The long Afterglow and Thermoluminescence Properties of MAl₂O₄ Eu²⁺, Dy³⁺(M=Ca, Sr and Ba) Phosphors Syntheized by Combustion Technique

Abstract:

MAl₂O₄:Eu²⁺0.01, Dy³⁺0.02 (M=Ca, Sr and Ba) materials were synthesized by combustion method. X-ray powder diffraction (XRD) patterns indicate that all the samples are of high purity and crystallinity. The grain sizes of MAl₂O₄:Eu²⁺, Dy³⁺ are similar. The luminescent properties of phosphors were studied systematically. The main peaks of emission spectra of the luminescent phosphors changes from blue-purple to yellow-green and then to blue-green due to the different distortion existed in different host lattices. The decay time of phosphors varies a lot, and SrAl₂O₄:Eu²⁺, Dy³⁺ shows the best persistence characteristic. Thermoluminescence analysis indicates that the trap levels in MAl₂O₄:Eu²⁺, Dy³⁺ (M=Ca, Sr and Ba) are different, and the trap level in SrAl₂O₄ host is the most moderate to exhibit long afterglow at room temperature.

• Periodical: Advanced Materials Research (Volumes 197-198)
• Pages: 318-322
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.197-198.318
• Online since: February 2011
• Authors: Wei Xie, Le Xi Shao, Yin Hai Wang, Jun Zhang, Chang Wei Zou
• Keywords: Afterglow, Aluminate, Thermoluminescence (TL), Trap

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