CaAl2O4:Eu2+ 靑色 螢光體의 Nd3+ 도핑 最適化에 관한 硏究
Optimization of Nd3+ ion co-doping in CaAl2O4:Eu2+ blue phosphor
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참고문헌
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초록
Eu2+, Nd3+로 도핑된CaAl2O4 청색 형광체를 고상반응법으로 제조하였다. 1 mol% Eu2+로 doping된 형광체에 다양한 조성의 Nd3+를 co-doping함에 따라 고휘도, 장잔광 특성을 보였다. 제조한 형광체에 대하여 XRD, SEM, TEM, 빛발광 특성을 조사하였다. CaAl2O4:Eu2+:Nd3+의 넓은 밴드의 UV로 여기된 빛발광 특성이 Eu2+의 4f65d1에서 4f7의 상태로 천이에 의해 기인된 청색영역(max=440nm)에서 관찰되었다. Nd3+로 co-doping한 형광체는 여기광을 차단하였을 때 장잔광 발광 특성을 나타내었다.
Abstract
Blue phosphor calcium aluminate, CaAl2O4: Eu2+ co-doped with Nd3+ was prepared by solid state synthesis method. Phosphor materials with 1 mol% Eu2+ and varying compositions of Nd3+ show high brightness and long persistent luminescence. The synthesized phosphor materials were investigated by powder X-ray diffraction (XRD), SEM, TEM, photoluminescence excitation and emission studies. Broad band UV excited luminescence of the CaAl2O4:Eu2+:Nd3+ was observed in the blue region (max= 440 nm) due to transitions from the 4f65d1 to the 4f7 configuration of the Eu2+ ion. Nd3+ ion doping in the phosphor results in long afterglow phosphorescence when the excitation light is cut off.
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