Luminescent Properties, Afterglow Behavior and Thermoluminescence Characteristics of (Eu, Dy) Doped Sr₃Al₂O₆ Phosphors

Abstract:

(Eu, Dy) doped Sr3Al2O6 phosphors with high brightness and long afterglow were achieved by a high-temperature solid state reaction. Luminescence measurements indicate that the phosphor Sr3Al2O6:Eu prepared in normal atmosphere exhibits a sharp orange emission peaking at 591 nm excited by 221nm light, which is intrinsic f-f transition generated from Eu3+. Whereas, the phosphors Sr3Al2O6:Eu and Sr3Al2O6:Eu,Dy prepared in a weak reducing atmosphere show both a sharp orange emission peaking at 591nm excited by 221-nm light and a broad green emission peaking at 510nm excited by 328nm light, which resulted from Eu2+ transition between 4f65d1 and 4f7 electron configurations. The investigation results suggest that Eu3+ and Eu2+ co-exist in Sr3Al2O6 matrix synthesized in weak reducing atmosphere. In all samples, only Sr3Al2O6: Eu, Dy prepared in a weak reducing atmosphere has high intensity afterglow after excited by the UV source. The decay curve of Sr3Al2O6: Eu, Dy phosphor contains the rapid-decaying process and the slow-decaying process and can be fitted by a bi-exponential decay function. The measurement of thermal simulated luminescence demonstrates that only appropriate deep trap energy level and high trap concentration can generate optimum long-afterglow performance.

• Periodical: Applied Mechanics and Materials (Volumes 152-154)
• Pages: 198-203
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.152-154.198
• Online since: January 2012
• Authors: Ya Li, Yin Hai Wang, Yi Xiong, Tie Qiu Peng, Mao Song Mo
• Keywords: Afterglow, Phosphor, Thermoluminescence (TL), Trap Energy Level

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