This study proposes a Dispersion-Induced Decarburization (DID) process using polar solvents to address the degradation of luminescence efficiency in SrAl2O4:Eu phosphors caused by carbon contamination from carbon crucibles during high-temperature synthesis. Conventional high-temperature oxidation treatments are effective for carbon removal but induce the oxidation of Eu2+ ions and structural collapse of the SrAl2O4 host, resulting in severe degradation of luminescence properties. The proposed DID process physically removes carbon impurities by dispersing SrAl2O4:Eu powders in highly polar solvents such as distilled water (DI), dimethyl sulfoxide (DMSO), N-methyl-2-pyrrolidone (NMP), and N,N-dimethylformamide (DMF). Among them, DI exhibited the highest purification efficiency, completely eliminating carbon-related diffraction peaks. As a result, the photoluminescence quantum yield (PLQY) of SrAl2O4:Eu improved from 32 % to 50 %, and a maximum PLQY of 55.2 % with a luminance of 6,000 cd･m-2 was achieved for the 20 mol% Eu-doped powder. This work presents a novel and effective purification strategy that overcomes carbon contamination in SrAl2O4:Eu phosphors, significantly enhancing their luminescence efficiency without structural damage.

Abstract
1. 서 론
2. 실험 방법
3. 결과 및 고찰
    3.1. 고온 산화 분위기 하 탈탄 과정의 한계점 분석
    3.2. 극성 용매 분산 탈탄 과정 개발
4. 결 론
Acknowledgement
References
<저자소개>

• 김채연(한국과학기술원 신소재공학과) | Chaeyoun Kim (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea)
• 최영승(한국과학기술원 신소재공학과) | Youngseung Choi (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea)
• 박성주(한국과학기술원 신소재공학과) | Seongju Park (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea)
• 박서연(한국과학기술원 신소재공학과) | Seoyeon Park (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea)
• 신병하(한국과학기술원 신소재공학과) | Byungha Shin (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea) Corresponding author
• 양성진(㈜풍산방산기술연구원) | Sung-jin Yang (Poongsan Defense R&D Institute, Gyeongju 38026, Republic of Korea)
• 고지성(㈜풍산방산기술연구원) | Ji-seong Go (Poongsan Defense R&D Institute, Gyeongju 38026, Republic of Korea)