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권석빈,김보영,최승희,유정현,김완호,김재필,정호정,박동준,강봉균,윤대호,송영현 한국물리학회 2020 Current Applied Physics Vol.20 No.11
In this study, the red-emitting phosphor-in-glass (PiG) using the CaAlSiN3: Eu2+ (CASN) phosphor is reported for the first time. The CASN: Eu2+ PiG samples with a maximum luminous flux of 25.1–29.4 for l minute at laser power of 1 W/mm2 was obtained using a low-temperature glass frit and GPS furnace. Despite the increase in the phosphor from 15 to 25 wt%, the PiG produced at low temperature of 380 ◦C showed robust properties. Finally, the red PiG module designed for rear lamp applications maintains over 90% lumens for a minute at 350 mA and achieves an intense red light having a color temperature of 4589 K.
권석빈,김보영,장인석,전시욱,김완호,정호정,김재필,정몽권,정병우,강봉균,윤대호,송영현 한국물리학회 2020 Current Applied Physics Vol.20 No.7
We report on the optimization of fabrication of a ceramic phosphor plate (CPP) using α-Al2O3 as functional materials for an automotive laser headlamp. The prepared CPP shows the high luminous characteristics with increasing α-Al2O3 contents because of the light scattering of the hexagonal structure of α-Al2O3 materials. We investigated the correlation between α-Al2O3 and thickness of CPP. The luminous properties of the CPP are improved and optimized according to the variables of one. We found that the prepared sample is a potential material for future solid-state laser lighting in application as an automotive headlamp.
자동차용 레이저 헤드램프를 위한 형광체 세라믹 제조 및 발광 특성 분석
최승희,권석빈,유정현,김재필,김완호,정호중,김보영,윤대호,송영현,Choi, Seung Hee,Kwon, Seok Bin,Yoo, Jung Hyeon,Kim, Jae Pil,Kim, Wan Ho,Jeong, Ho-Jung,Kim, Bo Young,Yoon, Dae Ho,Song, Young Hyun 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.2
본 연구에서는 차세대 자동차 레이저 헤드램프 적용을 위하여 분무건조법을 통하여 가넷 구조를 갖는 구형의 YAG : Ce 형광체를 합성하였으며 이를 기반으로 형광체 세라믹을 제조하고 광학적 특성을 분석하였다. 분무건조법 기반으로 합성된 구형의 YAG : Ce 형광체를 이용한 형광체 세라믹의 두께를 100 ㎛, 150 ㎛, 200 ㎛로 조절하여 두께에 따른 광변환 효율, 열 소광, 휘도 및 색온도의 광학적 특성을 비교하였다. 연구 결과, 양자효율 및 광속 값은 두께가 150 ㎛ 일 때, 가장 높게 나타났다. 본 연구 결과는 기존의 액상법을 기반으로 한 YAG : Ce 나노 형광체 제조의 고 비용, 저 수율 등의 문제점을 개선한 방법으로 향 후, 형광체 세라믹 제조에 큰 역할을 할 수 있을 것이라 기대된다. In this study, phosphor ceramics were fabricated, and optical properties were analyzed for application to nextgeneration automotive laser headlamps by using a spherical YAG : Ce phosphor with a garnet structure synthesized based on the spray drying method. The thickness of phosphor ceramic using spherical YAG : Ce phosphor was obtained with 100 ㎛, 150 ㎛, and 200 ㎛ to investigate the effect of thickness on optical properties such as light conversion efficiency, heat dissipation, luminance and color temperature. The results of this study are expected to play a significant role in the manufacturing process for the fabrication of phosphor ceramic by solving issues such as the high cost and low yield in the conventional liquid method to manufacture YAG : Ce nano fluorescent materials.
Homogeneous precipitation method를 통한 나노 YAG : Ce 형광체 합성과 광학 특성
이철우,권석빈,지은경,송영현,정병우,김은영,정몽권,윤대호,Lee, Chul Woo,Kwon, Seok Bin,Ji, Eun Kyung,Song, Young Hyun,Jeong, Byung Woo,Kim, Eun Young,Jung, Mong Kwon,Yoon, Dae-Ho 한국결정성장학회 2017 한국결정성장학회지 Vol.27 No.1
본 연구에서는 homogeneous precipitation method를 통하여 구형의 단분산(monodispersed) YAG : $Ce^{3+}$를 합성했다. 단분산 YAG : $Ce^{3+}$의 전구체를 합성하는 과정에서 aluminum ion들이 먼저 석출되어 aluminum 화합물을 형성하고 후에 yttrium 화합물들이 aluminum 화합물들의 표면에서 석출된다. 합성된 전구체를 파우더형태로 얻기 위해 건조과정을 거치는데, oven에서 건조했을 때 보다 동결건조기에서 건조했을 때 비교적 구형의 단분산 YAG : $Ce^{3+}$ 입자를 얻을 수 있었다. 하소 과정에서 공정을 진행하는 온도로서 $1100^{\circ}C$와 $1200^{\circ}C$를 비교해 보았다. 실험 결과 $1200^{\circ}C$의 온도로 상압에서 6시간 동안의 하소 과정을 진행하였을 때 400~500 nm 입자크기를 가진 단분산된 구형의 나노 YAG : $Ce^{3+}$ 입자가 합성되었다. In this study, spherical monodispersed cerium-doped yttrium aluminum garnet (YAG : $Ce^{3+}$) phosphor particles were synthesized via homogeneous precipitation method using the mixed solution of yttrium nitrate, cerium nitrate, aluminum nitrate, ammonium aluminum sulfate, and urea as a precipitant. During the process of precursors of monodispersed YAG : $Ce^{3+}$, aluminum ions which form spherical aluminum compounds precipitated first and yttrium compounds precipitated onto the surface of the existing spherical aluminum compounds. Drying process using lyophilization could obtain monodispered spherical YAG : $Ce^{3+}$ particles compare to using oven. The thermal calcination process of YAG : $Ce^{3+}$ precursors under the temperature of $1200^{\circ}C$ for 6 h was enough to obtain 400~500 nm sized YAG particles with pure YAG phase.
고효율 광전자 소자 응용을 위한 전 무기 할라이드 페로브스카이트 나노결정 합 성 및 필름 제작
최승희,김현빈,유정현,권석빈,정성국,송영현,윤대호,Choi, Seung Hee,Kim, Hyun Bin,Yoo, Jung Hyeon,Kwon, Seok Bin,Jeong, Seong Guk,Song, Young Hyun,Yoon, Dae Ho 한국결정성장학회 2018 한국결정성장학회지 Vol.28 No.3
할라이드 페로브스카이트 나노결정은 고색순도 및 우수한 발광특성을 바탕으로 LED 응용에 대한 연구가 활발히 진행되고 있다. 고온주입법을 통하여 $CsPbX_3$(X = I, Br, and Cl) 나노결정을 합성하였고 할로젠 이온의 조성 변화를 통하여 발광파장을 제어하였다. 고분자 바인더를 사용하여 녹색과 적색의 필름을 제작하였다. 합성된 나노결정 및 제작된 필름의 우수한 광특성을 확인하였고, 이를 InGaN 청색 LED칩에 적용하여 우수한 색영역의 wLED를 구현하였다. Halide perovskite nanocrystals have become attractive for LED applications due to their high color purity and excellent luminescent properties. $CsPbX_3$ (X = I, Br, and Cl) nanocrystals were synthesized by hot-injection method and the emission wavelength was controlled by changing the composition of halide ion. Green- and red-emitting films were fabricated using a polymer binder. The outstanding optical properties of the synthesized nanocrystals and fabricated films were confirmed. The wLED designed by green- and red-emitting perovskite nanocrystal films on blue InGaN LED was characterized.
Fabrication of polyaniline–carbon nano composite for application in sensitive flexible acid sensor
서창욱,윤여준,김도훈,최수연,박원규,유진선,백병민,권석빈,양철민,송영현,윤대호,양우석 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-
Many studies have been carried out on sensors for detecting hazardous chemicals. In this study, a sensorfor detecting the presence of acid was developed and evaluated. The sensor is composed of carbonmaterials and polyaniline, which is a conductive polymer. Various candidate carbon materials for thesensor were examined, including graphite, reduced graphene oxide (rGO), and graphene nanoplatelets(GNP). From characterization of carbon material-polyaniline and acid reaction test, it was confirmed thatthe GNP was the best carbon material for the acid sensor. For practical use, the GNP–polyanilinecomposite was coated on PET to enable aflexible sensor.