• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.25 no.5
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• pp.381-386
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• 2012

To study encapsulation method for large-area organic light emitting diodes (OLEDs), red emitting OLEDs were fabricated, on which $Alq_3$ as organic buffer layer and LiF and Al as inorganic protective layers were deposited to protect the damage of OLED by epoxy. And then the OLEDs were attached to flat glass by printing method using epoxy. The basic structure of OLED doped with rubrene of 1 vol.% as emitting layer is ITO(150 nm) / 2-TNATA(50 nm) / ${\alpha}$-NPD(30 nm) / $Alq_3$:Rubrene(30 nm) / $Alq_3$(30 nm) / LiF(0.7 nm) / Al(100 nm). In case of depositing $Alq_3$, LiF and Al and then attaching of flat glass onto OLED, current density, luminance, efficiency and driving voltage were not changed and lifetime was increased according to thickness of Al as inorganic protective layers. The lifetime of OLED/$Alq_3$/LiF/Al_4/glass structure was 139 hours increased by 15.8 times more than bare OLED of 8.8 hours and 1.6 times more than edge sealed OLED of 54.5 hours.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.24 no.11
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• pp.905-910
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• 2011

To study encapsulation method for large-area organic light emitting diodes (OLEDs), red emitting OLEDs were fabricated, on which LiF and Al were deposited as inorganic protective films. And then the OLED was attached to flat glass by printing method using epoxy. In case of direct coating of epoxy onto OLED by printing method, luminance and current efficiency were remarkably decreased because of the damage to the OLED by epoxy. In case of depositing LiF and Al as inorganic protective films and then coating of epoxy onto OLED, luminance and current efficiency were not changed. OLED lifetime was more increased through inorganic protective films between OLED and flat glass than that without any encapsulation (8.8 h), i.e., 47 (LiF/Al/epoxy/glass), 62 (LiF/Al/LiF/epoxy/glass), and 84 h (LiF/Al/Al/epoxy/glass). The characteristics of OLED encapsulated with inorganic protective films (attached to flat glass) showed the possibility of application of protective films.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.594-595
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• 2007

RFID(Radio Frequency IDentification)는 사물에 ID태그를 부착하여 정보를 제공하는 것을 기능으로 하여 점차적으로 센싱 기능을 추가하여 발전하고 있다. 본 연구에서는 배전 공가설비인 통신케이블을 관리하기 위하여 RFID를 이용하여 감시 및 순시 정보를 기록, 관리하며 봉인을 위한 지그비 센서태그를 이용하여 무단으로 설치되는 통신케이블을 실시간으로 감시할 수 있는 공가관리시스템을 구현하였다. 570만 전주에 달하는 공가설비를 관리하는 것은 안정적인 전력 공급을 위하여서도 필요하며 공가설비 관리의 IT화를 도모하여 RFID 비즈니스 모델로 활용할 수 있을 것으로 기대된다. 본 연구에서는 이를 위해 전주나 통신케이블에 전자태그를 부착하여 RFID 미들웨어를 통해 데이터를 수집하고 정보시스템에 접속하여 실시간으로 공가시설물 정보를 취득할 수 있는 정보시스템을 구축함으로써 무단 공가설비 설치 감시 및 공가설비 순회 점검 결과를 관리할 수 있도록 데이터베이스에 반영하여 현장의 공가설비내역과 정보시스템의 데이터베이스를 동기화시켜 실시간으로 현황을 파악할 수 있도록 개발하였다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.26 no.7
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• pp.539-544
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• 2013

To study the encapsulation method for heat dissipation of high brightness organic light emitting diode (OLED), red emitting OLED of ITO (150 nm) / 2-TNATA (50 nm) / NPB (30 nm) / $Alq_3$ : 1 vol.% Rubrene (30 nm) / $Alq_3$ (30 nm) / LiF (0.7 nm) / Al (200 nm) structure was fabricated, which on $Alq_3$ (150 nm) / LiF (150 nm) as buffer layer and Al as protective layer was deposited to protect the damage of OLED, and subsequently it was encapsulated using attaching film and metal sheet. The current density, luminance and power efficiency was improved according to thickness of Al protective layer. The emission spectrum and the Commission International de L'Eclairage (CIE) coordinate did not have any effects on encapsulation process using attaching film and metal sheet The lifetime of encapsulated OLED using attaching film and metal sheet was 307 hours in 1,200 nm Al thickness, which was increased according to thickness of Al protective layer, and was improved 7% compared with 287 hours, lifetime of encapsulated OLED using attaching film and flat glass. As a result, it showed the improved current density, luminance, power efficiency and the long lifetime, because the encapsulation method using attaching film and metal sheet could radiate the heat on OLED effectively.