Eu-doped SrAl2O4 is a promising thermoluminescent and mechanoluminescent material with high brightness and stability, making it suitable for various luminescent devices. In this study, SrAl2O4:Eu was synthesized using a solid-state reaction method, and the effects of reducing atmosphere and high-temperature synthesis conditions on its luminescence properties were systematically analyzed. The luminescence characteristics of SrAl2O4:Eu were found to be highly sensitive to synthesis temperature, atmosphere, and Eu doping concentration, and optimal conditions were determined. A comparison of SrAl2O4:Eu synthesized at 1,300 °C under air and reducing atmospheres revealed that the reducing atmosphere plays a critical role in stabilizing Eu2+ ions, forming a single-phase SrAl2O4, and establishing luminescence centers. Notably, SrAl2O4:Eu synthesized at 1,600 °C in a reducing atmosphere achieved a photoluminescence quantum yield (PLQY) of 43 % and a maximum luminance of 2,030 Cd/m2, showing significant improvement in luminescence efficiency compared to samples synthesized at 1,300 °C. When Eu doping concentrations were adjusted from 1 % to 20 %, the highest luminescence performance was observed at 10 % doping, while excessive doping (20 %) increased non-radiative recombination pathways, and no further improvement in luminescence efficiency was observed. X-ray Diffraction (XRD) and Photoluminescence (PL) analyses elucidated the effects of synthesis conditions on the structural stability and luminescence properties of SrAl2O4:Eu, and the optimal reducing atmosphere and high-temperature synthesis conditions are proposed. This study provides a synthesis strategy for enhancing the luminescence properties of Eu-doped SrAl2O4 and lays the groundwork for the development of highperformance thermoluminescent and mechanoluminescent materials.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
    3.1. SrAl2O4 합성에서 환원 분위기의 중요성
    3.2. Eu 도핑된 SrAl2O4 합성 조건의 최적화
4. 결 론
Acknowledgement
References
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• 최영승(한국과학기술원 신소재공학과) | Youngseung Choi (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea)
• 김채연(한국과학기술원 신소재공학과) | Chaeyoun Kim (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea)
• 박성주(한국과학기술원 신소재공학과) | Seongju Park (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea)
• 박진우(한국과학기술원 신소재공학과) | Jinu Park (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea)
• 신병하(한국과학기술원 신소재공학과) | Byungha Shin (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea) Corresponding author
• 양성진((주)풍산방산기술연구원) | Sung-Jin Yang (Poongsan Defense R&D Institute, Gyeongju 38026, Republic of Korea)
• 고지성((주)풍산방산기술연구원) | Ji-Seong Go (Poongsan Defense R&D Institute, Gyeongju 38026, Republic of Korea)