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RF 마그네트론 스퍼터링법으로 증착한 ZnO:Er 박막형광체의 발광 특성
송현돈,김영진,Song, Hyun-Don,Kim, Young-Jin 한국재료학회 2006 한국재료학회지 Vol.16 No.7
ZnO is well-known as a promising material for optical communication systems and electronic displays. ZnO:Er thin films were deposited on c-plane sapphire substrates by rf magnetron sputtering, and the effects of sputtering parameters and the annealing conditions on the luminescence in the visible range were investigated. Luminescent properties depended on the crystallinity of films and annealing atmosphere. Highly c-axis oriented ZnO:Er films showed a strong emission band at 465 nm and a weak emission at 525 nm due to the energy transition of $^{4}I_{15/2}-^{4}F_{5/2}\;and\;^{4}I_{15/2}-^{2}H_{11/2}$, respectively. ZnO:Er thin films annealed at air atmosphere were superior to those annealed in $H_2$ in photoluminescence intensity.
희토류계 Erbium을 도핑한 ZnO 형광체의 발광특성
송현돈,김영진,Song, Hyun-Don,Kim, Young-Jin 한국재료학회 2006 한국재료학회지 Vol.16 No.1
Effects of doping concentration and annealing atmosphere on the luminescent properties of $Er^{3+}$ doped ZnO phosphor powders were investigated. Photoluminescence (PL) spectra of ZnO:Er exhibit an orange emission band at around 575 nm, while those of pure ZnO show a green emission at 520 nm. Emission difference between ZnO:Er and pure ZnO is attributed to the energy transfer of Er ions in ZnO. The highest PL intensity is obtained by doping 1 mol% Er to ZnO. Luminescent properties of ZnO:Er phosphors annealed at $N_2$+vacuum atmosphere are superior to those annealed at $N_2$ atmosphere.
[Ca<sub>1-x</sub>Sr<sub>x</sub>Al<sub>2</sub>O<sub>4</sub>:Eu<sup>2+</sup>] 형광체의 상전이 및 발광특성에 관한 연구
박윤진,송현돈,정상현,이지희,황민하,김영진,Park, Yun-Jin,Song, Hyun-Don,Jung, Sang-Hyun,Lee, Jee-Hee,Hwang, Min-Ha,Kim, Young-Jin 한국재료학회 2008 한국재료학회지 Vol.18 No.1
The phase transformations and luminescent properties of Eu-doped $Ca_{1-x}Sr_xAl_2O_4$ phosphors were investigated. $Ca_{1-x}Sr_xAl_2O_4:Eu^{2+}$ phosphors were synthesized by a solid-state reaction with a flux, $H_3BO_3$. A phase transformation from monoclinic $CaAl_2O_4$ to monoclinic $SrAl_2O_4$ was observed as the x values increased. A high-temperature hexagonal phase of $SrAl_2O_4$ was formed during this transformation as an intermediate phase under an $H_2$ atmosphere due to oxygen vacancies; this did not occur in an air atmosphere. Accordingly, the emission spectra shifted from a blue region to a green region as x increased.
n-표면 거칠기가 형성된 AlGaInP 수직형 적색 발광다이오드의 광추출효율 증가
서재원,오화섭,송현돈,박경욱,유성욱,박영호,박해성,곽준섭,Seo, Jae-Won,Oh, Hwa-Sub,Song, Hyun-Don,Park, Kyung-Wook,Ryu, Seong-Wook,Park, Yung-Ho,Park, Hae-Sung,Kwak, Joon-Seop 한국진공학회 2008 Applied Science and Convergence Technology Vol.17 No.4
AlGaInP 기반 수직형 적색 LED (Light Emitting Diode)의 광추출효율을 증가시키기 위하여 화학적 etching 기술을 이용하여 n-AlGaInP 표면에 삼각꼴 모양의 거칠기를 형성하였다. Etching은 $H_3PO_4$계의 용액을 이용하여 화학적 etching을 진행 하였다. AlGaInP etching은 광추출효율의 증가와 밀접한 관련을 갖고 있으며 AFM (Atomic Force Microscope)을 이용하여 AlGaInP 표면을 분석하여 약 44 nm의 RMS (root-mean-square) 거칠기가 형성됨을 알 수 있었다. 광추출효율은 기존 수직형 적색 LED보다 거칠기가 형성된 수직형 적색 LED에서 41%의 높은 발광 효율을 보임으로써 고효율 수직형 적색 LED의 가능성을 보였다. In order to increase extraction efficiency of AlGaInP-based vertical RED LEDs, chemical wet etching technique was produced by using a roughened surface with triangle-like morphology. A commonly used $H_3PO_4$-based solution was applied for chemical wet etching. The light extraction of AlGaInP LED was related to the n-side roughed surface morphology. The morphology of roughed surface is analyzed by the atomic force microscope (AFM). As a result, the roughed surface AlGaInP LED has a root-mean-square (RMS) roughness of 44 nm. The brightness shows 41% increase after roughening n-side surface, as compared to the ordinary flat surface LED.
Jae Won Seo,Hwa Sub Oh,송현돈,Kyung Wook Park,Duk Hyun Park,Seong Wook Ryu,Young Ho Park,곽준섭 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
In this study, we investigated the effect of n-side roughness on the light extraction efficiency of vertical AlGaInP-based light-emitting diodes (LEDs). Chemical wet etching using a H3PO4-based solution was applied to the n-side AlGaInP surface. A uniform triangle-like shape was produced on the n-AlGaInP surface after the chemical wet etch. The luminous intensity of the AlGaInPbased LEDs with n-side roughness shown to be much higher than that of the LEDs without n-side roughness
실버스포츠이벤트 후원 기업에 대한 브랜드태도가 기업이미지 및 구매행동에 미치는 영향
이태용 ( Tae Yong Lee ),조송현 ( Song Hyeon Cho ),이상돈 ( Sang Don Lee ) 한국스포츠산업경영학회 2010 한국스포츠산업경영학회지 Vol.15 No.6
이 연구는 스폰서십 효과, 스폰서 선호도와 브랜드태도의 관계, 브랜드태도와 기업이미지의 관계, 기업이미지와 구매행동의 관계를 하나의 모형으로 구성하여 실버스포츠이벤트 후원의 효과를 종합적으로 규명하는데 그 목적을 두었다. 연구대상은 제3 회 KB국민은행 전국게이트볼대회 본선 참가자를 모집단으로 선정하였으며, 유의표집법(purposeful sampling method)을 통해, 대회 본선에 오른 300명을 표집 추출하였으며, 이중 276명의 유효 표본을 자료 분석에 이용하였다. 확인적 요인분석과 신뢰도 분석을 실시하였으며, 연구모형의 적합도는 구조방정식모형을 통해 분석하였다. 이상의 연구수행 과정을 통해 도출된 결과는 다음과 같다. 첫째, 이미지제고는 브랜드태도에 긍정적인 영향을 미친다. 둘째, 신뢰획득은 브랜드태도에 긍정적인 영향을 미 친다. 셋째, 브랜드태도는 사회공헌이미지에 긍정적인 영향을 미친다. 넷째, 브랜드태도는 기업이미지에 긍정적인 영향을 미친 다. 다섯째, 사회공헌이미지는 구매의도에 긍정적인 영향을 미친다. 여섯째, 사회공헌이미지는 구전의도에 긍정적인 영향을 미 친다. 일곱째, 기업우수이미지는 구매의도에 긍정적인 영향을 미친다. 여덟째, 기업우수이미지는 구전의도에 긍정적인 영향을 미친다. This study is to delve into the relationship between the effect of sponsorship & the preference for sponsor and brand attitude, the relationship between the company image and the brand attitude and the relationship between the company image and the purchase behavior. We selected the participants who took part in the 3rd National Gate Ball Sponsored by KB Kookmin Bank as a population and took out 300 persons as a sample through Purposeful Sampling Method. Among them, we used the effective sample data of 276 persons for the analysis of data. In order to achieve the objective of the study, when it comes to the analysis of data used in this study: 1. the improvement of image has a positive effect on the brand attitude. 2. the achievement of reliability has a positive effect on the brand attitude. 3. the brand attitude has a positive effect on the company image to give a contribution to the society. 4. the brand attitude has a positive effect on the company image. 5. the company to give a contribution to the society has a positive effect on the intention of the purchase. 6. the company to give a contribution to the society has a positive effect on the intention of word of mouth. 7. the excellent company image has a positive effect on the intention of the purchase. 8. the excellent company image has a positive effect on the intention of word of mouth.