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허영덕,최은지 한국결정성장학회 2008 韓國結晶成長學會誌 Vol.18 No.5
CaMoO₄crystals with ellipsoid, peanut, dumbbell, and notched sphere shapes were synthesized using a simple precipitation reaction. The morphology of CaMoO₄crystals evolved from ellipsoids, through peanut-like structures and dumbbells, to notched spheres with increasing the concentration of Ca²+ and MoO₄²- ions. This morphology evolution of CaMoO₄crystals is attributed to a fractal mechanism. Branched crystal growth started at both ends of the ellipsoids. The peanut-like and dumbbell morphologies were formed by the first and second fractal growths, espectively. Finally, the notched spheres were formed by further fractal growth of dumbbells.
허영덕,성혜진,도영락,Heo, Yeong-Deok,Seong, Hye-Jin,Do, Yeong-Rak 대한화학회 2006 대한화학회지 Vol.50 No.6
series of Ca1-xSrxS:Ce phosphors were synthesized by solid-state reactions. The Ca1-xSrxS:Ce phosphors have a strong absorption in region from 430 nm to 470 nm. The emission peaks of CaS:Ce are located at 510 nm and 570 nm. The partial replacement of Ca by Sr in Ca1-xSrxS:Ce causes a blue shift of emission wavelengths. The Ca1-xSrxS:Ce can be used as bluish green and yellow emitting phosphors for white light emitting diodes (LEDs) pumped by the blue LED. We reported the optical properties of Ca1-xSrxS:Ce phosphors for application in phosphor converted white LEDs. Ca1-xSrxS:Ce 형광체를 고상법으로 합성하였다. Ca1-xSrxS:Ce 형광체는 430nm와 470nm 영역에서 강한 흡수가 있다. CaS:Ce은 510 nm와 570 nm에서 발광한다. Ca1-xSrxS:Ce에서 Ca이 Sr으로 치환되면 발광 파장은 단파장 이동을 한다. 청색 발광 다이오드를 사용하여 백색 발광 다이오드를 얻는데 Ca1-xSrxS:Ce 형광체는 푸른빛을 띤 녹색과 황색을 방출할 수 있는 형광체로 사용될 수 있다. 백색 발광 다이오드의 적용을 위한 Ca1-xSrxS:Ce 형광체의 광 특성을 확인하였다.
SrGa<sub>2</sub>S<sub>4</sub> 형광체의 합성과 발광 특성
허영덕,심재훈,도영락,Heo, Yeong-Deok,Sim, Jae-Hun,Do, Yeong-Rak 대한화학회 2002 대한화학회지 Vol.46 No.2
$SrGa_2S_4$:Eu는 녹색을 발광하는 형광체로 전계 방출 디스플레이, 음극선 발광 분야에 널리 응용되고 있다. 일반적으로 $SrGa_2S_4$:Eu의 합성은 $SrCO_3$,$Ga_2O_3$, 그리고 $Eu_2O_3$를 $H_2S$ 와 Ar 가스를 흘려주면서 고온에서 소송하는 고상반응법으로 합성하였다. 본 연구에서는 SrS, Eu 착물, 그리고 Ga 착물의 분해 반응을 통해서 $SrGa_2S_4$:Eu 형광체를 합성하였다. 이 방법의 장점은 Ar 가스 뿐 만 아니라 독성의 $H_2S$를 사용하지 않는 것이다. $SrGa_2S_4$:Eu 형광체의 합성 조건과 발광 특성을 검토하였다. SrGa$_2$S$_4$ : Eu is a green emitting phosphor which is applied for field emission display, and cathodoluminescence. Conventionally, SrGa$_2$S$_4$ : Eu is synthesized by solid state reaction, in which a mixture of SrCO$_3$, Ga$_2$O$_3$, and Eu$_2$O$_3$ is fired at high temperatures under flowing H$_2$S and Ar gases. In this study,SrGa$_2$S$_4$ : Eu phosphor is synthesized by using a decomposition method, where SrS, Eu complex, and Ga com-plex are used. The advantage of this method is that toxic H$_2$S gas and Ar gas are not used. The synthetic con-ditions and luminescent properties of SrGa$_2$S$_4$ : Eu phosphor are also investigated.
허영덕,정우찬 단국대학교 1996 論文集 Vol.30 No.-
Intercalation compound between a Phenol Red and a layered double hydroxide of Al and Zn (Zn - Al - PR LDH) was directly synthesized by the hydrolysis of ZnCl_2, AlCl_3, and the Phenol Red with a NaOH solution. From X-ray diffraction studies, the orientation of the intercalation species can be roughly estimated. The size of the Phenol Red was calculated by using Alchemy Program. The length of the Phenol Red is 11.98Å. The gallery height of the Zn - Al - PR LDH which is measured from the X-ray diffraction peaks is 12.35Å. Therefore, the Phenol Red lies nearly perpendicular to the hydroxide layers. The formula of the Zn - Al - PR LDH was checked by ICP-AES and C, H, N, S elemental analysis. As increasing the stoichiometric aluminum content, the percent contents of intercalated Phenol Red in the hydroxide layers decreases. Therefore, the interaction between the Phenol Red and a hydroxide layer is dependent upon the stoichiometric aluminum content.
허영덕,김지현,Huh, Young-Duk,Kim, Ji-Hyun 한국결정성장학회 2005 한국결정성장학회지 Vol.15 No.2
층상 구조의 유기-무기 페로브스카이트 복합 소재 $(C_nH_{2n+1}NH_3)_2CuC1_4$ (n=6, 8, 10, 12)을 합성하였다. $(C_nH_{2n+1}NH_3)_2CuC1_4$ 화합물에서 긴 사슬의 양성자화된 알킬 암모늄 이온은 기울어진 이중층의 구조로 $CuCl_6$ 팔면체의 구석을 공유하고 있는 페로브스카이트형의 층들 사이에의 삽입되었다. 페로브스카이트 층상 화합물에서의 3개의 고체상을 HT-XRD와 DSC를 사용하여 조사하였다. $(C_nH_{2n+1}NH_3)_2CuC1_4$ 화합물은 단계적인 층간거리의 증가와 함께 고체-고체 상전이 현상을 보여준다 3개의 다른 구조는 긴 사슬의 양성자화된 알킬 암모늄 이온의 형태 변화로 설명하였다. The layered structure of organic-inorganic perovskite hybrids, $(C_nH_{2n+1}NH_3)_2CuC1_4$ (n = 6, 8, 10, 12) have synthesized. In $(C_nH_{2n+1}NH_3)_2CuC1_4$ compounds, the long-chain protonated alkylammonium ions as tilted bilayer type are inserted into perovskite-type layers of corner sharing $CuCl_6$ octahedron. Three solid phases have been characterized in the perovskite layered compound $(C_nH_{2n+1}NH_3)_2CuC1_4$ using HT-XRD and DSC. The $(C_nH_{2n+1}NH_3)_2CuC1_4$ compounds shows solid-solid phase transitions with stepwise increasing of the layer distance. Three different structures are explained by the conformational change of the long-chain protonated alkylammonium ions.