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Ba<sub>2</sub>Mg(PO<sub>4</sub>)<sub>2</sub>:Eu 형광체의 합성과 자외선 여기하의 발광특성
태세원,정하균,최성호,허남회,Tae, Se-Won,Jung, Ha-Kyun,Choi, Sung-Ho,Hur, Nam-Hwi 한국재료학회 2008 한국재료학회지 Vol.18 No.11
For possible applications as luminescent materials for white-light emission using UV-LEDs, $Ba_2Mg(PO_4)_2:Eu^{2+}$ phosphors were prepared by a solid state reaction. The photoluminescence properties of the phosphor were investigated under ultraviolet ray (UV) excitation. The prepared phosphor powders were characterized to from a single phase of a monoclinic crystalline structure by a powder X-ray diffraction analysis. In the photoluminescence spectra, the $Ba_2Mg(PO_4)_2:Eu^{2+}$ phosphor showed an intense emission band centered at the 584 nm wavelength due to the f-d transition of the $Eu^{2+}$ activator. The optimum concentration of $Eu^{2+}$ activator in the $Ba_2Mg(PO_4)_2$ host, indicating the maximum emission intensity under the excitation of a 395 nm wavelength, was 5 at%. In addition, it was confirmed that the $Eu^{2+}$ ions are substituted at both $Ba^{2+}$ sites in the $Ba_2Mg(PO_4)_2$ crystal. On the other hand, the critical distance of energy transfer between $Eu^{2+}$ ions in the $Ba_2Mg(PO_4)_2$ host was evaluated to be approximately 19.3 A. With increasing temperature, the emission intensity of the $Ba_2Mg(PO_4)_2$:Eu phosphor was considerably decreased and the central wavelength of the emission peak was shifted toward a short wavelength.
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1차원 구조를 갖는 Thiophoshates, $Al_2NiP_2S_6$ (A=Rb, Cs)의 합성, 구조 및 자기적 성질
동용관,이건수,윤호섭,허남회,Dong, Yong Kwan,Lee, Kun Soo,Yun, Ho Seop,Hur, Nam Hwi 대한화학회 2001 대한화학회지 Vol.45 No.3
The quaternary thiophosphates, $A_2NiP_2S_6$ (A=Rb, Cs), have been synthesized with halide fluxes and structurally characterized by single-crystal X-ray diffraction technique. These compounds crystallize in the space group $C_{2h}^5-P2_1/n$ of the monoclinic system with two formula units in a cell of dimensions a=5.960(2), b=12.323(4), $c=7.491(3)\AA$, $\beta=97.05(3)^{\circ}$, and $V=546.0(3)\AA^3$ for Rb2NiP2S6 and a=5.957(4), b=12.696(7), $c=7.679(4)\AA$, $b=93.60(5)^{\circ}$, and $V=579.7(5)\AA^3$ for $Cs_2NiP_2S_6.$ These compounds are isostructural. The structure of $Cs_2NiP_2S_6$ is made up of one-dimensional $_\infty^1[NiP_2S_6^{2-}]$ chains along the a axis and these chains are isolated by $Cs^+$ ions. The Ni atom is octahedrally coordinated by six S atoms. These Ni$S_6$ octahedral units are linked by sharing three m-S atoms of the $[P_2S_6^{4-}]$ anions to form the infinite one-dimensional $_\infty^1[NiP_2S_6^{2-}]$ chain. For $Cs_2NiP_2S_6$, the magnetic susceptibility reveals an antiferromagnetic exchange interaction below 8K,which corresponds to the Neel temperature ($T_N$). Above $T_N$, this compound obeys Curie-Weiss law. The magnetic moment, C, and ${\theta}forCs_2NiP_2S_6$ are 2.77 B.M., 0.9593 K, and -19.02 K, respectively. The effective magnetic moment obtained from the magnetic data is agreed with the spin-only value of $Ni^{2+}d^8$(2.83 B.M.) system. 사성분계 thiophosphates, $A_2NiP_2S_6>(A=Rb$, Cs)를 halide fluxes 법으로 합성하였으며 단결정 X-ray 회절방법으로 결정 구조를 해석하였다. 이 화합물들을 $C_{2h}^5-P2_1/n$ 의 공간군을 가지며, $Rb_2NiP_2S_6$의 경우 a=5.960(2), b=12.323(4), $c=7.491(3)\AA$, $\beta=97.05(3)^{\circ}$, $V=546.0(3)\AA^3$이고$Cs_2NiP_2S_6$의 경우 a=5.957(4),b=12.696(7), $c=7.679(4)\AA$, $\beta=93.60(5)^{\circ}$, $V=579.7(5)\AA^3$인 격자상수를 갖는다. 이 두화합물은 동일한 결정 구조를 갖는다. 이들의 구조는 결정학적인 a축을 따라 성장한 1차원적인 무한사슬 $_{\infty}^1[NiP_2S_6^{2-}]$로 구성되어 있으며 이 사슬들은 알칼리 금속과의 정전기적 인력을 통하여 안정화 되어있다. Ni원자는 6개의 S원자에 의해 팔면체 배위를 하고 있고, Ni$S_6$팔면체는 $[P_2S_6^{4-}]$ 음이온 3개의 $\mu-S$ 원자들에 의해 연결되어 무한 1차원적인 사슬을 형성한다. $Cs_2NiP_2S_6$에 대한 자화율 측정결과 Neel temperature($T_N$)에 상응하는 8K 이하에서 superexchange를 통한 반자기성 magnetic coupling을 발견하였다. $T_N$이상의 온도에서는 Curie-Weiss법칙을 따른다. 자기 모멘트, C(Curie), 그리고 $\theta$(Weiss Constant)는 각각 2.77 B.M., 0.9593K, 그리고 -19.02K 이다. 측정 결과로부터 얻은 유효 자기 모멘트는 spin-only $Ni^{2+}d^8$(2.83 B.M.)계의 결과와 일치한다.
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서한복(Han-Bok Seo),이동준(Dongjun Lee),한송이(Song Yee Han),허남회(Nam Hwi Hur),이승엽(Seung-Yop Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Many researches on artificially fabricated photonic crystal structures has been developed in various fields. Recently, a great attention has been paid on the coloring technology mimicking the structural colors of the living organisms such as Morpho butterfly and peacock. However, previously developed methods have limitations to fabricate 3-dimensional photonic crystals in large scales without defection. In this paper, we propose a new fabrication method for the large-scale photonic crystal structures generating structural colors by improving and combining the dip coating and capillary methods.
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실리카 나노 입자를 이용한 자기조립 패턴 및 구조색 연구
서한복(Han Bok Seo),김경업(Kyungeop Kim),신부현(Bu Hyun Shin),김미현(Mi Hyun Kim),허남회(Nam Hwi Hur),이승엽(Seung-Yop Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Recently, the structural color by photonic crystal structures has been studied in various fields such as displays and sensors. Various manufacturing methods to compose the photonic crystal structures has been actively proposed. In this paper, we propose a self-assemble manufacturing process using the lifting devices and silica nano-particles on the surface of the glass substrate. The self-assembled manufacturing process using silica nano-particles in solution is based on wet self-assembly which has been developed widely. But the wet self-assembly method has the disadvantage in manufacturing of large scale and complex geometric patterns because of non-uniform surface, difficulty of thickness control and cracks. Therefore, the precise control of the lifting speed, density of silica nano-particles, external temperature and humidity are needed in experiments. We implement various experiments to determine the key factors to gain uniform surface, controllable thickness and defect-free photonic crystal structures. In addition, we measure the wavelength using spectrometer to determine the relationship of the silica nano-particle size of manufactured samples, comparing it to the theoretical wavelength of the structural color.
ScienceON
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