In this study, green barium strontium silicate phosphor (BaSrSiO4:Eu3+, Eu2+) was synthesized using a solid-statereaction method in air and reducing atmosphere. Investigation of the firing temperature indicates that a single phase of BaSrSiO4is formed when the firing temperature is higher than 1400oC. The effect of firing temperature and doping concentration onluminescent properties are investigated. The light-emitting property was the best when the molar content of Eu2O3 was 0.025mol. Also, the luminescent brightness of the BaSrSiO4 fluorescent substance was the best when the particle size of the bariumwas 0.5µm. BaSrSiO4 phosphors exhibit the typical green luminescent properties of Eu3+ and Eu2+. The characteristics of thesynthesized BaSrSiO4:Eu3+, Eu2+ phosphor were investigated using X-ray diffraction (XRD) and scanning electron microscopy.The maximum emission band of the BaSrSiO4:Eu3+, Eu2+ was 520nm.

The effect of BaF2 flux in Y3Al5O12:Ce3+(YAG:Ce) formation was investigated. Phase transformation ofY3Al5O12(YAG) was characterized by using XRD, SEM, and TEM-EDS, and it was revealed that the sequential formation ofthe Y4Al2O9(YAM), YAlO3(YAP) and Y3Al5O12(YAG) in the temperature range of 1000-1500oC. Single phase of YAG wasrevealed from 1300oC. In order to find out the effect of BaF2 flux, three modeling experiments between starting materials(1.5Al2O3−2.5Y2O3, Y2O3−BaF2, and Al2O3−BaF2) were done. These modeling experiments showed that the nucleationprocess occurs via the dissolution-precipitation mechanism, whereas the grain growth process is controlled via the liquid-phasediffusion route. YAG:Ce phosphor particles prepared using a proposed technique exhibit a spherical shape, high crystallinity,and an emission intensity. According to the experimental results conducted in this investigation, 5% of BaF2 was the bestconcentration for physical, chemical and optical properties of Y3Al5O12:Ce3+(YAG:Ce) that is approximately 10-15% greaterthan that of commercial phosphor powder.

[ Zn2(1-x)MnxSiO4 ]0.07≤x≤0.15) green phosphor was prepared by solid state reaction. The first heating was at 900˚C-1250˚C in air for 3 hours and the second heating was at 900˚C in N2/H2(95%/5%) for 2 hours. The size effect of SiO2 in forming Zn2SiO4 was investigated. The temperature for obtaining single phase Zn2SiO4 was lowered from 1100˚C to 1000˚C by decreasing the SiO2 particle size from micro size to submicro size. The effect of the activators for the Photoluminescence (PL) intensity of Zn2SiO4:Mn2+ was also investigated. The PL intensity properties of the phosphors were investigated under vacuum ultraviolet excitation (147 nm). The emission spectrum peak was between 520 nm and 530 nm, which was involved in green emission area. MnCl2·4H2O, the activator source, was more effective in providing high emission intensity than MnCO3. The optimum conditions for the best optical properties of Zn2SiO4:Mn2+ were at x = 0.11 and 1100˚C. In these conditions, the phosphor particle shape was well dispersed spherical and its size was 200 nm.

Dermorphin is a hepta peptide(H-Tyr-DAla-Phe-Gly-Tyr-Pro-Ser-NH2)with exceptionally potent and long-lasting peripheral and central activity. Dermorphin analogues, dermorphionyl(DMP)-Lys-NH2 and DMP-Lys-Lys-NH2 have been prepared in order to examine the effect of opiod activity. Dermorphin analogues were synthesized by the solid phase method. The crude peptide was purified by gel filter on a Sephadex LH-20, characterized with HPLC and amino acid analyzer. Analgesic potency was estimated by writhing syndrome method and Randall-Selitto method. As a result, dermorphin analogues have lower potency than that of morphine.

본 연구의 목적은 기존의 고상 반응법을 이용하여 일본의 상용 Zn2SiO4:Mn형광체보다 우수한 성능의 형광체를 제조하는데 있다. 이틀 위해 본 연구에서는 고상 반응법을 이용하여 Zn2SiO4:Mn 형광체를 합성하고, 이를 PDP(Plasma Display Panel)에 적용하기 위하여 소성온도 및 환원 온도와 주입되는 기체의 양, dopant Mn의 농도를 다양하게 하여 합성하였고, ball milling 등을 통하여 입자의 특성을 개선하는 실험을 하였다. 제조된 형광체의 발광특성 및 모양 등의 특성은 상용 Zn2SiO4:Mn 형광체와 비교하였다. Mn의 농도를 0.08mo1e로 하여 1300˚C에서 소성하였을 때 결정성 및 휘도가 가장 우수하였고, 환원시 5% H2-96% N, 혼합가스의 양을 100ml/rnin으로 일정하게 주입시켰을 때 20%이상 휘도가 증가하였다. Ball rnilling은 30분 동안 100rpm으로 하였을 때 입자의 크기가 수십 μm에서 3μm이하로 줄어들었다. 특히. 발광 특성이 상용 형광체보다 월등히 우수하여 PDP에 적용할 수 있다