GDI 602/Rubrene을 이용한 황색 OLED의 제작과 특성 분석

Fabrication and Characterization of Yellow OLED using GDI602:Rubrene(10%) Material

GDI602:Rubrene(10%) 형광 시스템을 이용하여 황색 발광 OLED를 제작하고 그 특성을 평가하였다. 소자 제작에서 ITO/glass 위에 정공 주입층으로 2-TNATA[4,4',4'-tris(2-naphthylphenyl-phenyl-amino)-triphenylamine]를, 정공 수송층으로 NPB[N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl-4,4-diamine]를 진공 증착하였다. 황색 발광층으로는 GDI602를 호스트로, Rubrene를 도펀트로 사용하였다. 또한, 전자 수송층으로는 Alq₃를, 전자 주입층으로는 LiF를 사용하여 ITO/2-TNATA/NPB/GDI602:Rubrene(10%)/Alq₃/LiF/Al 구조의 저분자 OLED를 제작하였다. 본 실험에서 제작된 황색 OLED는 562nm의 중심 발광 파장을 가지며, CIE(0.50, 0.49) 색순도, 그리고 10V의 동작전압에서 2300Cd/m² 휘도와 0.7 lm/W의 전력 효율을 나타내었다.

The yellow emitting OLED using GDI602:Rubrene(10%) material has been fabricated and characterized. In the device fabrication, 2-TNATA [4,4',4'-tris(2-naphthylphenyl-phenylamino)-triphenyl-amine] as a hole injection material and NPB[N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-biphenyl -4,4'-diamine] as a hole transport material were deposited on the ITO(indium thin oxide)/glass substrate by vacuum evaporation. And then, yellow emission material was deposited using GDI602 as a host material and Rubrene(10%) as a dopant. Finally, small molecular OLED with the structure of ITO/2-TNATA/NPB/GDI602:Rubrene(10%)/Alq₃/LiF/Al was obtained by in-situ successive deposition of Alq₃, LiF and Al as the electron transport material, electron injection material and cathode. The yellow OLED fabricated in our experiments showed the color coordinate of CIE(0.50, 0.49), the luminance of 2300Cd/m² and the power efficiency of 0.7 lm/W at 10 V with the peak emission wavelength of 562 nm.