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Ultra Wide Band-gap 인광체를 이용한 백색 OLED의 발광 특성
천현동,나현석,추동철,강유석,양재웅,주성후,Chun, Hyun-Dong,Na, Hyunseok,Choo, Dong Chul,Kang, Eu-Seok,Yang, Jae-Woong,Ju, Sung-Hoo 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.11
We studied the emission characteristics of white phosphorescent organic light-emitting diodes (PHOLEDs), which were fabricated using a two-wavelength method. The best blue emitting OLED and red emitting OLED characteristics were obtained at a concentration of 12 vol.% FIrpic and 1 vol.% $Bt_2Ir$(acac) in UGH3, respectively. And the optimum thickness of the total emitting layer was 25 nm. To optimize emission characteristics of white PHOLEDs, white PHOLEDs with red/blue/red, blue/red, red/blue and co-doping emitting layer structures were fabricated using a host-dopant system. In case of white PHOLEDs with co-doping structure, the best efficiency was obtained at a structure UGH3: 12 vol. % FIrpic: 1 vol.% $Bt_2Ir$(acac) (25 nm). The maximum brightness, current efficiency, power efficiency, external quantum efficiency, and CIE (x, y) coordinate were 13,430 $cd/m^2$, 40.5 cd/A, 25.3 lm/W, 17 % and (0.49, 0.47) at 1,000 $cd/m^2$, respectively.
직장 Dieulafoy양 병변 출혈의 내시경적 치료 1예
김성수,박호성,최규용,이강문,정인식,이창돈,한석원,한원희,추영미,채현석 대한소화기내시경학회 2000 Clinical Endoscopy Vol.21 No.1
Dieulafoy-like lesion is a relatively uncommon disease which is a potential source of life-threatening gastrointestinal bleeding. The lesion comprises mainly of an abnormally large submucosal artery that protrudes through a small mucosal defect. The lesion is frequently found at distal portion of gastroesophageal junction but may occur anywhere in gastrointestinal tract including small bowel, colon and rectum. Moreover bleeding from dieulafoy-like lesion of rectum is very reae. It has been reported that rectal Dieulafoy-like lesion is very rare source of lower gastrointestinal bleeding and its pathogenesis may be associated with constipation. Recently, endoscopy has an important role in the diagnosis and treatment (including injection and coagulation therapy) of bleeding from Dieulafoy-like lesion. We herein report a case of a patient who presented wih massive hemorrhage from a small rectal ulcer with adherent blood clots. Bleeding was controlled with endoscopic treatment by utilizing bipolar electrocoagulation without complication and recurrence.