| 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 |
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| ABSTRACT |
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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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