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이성훈,손명식 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.1
In this paper, 5.8GHz 25W microwave wireless power transmission system was developed. The transmission system is composed of a signal generator, a 1W drive amplifier, a 25W power amplifier, and a circularly polarized transmission antenna. The receiving system was fabricated with an integrated receiver that combines a circularly polarized receiving antenna, a pass band filter, and an RF-DC converter. And a multi-integrated receiver had twelve parts, including an integrated receiver. Under the conditions, voltage and current were measured for the system at 5cm intervals from a minimum distance of 5cm to a maximum distance of 80cm. The power was calculated for the system. The results of the system are shown in tables and graphs. The power decreases with distance, but the power does not drop sharply due to a multi-integrated receiver.
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고연색 LED용 적색 Sr<sub>2</sub>Si<sub>5</sub>N<sub>8</sub>:Eu<sup>2+</sup> 형광체의 합성 및 발광특성 연구
이성훈,김종수,강태욱,류종호,이상남,Lee, Sung Hoon,Kim, Jong Su,Kang, Tae Wook,Ryu, Jong Ho,Lee, Sang Nam 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.4
Red phosphors, $Sr_2Si_5N_8:Eu^{2+}$, were synthesized as a single-phase crystal structure by optimizing carbon and $Eu^{2+}$ contents in a carbothermal reduction nitridation method. With increasing $Eu^{2+}$ contents, the photoluminescence spectra were red-shifted from 600 nm peak for 1 mol% for to 700 nm for 7 mol%. It was suggested that this red shift is attributed to the energy transfer from one low-energy sited $Eu^{2+}$ (1) to other high-energy sited $Eu^{2+}$ (2). Finally, the best red sample (620 nm emission peak and 80 nm half width for 3 mole% of $Eu^{2+}$) was packaged on a Blue LED together with two additional green and yellow phosphors, the fabricated White LED showed a high color-rendering index of 90 and white color coordinates of x= 0.321 and y = 0.305.
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백색 LED용 Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> 형광체 크기 효과 및 광 시뮬레이션
이성훈,강태욱,김종수,Lee, Sung Hoon,Kang, Tae Wook,Kim, Jong Su 한국반도체디스플레이기술학회 2019 반도체디스플레이기술학회지 Vol.18 No.1
In this study, we synthesized two $Y_3Al_5O_{12}:Ce^{3+}$ phosphors ($7{\mu}m$-sized and $2{\mu}m$-sized YAG) with different sizes by controlling particles sizes of starting materials of the phosphors for white LED. In the smaller one ($2{\mu}m$-sized YAG), its photoluminescence intensity in the reflective mode was 63 % that of the bigger one ($7{\mu}m$-sized YAG); the quantum efficiencies were 93 % and 70 % for the smaller and the bigger ones. Two kinds of white LED packages with the same color coordinates were fabricated with a blue package (chip size $53{\times}30$) and two phosphors. The luminous flux of the white LED package with the smaller YAG phosphor was 92 % of that with the bigger one, indicating that the quantum efficiency of phosphor dispersed inside LED package was higher than that of the pure powder. It was consistently confirmed by the optical simulation (LightTools 6.3). It is notable according to the optical simulation that the white LED with the smaller phosphor showed 24 % higher luminous efficiency. If the smaller one had the same quantum efficiency as the bigger one (~93 %). Therefore, it can be suggested that the higher luminous efficiency of white LED can be possible by reducing the particle size of the phosphor along with maintaining its similar quantum efficiency.
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5.8 GHz 마이크로파 무선전력전송을 위한 BPF의 설계 및 구현
이성훈,손명식 한국반도체디스플레이기술학회 2015 반도체디스플레이기술학회지 Vol.14 No.4
In this paper, we have designed and fabricated a BPF (Band Pass Filter) for 5.8 GHz Microwave Wireless Power Transmission. We usedλg/2 open-circuited stubs in addition to T-shaped transmission lines for the BPF. This BPF removes harmonics caused by diodes of RF-DC converter, and thus the RF-DC converter converts more RF power to the DC. The performance of the BPF was measured and shown through direct comparison of voltages converted by the doubler as a RF-DC Converter with and without the BPF.
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5.8 GHz 마이크로파 무선전력전송을 위한 RF-DC 변환기의 설계 및 구현
이성훈,손명식 한국반도체디스플레이기술학회 2015 반도체디스플레이기술학회지 Vol.14 No.4
We have designed and fabricated two different RF-DC Converters called doubler for 5.8GHz Microwave Wireless Power Transmission. The doubler as RF-DC Converter makes the rectified voltage be doubled. We measured and compared voltages of the doublers with those of the previous full-wave rectifying RF-DC Converter. The doublers show rectified double voltages. However, the full-wave rectifying converter has a high efficiency due to the suppression of reflecting harmonics. The other fabricated doublers causes so many harmonics that they can’t convert the low-power RF to the full DC. In this paper, we show that the different doublers doesn’t double the rectifying voltages compared with those of the full-wave rectifying converter and give a reason about that.
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