ITO/Glass 기판위에 PFO-poss 유기 발광층을 가지는 고분자 발광다이오드의 제작
Preparation of Polymer Light Emitting Diodes with PFO-poss Organic Emission Layer on ITO/Glass Substrates
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초록
ITO(Indium tin oxide)/glass 기판 위에 PEDOT:PSS[poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)]와 PVK[poly(N-vinyl carbazole)] 고분자 물질을 정공 주입 및 수송층으로, 발광층으로 PFO-poss[Poly(9,9-dioctylfluorenyl-2,7-diyl) end capped with poss]를 사용하여 ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al 구조의 고분자 발광다이오드를 제작하였다. 이때 스핀코팅을 위한 발광 유기재료의 농도와 열처리 온도가 소자의 전기적, 광학적 특성에 미치는 영향을 조사하였다. 동일한 PFO-poss 농도에서 열처리 온도가 100℃에서 200℃로 증가할 경우 PLED 소자의 전류밀도와 휘도특성이 증가하는 경향을 나타내었다. 1.0 wt% 농도를 갖는 PFO-poss 유기물 발광층을 200℃ 온도로 열처리 할 경우 958 cd/m2의 최대 휘도를 나타내었으며 발광파장은 523 nm 녹색계통의 파장이 크게 증가하여 청백색에 가까운 발광을 나타내었다. PFO-poss 농도증가(0.5 wt%에서 1.0 wt%)와 함께 PLED 소자의 열처리 온도를 100℃에서 200℃로 증가할 경우 CIE 색좌표는 청색 (x, y = 0.17, 0.14) 에서 청백색 (x, y = 0.29, 0.41) 발광으로 천이하는 경향을 나타내었다.
Abstract
: Polymer light emitting diodes (PLEDs) with ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al structures were prepared by the spin coating method on ITO(indium tin oxide)/glass substrates. PFO-poss[Poly(9,9-dioctylfluorenyl-2,7-diyl) end capped with poss] was used as light emitting polymer. PVK[poly(N-vinyl carbazole)] and PEDOT:PSS [poly(3,4-ethylenedioxythiophene):poly(styrene sulfolnate)] polymers were used as the hole injection and transport materials. The effect of PFO-poss concentration and the heating temperatures on the electrical and optical properties of the devices were investigated. At the same concentration of PFO-poss solution, the current density and luminance of PLED device tend to increase as the annealing temperature increase from 100C to 200C. The maximum luminance was found to be about 958 cd/m2 at 13V for the PLED device with 1.0 wt% PFO-poss at the annealing temperature of 200C. In addition, the PLED device showed bluish white emission through the strong greenish peak with 523nm in wavelength. As the concentration of PFO-poss increase from 0.5 wt% to 1.0 wt% and temperature of PLEDs increase from 100C to 200C, the emission color tend to be shifted from blue with (x, y) = (0.17,0.14) to bluish white with (x, y) = (0.29,0.41) in CIE color coordinate.
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