Journal of Information Display

  • 제8권2호
  • /
  • Pages.20-24
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  • 2007
  • /
  • 1598-0316(pISSN)
  • /
  • 2158-1606(eISSN)
한국정보디스플레이학회 (The Korean Infomation Display Society)
권호 표지

White Organic Light-emitting Diodes using the Tandem Structure Incorporating with Organic p/n Junction

  • Lee, Hyun-Koo (School of Electrical Engineering and Computer Science and Inter-University Semiconductor Research Center, Seoul National University, Student Member, KIDS) ;
  • Kwon, Do-Sung (School of Electrical Engineering and Computer Science and Inter-University Semiconductor Research Center, Seoul National University, Student Member, KIDS) ;
  • Lee, Chang-Hee (School of Electrical Engineering and Computer Science and Inter-University Semiconductor Research Center, Seoul National University, Member, KIDS)
  • 발행 : 2007.06.24
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초록

Efficient white organic light-emitting diodes are fabricated with the blue and red electroluminescent (EL) units electrically connected in a stacked tandem structure by using a transparent doped organic p/n junction. The blue and red EL units consist of the light-emitting layer of 1,4-bis(2,2-diphenyl vinyl)benzene (DPVBi) and 4-dicyanomethylene-2-methyl-6-[2-(2,3,6,7-tetrahydro-1H,5H-benzo[i,j] quinolizin-8-yl)vinyl]-4H-pyran) (DCM2) doped tris(8-hydroxyquinoline) aluminum $(Alq_3)$, respectively. The organic p-n junction consists of ${\alpha}-NPD$ doped with $FeCl_3$ (15 % by weight ratio) and $Alq_3$ doped with Li (10 %). The EL spectra exhibit two peaks at 448 and 606 nm, resulting in white light-emission with the Commission Internationale d'Eclairage (CIE) chromaticity coordinates of (0.36, 0.24). The tandem device shows the quantum efficiency of about 2.2 % at a luminance of 100 $cd/m^2$, higher than individual blue and red EL devices.

키워드

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