고상반응법과 착체중합법으로 합성된 SrAl2O4: Eu 2+ , Dy 3+ 축광성 형광체의 특성 및 열적 안정성 평가
Characteristics and thermal stability of SrAl2O4: Eu 2+ , Dy 3+ long afterglow phosphors synthesized solid state reaction and polymerized complex method
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초록
고상반응법과 착체중합법 두 합성법에 의해 합성된 SrAl2O4: Eu2+, Dy3+ 축광성 형광체 분말의 특성을 비교 분석하였다. 열적 안정성을 평가하기 위해 산업 도자 제조공정에서 사용되는 열처리 조건(1250oC, 1시간 유지, LPG 환원분위기)을 적용하여 고상반응법과 착체중합법으로 합성된 SrAl2O4: Eu2+, Dy3+ 축광성 형광체 분말의 열처리 전후의 축광 특성변화를 관찰하였다. 두 합성법으로 합성된 분말과 고온 열처리 전후의 분말은 XRD 분석을 통해 결정구조 및 결정자 크기변화를 확인하였고, SEM과 PSA 분석을 이용하여 미세구조 및 입자 크기 변화를 관찰하였다. Spectrofluorometer 분석을 통해 SrAl2O4: Eu2+, Dy3+ 축광성 형광체의 여기 및 발광 특성, 장잔광 특성 변화를 확인하였다.
Abstract
Characteristics of SrAl2O4: Eu2+, Dy3+ phosphorescent phosphors synthesized by solid state reaction and polymerized complex method were comparatively analyzed. In order to evaluate thermal stability of SrAl2O4: Eu2+, Dy3+ phosphorescent phosphors at high temperature, phosphorescent properties of SrAl2O4: Eu2+, Dy3+ were investigated with thermal treatment at 1250oC under reducing atmosphere, which was the general heat treatment conditions for ceramic manufacturing process. The phosphorescent properties of thermally treated SrAl2O4: Eu2+, Dy3+ phosphors synthesized by solid state reaction and polymerized complex method were investigated. The crystal structure and crystallite size were observed through XRD analysis. Microstructure and particle size of thermally treated SrAl2O4: Eu2+, Dy3+ phosphors were analyzed by SEM and PSA. Photoluminescence and afterglow characteristics of thermally treated SrAl2O4: Eu2+, Dy3+ phosphorescent phosphors were measured by spectrofluorometer.
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