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Fabrication of planar lighting devices utilizing Cs3Sb flat emitters
정효수 水原大學校 2018 論文集 Vol.32 No.-
Non-vacuum process technology was used to produce Cs3Sb photocathodes on substrates, and in-situ panel devices were fabricated. The performance of the devices was characterized by measuring the anode current as functions of the devices’operation times. An excitation light source with a 475-nm wavelength was used for the photocathodes. The device has a simple diode structure, providing unique characteristics such as a large gap, vertical electron beam directionality, and resistance to surface contamination from ion bombardment and poisoning by outgassing species. Accordingly, Cs3Sb photocathodes function as flat emitters, and the emission properties of the photocathode emitters depend on the vacuum level of the devices. An improved current stability has been observed after conducting an electrical conditioning process to remove possible adsorbates on the Cs3Sb flat emitters.
Fabrication of a planar UV lighting device utilizing Cs3Sb emitters
정효수 水原大學校 2017 論文集 Vol.31 No.-
Planar UV light sources with uniform intensity are ideal for UV treatments. A newly conceived planar UV lighting device utilizing Cs3Sb mono-alkali antimonide photocathodes as flat electron emitters is here presented and analyzed. The design concept involves a panel device that utilizes photocathodes operated in a reflection mode with an external excitation light source. The excitation light source is in the blue visible light range. Commercially available UV phosphors are used as a light source of desirable UV wavelengths. The light emission characteristics of the device are investigated by measuring the optical parameters as functions of applied anode voltages. The UV light emission shows that cold UV light with the spectral characteristics of near-monochromatic distribution are most effective. It also demonstrates that the UV intensity is sufficient for the UV treatment. More importantly, the planar UV lighting device is mercury free. These make them suitable for all UV applications.
정효수 水原大學校 2014 論文集 Vol.28 No.-
상압에서 제조된 포토캐소드(photocathode)를 이용하여 진공소자를 제작하였다. 발광을 위하여 양극기판에 R, G, B 형광체를 도포하였다. 제작된 진공 발광소자에 전압을 인가하여 밝기, 소모전력, 효율 등 발광특성 및 성능을 평가하였다. 전압인가 방식으로는 전류제한이 없는 high power mode와 전류를 제한하는 low power mode를 적용하였다. 전자방출을 유발하는 광원으로는 가시광 영역인 450 nm의 청색 LED 면광원을 사용하였다. 상압에서 제작된 포토캐소드는 전자방출 특성에서 높은 전류밀도와 장기적인 안전성을 나타내었다. 일반적인 포토캐소드 제조와 비교할 때 제작공정이 단순하여 저렴하게 제작할 수 있고, 선택적인 가시광영역의 광원에 감지도가 좋은 특성을 그대로 나타내었다. 제작된 면발광소자는 전압인가 방식에 따라 밝기, 전력소모, 효율 등에서 분명한 차이를 나타내었다. 이것은 응용분야에 적합한 밝기와 전력소모, 효율 등을 선택할 수 있다는 것을 의미한다. 측정된 값은 광원으로 사용하기에 충분한 평가지표를 나타내었다. 따라서 포토캐소드 면발광소자는 일반광원뿐만 아니라 UV 면광원과 같은 첨단 광원개발에 응용될 수 있을 것으로 보인다. 또한, 포토캐소드의 상압 공정기술은 전자원 뿐만 아니라 일반적인 전자소자에도 응용할 수 있을 것으로 보인다.
Luminous Properties of Planar Lighting Devices Using Cs3Sb Photocathodes
정효수 水原大學校 2015 論文集 Vol.29 No.-
The Cs3Sbphotocathodewasformedby non-vacuum process technology and successive in-situ photocathode vacuum device fabrication was carried out in a process chamber. Performance test of the device was followed. Light emission from the devices was induced by photoemitted electrons, accelerated by an anode electric field that was shielded from the photoemitter surface. The luminescent characteristics of the devices were investigated by measuring the optical parameters as functions of applied anode voltages. The results showed the possibility to produce a more directable and easily controllable stream of light. These make the devices suitable for a variety of planar lighting applications.
소아에서 Fogarty 카테터를 이용한 일측폐 환기 마취 경험
유수봉,강효석,임지훈,김두식,류시정 고신대학교의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.3
Thoracic surgery may be greatly facilitated by causing selective atelectasis of the lung being operated on (one-lung ventilation anesthesia). But the tube used for one-lung ventilation is greater outer diameter than conventional endotracheal tube when compare to each other with same inner diameter, so in some young children it is impossible to one-lung ventilation using double lumen tube or bronchial blocker tube because of narrow vocal cord. We performed one lung ventilation anesthesia using conventional endotracheal tube and Fogarty catheter as a bronchial blocker in 11-year old women who received lung biopsy surgery and left lower lobectomy.
Optical Properties of Planar Lighting
정효수 水原大學校 2016 論文集 Vol.30 No.-
This paper presents a concept for a planar light source utilizing Cs3Sb as flat electron emitters. The design concept of the devices with a diode structure was that the photocathodes were to be operated in a reflective mode. Commercially available P-22 phosphors were used as a light source of desirable wavelengths. Light emission from the devices was induced by photoemitted electrons, accelerated by an anode electric field that was shielded from the photoemitter surface. The optical properties of the devices were investigated by measuring the optical parameters as functions of applied anode voltages. The results showed the possibility to produce a more directable and easily controllable stream of light. These make the devices suitable for a variety of planar lighting applications.