B2O3 glasses as a high-gain red-emitting material for photoconversion. A UV-to-red conversion efficiency of up to 60% is achieved in this material. Concentration quenching is related to the formation of –{Eu–O–Me–O–Eu}– (Me = B, Y, Al) and –{Eu–O–Eu}– linkages in the first and second coordination shell, respectively, of Eu3+. For a quantitative consideration, we employ a statistical approach to estimate the number of those species as a function of europium concentration. In this way, a crossover composition is obtained at a dopant concentration of ∼3 mol% of Eu2O3 where further addition of europium directly increases the number of –{Eu–O–Eu}–. In the latter species, the critical distance for concentration quenching of PL is achieved so that for concentrations above the crossover, PL quantum efficiency decreases. This observation is confirmed experimentally through lifetime analyses as well as direct measurements of internal quantum efficiency. The proposed tool can now be used to predict and optimize cluster formation and concentration quenching in rare-earth doped glasses.

Graphical abstract: Heavily Eu2O3-doped yttria-aluminoborate glasses for red photoconversion with a high quantum yield: luminescence quenching and statistics of cluster formation

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Publication details

The article was received on 04 Jul 2014, accepted on 20 Aug 2014 and first published on 21 Aug 2014


Article type: Paper
DOI: 10.1039/C4TC01447B
Citation: J. Mater. Chem. C, 2014,2, 8678-8682
  • Open access: Creative Commons BY-NC license
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    Heavily Eu2O3-doped yttria-aluminoborate glasses for red photoconversion with a high quantum yield: luminescence quenching and statistics of cluster formation

    G. Gao, J. Wei, Y. Shen, M. Peng and L. Wondraczek, J. Mater. Chem. C, 2014, 2, 8678
    DOI: 10.1039/C4TC01447B

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