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고상반응법에 의해 제조된 Zn_2SiO_4:Mn 녹색 형광체의 발광 특성
박응석,장호정,허경무,조태환 단국대학교 신소재기술연구소 1997 신소재 Vol.7 No.-
MnO_2와 MNCO_3를 활성체로 사용하여 Zn_2SiO_4: Mn 녹색 형광체를 고상반응법에 의해 제조하고, 이들 시료에 대해 소결온도, 활성제 종류 및 농도에 따른 발광 특성 및 결정성 등을 조사 하였다. MnCO_3를 활성제로 사용한 형광체 시료의 경우, Mn의 도핑농도를 X=0.08(Zm_2-xMn_xSiO_4)로 첨가하여 1300℃에서 4시간 질소분위기에서 소결한 형광체 시료에서 최대 발광휘도 와 양호한 색순도를 나타내었다. 활성제로 MnO_2를 사용한 경우가 MnCO_3를 첨가한 경우보다 발광 스펙트럼강도가 떨어지는 경향을 보여 주었으며, 이 결과는 MnO_2 활성제의 경우 Mn의 부적절한 원자가에 기인하는 것으로 판단된다. SEM 관찰결과 형광체 분말의 입도 크기는 약 3∼6 ㎛를 나타내었다. We have prepared a good quality Zn_2SiO_4: Mn green phosphors using MnO_2 and MnCO_3 as activators by the solid state reaction method. The luminance properties and crystalline qualities were investigated as functions of the firing temperature and activator concentrations. In Zn_20xMn_2SiO_4, the phosphors doped with MnCO_3, Mn concentration of X=0.08 showed the highest intensity of emission spectra and good color purity at the firing temperature of 1300℃ for 4hrs under N_2 atmospher. At the same concentration and firing condition, the emission spectrum peaks of the phosphors doped with MnO_2 were lower than those of samples doped with MnCO_3. This may be due to the improper valence state of Mn cation. As Mn contents increased, the maximum of emission spectra shifted slightly toward higher wavelength. From the SEM micrograph, it was found that the phosphors were composed of small grains about 3∼6㎛.
활성제 종류에 따른 Zn2SiO4 : Mn 녹색 형광체의 발광 특성
조태환,장호정,박응석 한국공업화학회 1997 응용화학 Vol.1 No.2
We have been prepared a good quality Zn₂SiO₄:Mn phosphors using MnCO_3, MnO and MnO₂ as activators by the solid state reaction method. The luminance properties, color purity and crystalline qualities were investigated as a function of the firing temperature and activator concentrations. In the Mn doping range from 0.005 to 0.12(g-atom/㏖) in Zn₂SiO₄:Mn, the phosphors doped with Mn concentration of 0.08 (g-atom/㏖) showed the highest intensity of emission spectra and good color purity at the firing temperature of 1400℃ for 8hrs under air atmosphere. As the Mn contents increased, the maximum of emission spectra shifted slightly toward higher wavelength. From the SEM micrograph, it was found that the phosphors were composed of a great number of small grains about 1∼2㎛. The XRD analysis showed the typical rhombohedral crystal structures.