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분무열분해법에 의해 합성된 장파장 자외선용 할로포스페이트계 형광체의 특성
손종락,강윤찬,박희동,윤순길,Sohn, Jong-Rak,Kang, Yun-Chan,Park, Hee-Dong,Yoon, Soon-Gil 한국재료학회 2002 한국재료학회지 Vol.12 No.7
Blue-emitting $Sr_{10}$($PO$)$_{6}$ $Cl_2$:$Eu^{2+}$ and $_{(Sr,Mg) }$ 10/($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ phosphor particles for application of long-wavelength UV LED were prepared by ultrasonic spray pyrolysis. The luminescence characteristics under long- wave-length ultraviolet of the $Sr_{10}$ ($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ and (Sr,Mg)$_{10}$ ($PO_4$)$_{6}$ $Cl_2$:$^Eu{2+}$ phosphor particles prepared by the spray pyrolysis were compared with that of the commercial product. The PL intensity of the $Sr_{10}$ ($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ particles prepared by the spray pyrolysis was lower than that of the commercial $Sr_{10}$ ($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ particles because prepared $Sr_{10}$ ($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ phosphor particles had porous structure and hollow morphology. However, the PL intensity of the (Sr,Mg)$_{10}$($PO_4$)$_{6}$ $Cl_2$:$Eu^{2+}$ phosphor particles prepared by the spray pyrolysis was 8% higher than that of the commercial one. The high brightness of $(Sr,Mg)_{10}$ ($PO_4$)$_{6}$ $Cl_2$:Eu$^{2+}$ phosphor particles prepared by spray pyrolysis is due to the dense structure and high crystallinity of particles. The $(Sr,Mg)<_{10}$ ($PO_4$)$_{6}$ /$Cl_2$:$Eu^{ 2+}$ phosphor particles had main emission peak t 448 nm under long- wavelength ultraviolet.
共沈澱法에 依하여 調製한 酸化 Nickel-Silica系 觸媒의 Ethylene 二量化
孫宗洛 慶北大學校 1978 論文集 Vol.25-26 No.-
共沈澱方法에 依하여 酸化 nickel-silica觸媒를 調製하여 ethylene 二重化活性을 硏究하였다. ethylene二重化에 대한 酸化 nickel-silica의 活性은 脫水에 依한 것으로 증명되었다. 低溫의 眞空處理에 있어서는 觸媒의 活性點이 Bro¨nsted酸이었으나, 高溫의 경우에는 活性點이 Lewis酸이었다. 또한 觸媒의 活性能은 觸媒의 表面積과 酸化 nickel의 量에 依存되었다. The nickel oxide-silica catalysts were prepared by coprecipitation method and their activities of ethylene dimerization were studied by the conventional static apparatus. The activation of nickel oxide-silica for ethylene dimerization was proved to be due to the dehydration of catalyst. It was shown that the active site for dimerization was Bro¨nsted acid for the lower evacuation temperature but was Lewis acid for the higher evacuation temperature. The activity of catalyst was dependant on the specific surface area and nickel oxide % in the catalyst.