The long Afterglow and Thermoluminescence Properties of MAl2O4 Eu2+, Dy3+(M=Ca, Sr and Ba) Phosphors Syntheized by Combustion Technique
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.
Huaiying Zhou, Tianlong Gu, Daoguo Yang, Zhengyi Jiang, Jianmin Zeng
W. Xie et al., "The long Afterglow and Thermoluminescence Properties of MAl2O4 Eu2+, Dy3+(M=Ca, Sr and Ba) Phosphors Syntheized by Combustion Technique", Advanced Materials Research, Vols. 197-198, pp. 318-322, 2011