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Gd<sup>3+</sup>/Li<sup>+</sup> 부활성제가 첨가된 구형의 Zn<sub>2</sub>SiO<sub>4</sub>:Mn 형광체 입자
노현숙,이창희,윤호신,강윤찬,박희동,박승빈,Roh, Hyun Sook,Lee, Chang Hee,Yoon, Ho Shin,Kang, Yun Chan,Park, Hee Dong,Park, Seung Bin 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
PDP(Plasma Display Panel)용 녹색 형광체인 $Zn_2SiO_4:Mn$ 형광체의 제조에 있어 콜로이드 분무 열분해법을 도입하고, $Zn_2SiO_4$ wellimite 결정의 $Si^{4+}$ 자리를 치환하는 $Gd^{3+}/Li^+$ 부활성제를 첨가하여 형광체의 발광특성을 향상시키고자 하였다. 14 nm 크기의 fumed silica 입자를 규소 전구체로 도입한 콜로이드 분무열분해법에 의해서 제조되어진 $Zn_2SiO_4:Mn$ 입자는 응집이 없는 구형의 형상, 작은 입자 크기 및 좁은 입도 분포를 가졌다. $Gd^{3+}/Li^+$ 함량은 $Zn_2SiO_4:Mn$ 형광체 입자의 발광특성에 영향을 끼쳤으며, 적정한 함량의 $Gd^{3+}/Li^+$ 부활성제를 첨가함으로써 진공 자외선하에서 형광체의 발광휘도를 향상시키고, 잔광시간을 크게 줄일 수 있었다. 분무 열분해법에 의한 $Gd^{3+}/Li^+$이 코도핑된 $Zn_2SiO_4:Mn$ 형광체 입자의 제조에 있어서 후열처리 온도는 형광체의 발광특성을 결정짓는 주요한 인자이다. 0.1 mol%의 $Gd^{3+}/Li^+$ 부활제를 포함하고 $1,145^{\circ}C$ 온도에서 소결된 $Zn_2SiO_4:Mn$ 형광체 입자는 상업용 형광체에 비해 5% 높은 발광 휘도과 5.7 ms의 잔광시간을 가졌다. Green-emitting $Zn_2SiO_4:Mn$ phosphors for PDP(Plasma Display Panel) application were synthesized by colloidal seed-assisted spray pyrolysis process. The codoping with $Gd^{3+}/Li^+$, which replaces $Si^{4+}$ site in the willemite structure, was performed to improve the luminous properties of the $Zn_2SiO_4:Mn$ phosphors. The particles prepared by spray pyrolysis process using fumed silica colloidal solution had a spherical shape, small particle size, narrow size distribution, and non-aggregation characteristics. The $Gd^{3+}/Li^+$ codoping amount affected the luminous characteristics of $Zn_2SiO_4:Mn$ phosphors. The codoping with proper amounts of $Gd^{3+}/Li^+$ improved both the photoluminescence efficiency and decay time of $Zn_2SiO_4:Mn$ phosphor particles. In spray pyrolysis, the post-treatment temperature is another factor controlling the luminous performance of $Zn_2SiO_4:Mn$ phosphors. The $Zn_{1.9}SiO_4:Mn_{0.1}$ phosphor particles containing 0.1 mol% $Gd^{3+}/Li^+$ co-dopant had a 5% higher PL intensity than the commercial product and 5.7 ms decay time after post-treatment at $1,145^{\circ}C$.
분체공학 유동층 재료 ( 무기 , 유기 , 고분자 ) : 분무열분해법에서 LiCl 융제가 Gd2O3 : Eu 형광체 분말의 특성에 미치는 영향
노현숙(Hyun Sook Roh),강윤찬(Yun Chan Kang),박승빈(Seung Bin Park) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.2
Gd₂O₃: Eu phosphor particles of high brightness were directly prepared at 900℃ by spray pyrolysis with LiCl as flux. The Gd₂O₃: Eu particles prepared from solution with LiCl flux had higher PL(photoluminescence) intensities than those prepared from solution without flux. The particles prepared from solution with 20 wt% LiCl had the highest PL intensity, which was 250% of that of particles prepared from solution without LiCl flux. In the spray pyrolysis, the flux acts as promotor of the growth of crystallite and activation of doping material, as in the solid state reaction method. Additionally, the flux improved PL intensity of Gd₂O₃: Eu phosphor particles by densifying the internal structure and eliminating the defect existing inside and surface of Gd₂O₃: Eu phosphor particles.
분체공학, 유동층, 고분자, 재료(무기, 유기) : Gd3+/Li+ 부활성제가 첨가된 구형의 Zn2SiO4:Mn 형광체 입자
노현숙 ( Hyun Sook Roh ),이창희 ( Chang Hee Lee ),유호신 ( Ho Shin Yoon ),강윤찬 ( Yun Chan Kang ),박희동 ( Hee Dong Pakr ),박승빈 ( Seung Bin Park ) 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6
Green-emitting Zn_2SiO_4:Mn phosphors for PDP(Plasma Display Panel) application were synthesized by colloidal seed-assisted spray pyrolysis process. The codoping with Gd^3+/Li^+, which replaces Si^4+ site in the willemite structure, was performed to improve the luminous properties of the Zn_2SiO_4:Mn phosphors. The particles prepared by spray pyrolysis process using fumed silica colloidal solution had a spherical shpae, small particle size, narrow size distribution, and non-aggregation characteristics. The Gd^3+/Li^+ codoping amount affected the luminous characteristics of Zn_2SiO_4:Mn phosphors. The codoping with proper amounts of Gd^3+/Li^+ improved both the photoluminescerce efficiency and decay time of Zn_2SiO_4:Mn phosphor particles. In spray pyrolysis, the post-treatment temperature is another factor controlling the luminous performance of Zn_2SiO_4:Mn phosphors. The Zn_1.9SiO_4:Mn_0.1 phosphor particles containing 0.1㏖% Gd^3+/Li^+ co-dopant had a 5% higher PL intensity than the commercial product and 5.7㎳ decay time after post-treatment at 1,145℃.
분체공학 유동충 재료 ( 무기 , 유기 , 고분자 ) : 구형의 형태를 가지는 푸른색 발광 BAM 형광체
강윤찬(Yun Chan Kang),노현숙(Hyun Sook Roh),박승빈(Seung Bin Park) 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.6
The blue emitting BAM phosphor particles with various compositions were prepared by the spray pyrolysis. The effect of composition on the morphology of BAM particles was investigated. In the case of BaMgAl_(10)O_(22):Eu^(2+), the morphology of particles with sphericity and non-aggregation characteristics disappeared after post-treatment at 1,400 ℃ for 3 hrs. On the other hand, the other composition particles except BaMgAl_(10)O_(22):Eu^(2+) maintained their original morphology after posttreatment, even if the particles were prepared at low temperatures in the spray pyrolysis. The BAM particles with MgAl₂O₄as intermediate material at low post-treatment temperature had high thermal stability and maintained sphericity of particles after post-treatment. The BAM particles had submicron size and narrow size distribution before and after post-treatment. All the samples had main emission peak at 450 ㎚, which corresponds to blue emission. The optimum post-treatment temperature of BAM : Eu²+ particles for the maximum PL(photoluminescence) intensity in the spray pylolysis was 1,400 ℃ because of high crystallinity, phase-purity, and good morphology.
박창걸(Park chang kirl),한혁(Hahn hyuk),노현숙(Roh hyun sook) 한국콘텐츠학회 2007 한국콘텐츠학회 종합학술대회 논문집 Vol.5 No.2_1
계속기업을 전제로 하는 기업들은 꾸준히 새로운 사업을 탐색과 투자로 사업화를 모색한다. 그러나, 일반적으로 그 성공확률은 매우 낮아 R&D과제의 사업화 성공확률이 1/3,000에 불과하다고 한다. 따라서, 기업에서 사업다각화의 일환으로 새로운 사업에 진출한다는 것은 높은 위험을 감수해야만 하는 경영자의 중대한 의사결정 사항이다. 특히, 기업활동의 제반 역량이 대기업에 비해 열악한 중소기업들의 경우에는 높은 위험에 대한 부담으로 새로운 사업분야로의 도전에 적극적으로 대처하기 어려운 것이 사실이다. 본 연구는 중소기업과 중소기업 정책 입안자 들에게 중소기업형 유망 선도업종을 발굴하는 접근방법론과 적용 결과를 제시함으로써 체계적인 사업 및 R&D 기획을 위한 정보를 제공하고자 하였다. All of enterprises are diversifying it's business items for going concern. But it is very difficult to find a successful business items because they should be in front of various risk factors. Especially the small and middle enterprises are inferior to the large enterprises in every way likes technology development, marketing and human resources etc. So, it can be a decisive decision making to branch out to them. Because they should concentrate their resources for it. This research introduce systematic approach of the decision of famous business items for small and middle enterprises.