초록

플라스틱 기판을 이용한 고분자 청색 유기발광다이오드를 제작하였다. 청색 인광 도판트인 FIrpic을 도핑하여 용액공정으로 코팅한 PVK를 정공수송발광층으로 사용하였다. 소자 구조는 ITO/PVK:FIrpic (50 nm, xwt%)/TAZ 50 nm)/LiF (0.5 nm)/Al (100 nm)이다. FIrpic을 1 wt%~10 wt%까지 농도별로 도핑하여 실험을 하였는데, FIrpic 5 wt%일 때 18 cd/A의 최대전류효율을 보였다.

Abstract

We have fabricated blue phosphorescent organic light-emitting devices (OLEDs) on a plastic substrate. The solution coated poly (9-vinylcarbazole) (PVK) host doped with Bis (3,5-difluoro-2-(2-pyridyl)phenyl_(2-carboxypyridyl)irdium(III) (FIrPic) guest molecules was used as an hole transporting emission layer. The device structure was ITO/PVK:FIrpic (50 nm, xwt%)/TAZ 50nm)/LiF (0.5 nm)/Al (100 nm). The concentration of FIrpic molecule was varied from 1 wt% to 10 wt%. The OLED on plastic substrate exhibited maximum current efficiency of 18 cd/A with 5 wt% FIrpic molecules were doped into the PVK layer.

• Keywords: OLED, Flexible, Plastic, substrate, Polymer