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J. Korean Ceram. Soc. > Volume 51(6); 2014 > Article
Journal of the Korean Ceramic Society 2014;51(6): 618.
doi: https://doi.org/10.4191/kcers.2014.51.6.618
SrAl2O4: Eu2+, Dy3+ 축광안료의 고온안정성에 관한 연구
김진호, 이승용, 김태호, 한규성, 황광택, 조우석
한국세라믹기술원 이천분원
Thermal Stability of SrAl2O4: Eu2+, Dy3+ with Long Afterglow Phosphorescence
Jin-Ho Kim, Seung-Yong Lee, Tae-Ho Kim, Kyu-Sung Han, Kwang-Taek Hwang, Woo-Seok Cho
Icheon Branch, Korea Institute of Ceramic Engineering and Technology
Oxide phosphorescent phosphor has an wide application in ceramic art and decoration due to its chemical and mechanical properties. Here, phosphorescent properties of strontium aluminate phosphor ($SrAl_2O_4:Eu^{2+}$, $Dy^{3+}$) emitting yellowish-green light was investigated with thermal treatment at $1250^{circ}C$ under air and reducing atmosphere. The characterizations of thermally treated samples were analyzed using X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), fluorescence spectrometer. $SrAl_2O_4:Eu^{2+}$, $Dy^{3+}$ still showed a good phosphorescent properties after annealing process in reducing atmosphere, while phosphorescence of $SrAl_2O_4:Eu^{2+}$, $Dy^{3+}$ annealed in air seriously degraded, due to oxidation of $Eu^{2+}$ to $Eu^{3+}$ ions. It was also observed that $SrAl_2O_4:Eu^{2+}$, $Dy^{3+}$ annealed in reducing atmosphere emitted yellowish-green light during 3 h after being exposed to sunlight.
Key words: Phosphorescent phosphor, $SrAl_2O_4:Eu^{2+}$, $Dy^{3+}$, Reducing atmosphere, Heat treatment, Afterglow
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