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발광층에 2파장 재료를 갖는 백색 유기발광소자의 특성분석
강명구(Myung-Koo Kang),심주용(Ju-Yong Shim),오환술(Hwan-Sool Oh) 대한전자공학회 2008 電子工學會論文誌 IE (Industry electronics) Vol.45 No.1
본 연구에서는 발광층에 2 파장 재료를 갖는 백색 유기발광소자를 진공증착법을 사용하여 청색 발광재료인 NPB와 황색 발광재료인 Rubrene을 사용하여 제작하였다. 제작된 소자는 ITO/NPB(200Å)/NPB:Rubrene(300Å)/BCP(100Å)/Alq₃(100Å)/Al(1000Å) 구조로 하였고 Rubrene의 도핑농도는 0.75 wt%이었다. 소자의 색좌표값은 인가전압 11 V에서 x = 0.3327, y = 0.3387 로 NTSC 색좌표 순수한 백색영역(x = 0.3333, y = 0.3333)에 근접한 순수한 백색에 가까운 값을 얻었고, 이 때 최대 발광파장은 560 ㎚이었다. 소자의 동작 개시전압은 1 V이하이고 발광 개시전압은 4 V이다. 최대 외부양자효율은 인가전압 18.5 V, 전류밀도 369 ㎃/㎠ 일 때 0.457 %를 얻었다. In this paper, the white organic LED with two-wavelength was fabricated using the NPB of blue emitting material and a series of orange color fluorescent dye(Rubrene) by vacuum evaporation processes. The structure of white OLED was ITO/NPB(200Å)/NPB:Rubrene(300Å)/BCP(100Å)/Alq₃(100Å)/Al(1000Å) and the doping concentration of Rubrene was 0.75 wt% . We obtained the white OLED with CIE color coordinates were x=0.3327 and y=0.3387, and the maximum EL wavelength of the fabricated white organic light-emitting device was 560 ㎚ at applied voltage of 11 V, which was similar to NTSC white color with CIE color coordinates of x=0.3333 and y=0.3333. The turn-on voltage is 1 V, the light-emitting turn-on voltage is 4 V. We were able to obtain an excellent maximum external quantum efficiency of 0.457 % at an applied voltage of 18.5 V and current density of 369 ㎃/㎠.
김중연,강성종,로병규,강명구,오환술,Kim, Jung-Yeoun,Kang, Seong-Jong,Roh, Byeong-Gyu,Kang, Myung-Koo,Oh, Hwan-Sool 대한전자공학회 2002 電子工學會論文誌 IE (Industry electronics) Vol.39 No.2
In this paper, single-layer white organic light emitting device was fabricated on ITO glass substrate using PVK as host, Bu-PBD as electron transport layer, Nile Red, Coumarin 6, TPB as red, green, blue color fluorescent dyes. The red, green, blue organic light emitting devices were fabricated respectively. After the characteristic analysis of each color device, the white organic light emitting device was fabricated with optimized condition of each color device by spin coating method. we obtained white emission CIE coordination of (0.32, 0.34) and luminescence of 785cd/$m^2$ at driving voltage of 20V with condition of PVK(70wt%), Bu-PBD(30wt%), Nile Red(0.015mol%), Coumarin 6(0.04mol%), TPB(3mol%).? 본 논문은 백색유기발광소자를 구현하기 위해서 빛의 3원색인 적, 녹, 청색의 형광색소를 적절하게 배합하여 단일층 백색광을 얻었다. 개별적인 적색, 녹색, 청색 유기고분자 발광소자의 성능이 가장 우수한 특성을 조사한 후 최적화된 값으로 백색유기발광소자를 제작하였다. PVK와 Bu-PBD를 각각 70wt%, 30wt%로 혼합한 용액에 Nile Red(0.015mol%), Coumarin6(0.04mol%), TPB(3mol%)를 각각 첨가하여 백색발광소자를 제작하였을 때 구동전압이 20V에서 휘도 785cd/$m^2$, 색좌표가 (0.32, 0.34)인 백색광을 얻었다
MOCVD법에 의한 광 통신용 1.55㎛ PBH-DFB 레이저 다이오드 제작
오환술,김중연,전현성,강명구 건국대학교 산업기술연구원 1997 건국기술연구논문지 Vol.22 No.-
DC-PBHDFB LD operating at 1.55㎛ were fabricated by 3-step MOCVD process. The first-order grating with 2370Å period and 700Å etching depth was formed by holographic lithography and wet etching. Fabricated DCPBH-DFB LD operates in single longitudinal mode with side-mode suppression of more than 35dB and the lasing wavelength of 1.547㎛ at room temperature and 5mW, and the lasing threshold current and the slope efficiency were 15.6mA and 0.15mW/mA, respectively. The characteristic temperature of threshold current(To) and the temperature dependence of the lasing wavelength were obtained 57.3K and 1.0Å/℃ from the DFB laser between 20℃ and 70℃, respectively.