Combustion synthesis of long-persistent luminescent MAl2O4: Eu2+, R3+ (M = Sr, Ba, Ca, R = Dy, Nd and La) nanoparticles and luminescence mechanism research

Eu2+, R3+ co-doped alkaline earth aluminates MAl2O4: Eu2+, R3+ (M=Sr, Ba and Ca; R=Dy, Nd and La) nanoparticles with high brightness and long afterglow have been prepared by solution-combustion synthesis at 600 deg C without a post-annealing process for the first time. The morphologies and the phase...

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Veröffentlicht in:Acta materialia 2007-05, Vol.55 (8), p.2615-2620
Hauptverfasser: Qiu, Zifeng, Zhou, Yuanyuan, Lü, Mengkai, Zhang, Aiyu, Ma, Qian
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Sprache:eng
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Zusammenfassung:Eu2+, R3+ co-doped alkaline earth aluminates MAl2O4: Eu2+, R3+ (M=Sr, Ba and Ca; R=Dy, Nd and La) nanoparticles with high brightness and long afterglow have been prepared by solution-combustion synthesis at 600 deg C without a post-annealing process for the first time. The morphologies and the phase structures of the products have been characterized by transmission electron microscopy and X-ray diffraction. The excitation and emission spectra of the products have been measured by an Edinburgh FLS920 spectrometer at room temperature. The characteristic luminescence of the as-prepared sample has been evaluated, and the reason why the wavelength changed from yellow-green to blue-green and then to blue-purple in visible range when the composition changed from SrAl2O4: Eu2+, Dy3+ to BaAl2O4: Eu2+, Nd3+ and then to CaAl2O4: Eu2+, La3+ has been explained. Furthermore, a new persistent luminescence mechanism was proposed in this article.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2006.12.018