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유기 전계 발광 소자(OELD) 개발을 위한 PVK 박막의 특성 연구
河潤卿,魯碩源 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
Organic-based electroluminescent devices have attracted lots of interests because of their possible applications as large-area flat panel display. The devices that were used in this study were fabricated with poly(9-vinylcarbazole)(PVK) of two different molecular weights. The molecular weights of PVK for the devices were 58,600 and 1,100,000. UV/vis absorption peaks of both PVK films appeared at 296, 330,344nm. PL spectra and EL spectra of both PVK films showed the same pattern around 420nm. Thickness of both PVK films was determinad. For both PVK films, as increased coating rpm, thickness decreased. The film thickness decreased exponentially. Thickness of 1,100,000 PVK was higher than that of 58,600 PVK.
河潤卿,魯碩原 弘益大學校 科學技術硏究所 1999 科學技術硏究論文集 Vol.10 No.1
2,4,6-Triphenyl-1,3,5-Triazine (TRZ) has been used as a hole blocking material for electroluminescent device(ELD)[4]. The EL devices of the four layer structure, ITO/hole transporting layer(HTL)/emitting layer/Al, were fabricated. TRZ was doped into the poly(n-vinylcarbazole)(PVK), which was spin-coated on indium tin oxide(ITO) film. The emitting layer, tris(8-hydroxyquinoline)aluminum(Alq₃), was deposited on top of PVK film. The ELD emits characteristic green color generated from Alq3 emitting layer. As the percentage of TRZ was increased, the efficiency of devices increased. The devices, which contained higher concentration of blocking material, were driven at a lower current under the same voltage. The optimum concentration of hole blocking material was 10wt%, which produced the highest ELD luminescence.